//
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// ZJContentView.m
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// ZJScrollPageView
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//
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// Created by jasnig on 16/5/6.
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// Copyright © 2016年 ZeroJ. All rights reserved.
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//
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#import "ZJContentView.h"
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@interface ZJContentView ()<UIScrollViewDelegate, UICollectionViewDelegate, UICollectionViewDataSource> {
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CGFloat _oldOffSetX;
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BOOL _isLoadFirstView;
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NSInteger _sysVersion;
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}
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@property (weak, nonatomic) ZJScrollSegmentView *segmentView;
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// 用于处理重用和内容的显示
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@property (strong, nonatomic) ZJCollectionView *collectionView;
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// collectionView的布局
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@property (strong, nonatomic) UICollectionViewFlowLayout *collectionViewLayout;
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// 父类 用于处理添加子控制器 使用weak避免循环引用
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@property (weak, nonatomic) UIViewController *parentViewController;
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// 当这个属性设置为YES的时候 就不用处理 scrollView滚动的计算
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@property (assign, nonatomic) BOOL forbidTouchToAdjustPosition;
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@property (assign, nonatomic) NSInteger itemsCount;
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// 所有的子控制器
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@property (strong, nonatomic) NSMutableDictionary<NSString *, UIViewController<ZJScrollPageViewChildVcDelegate> *> *childVcsDic;
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// 当前控制器
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@property (strong, nonatomic) UIViewController<ZJScrollPageViewChildVcDelegate> *currentChildVc;
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/// 如果类似cell缓存一样, 虽然创建的控制器少了, 但是每个页面每次都要重新加载数据, 否则显示的内容就会出错, 貌似还不如每个页面创建一个控制器好
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//@property (strong, nonatomic) NSCache *cacheChildVcs;
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@property (assign, nonatomic) NSInteger currentIndex;
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@property (assign, nonatomic) NSInteger oldIndex;
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// 是否需要手动管理生命周期方法的调用
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@property (assign, nonatomic) BOOL needManageLifeCycle;
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// 滚动超过页面(直接设置contentOffSet导致)
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@property (assign, nonatomic) BOOL scrollOverOnePage;
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@end
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@implementation ZJContentView
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#define cellID @"cellID"
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#pragma mark - life cycle
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- (instancetype)initWithFrame:(CGRect)frame segmentView:(ZJScrollSegmentView *)segmentView parentViewController:(UIViewController *)parentViewController delegate:(id<ZJScrollPageViewDelegate>) delegate {
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if (self = [super initWithFrame:frame]) {
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self.segmentView = segmentView;
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self.delegate = delegate;
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self.parentViewController = parentViewController;
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_needManageLifeCycle = ![parentViewController shouldAutomaticallyForwardAppearanceMethods];
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if (!_needManageLifeCycle) {
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#if DEBUG
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NSLog(@"\n请注意: 如果你希望所有的子控制器的view的系统生命周期方法被正确的调用\n请重写%@的'shouldAutomaticallyForwardAppearanceMethods'方法 并且返回NO\n当然如果你不做这个操作, 子控制器的生命周期方法将不会被正确的调用\n如果你仍然想利用子控制器的生命周期方法, 请使用'ZJScrollPageViewChildVcDelegate'提供的代理方法\n或者'ZJScrollPageViewDelegate'提供的代理方法", [parentViewController class]);
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#endif
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}
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[self commonInit];
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[self addSubview:self.collectionView];
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[self addNotification];
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}
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return self;
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}
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- (void)commonInit {
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_oldIndex = -1;
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_currentIndex = 0;
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_oldOffSetX = 0.0f;
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_forbidTouchToAdjustPosition = NO;
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_isLoadFirstView = YES;
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_sysVersion = [[[UIDevice currentDevice] systemVersion] integerValue];
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if ([_delegate respondsToSelector:@selector(numberOfChildViewControllers)]) {
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self.itemsCount = [_delegate numberOfChildViewControllers];
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}
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else {
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NSAssert(NO, @"必须实现的代理方法");
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}
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UINavigationController *navi = (UINavigationController *)self.parentViewController.parentViewController;
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if ([navi isKindOfClass:[UINavigationController class]]) {
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if (navi.viewControllers.count == 1) return;
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if (navi.interactivePopGestureRecognizer) {
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__weak typeof(self) weakSelf = self;
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[_collectionView setupScrollViewShouldBeginPanGestureHandler:^BOOL(ZJCollectionView *collectionView, UIPanGestureRecognizer *panGesture) {
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CGFloat transionX = [panGesture translationInView:panGesture.view].x;
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if (collectionView.contentOffset.x == 0 && transionX > 0) {
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navi.interactivePopGestureRecognizer.enabled = YES;
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}
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else {
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navi.interactivePopGestureRecognizer.enabled = NO;
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}
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if (weakSelf.delegate && [weakSelf.delegate respondsToSelector:@selector(scrollPageController:contentScrollView:shouldBeginPanGesture:)]) {
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return [weakSelf.delegate scrollPageController:weakSelf.parentViewController contentScrollView:collectionView shouldBeginPanGesture:panGesture];
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}
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else return YES;
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}];
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}
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}
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}
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- (void)addNotification {
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[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(receiveMemoryWarningHander:) name:UIApplicationDidReceiveMemoryWarningNotification object:nil];
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}
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- (void)receiveMemoryWarningHander:(NSNotificationCenter *)noti {
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__weak typeof(self) weakSelf = self;
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[_childVcsDic enumerateKeysAndObjectsUsingBlock:^(NSString * _Nonnull key, UIViewController<ZJScrollPageViewChildVcDelegate> * _Nonnull childVc, BOOL * _Nonnull stop) {
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__strong typeof(self) strongSelf = weakSelf;
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if (strongSelf) {
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if (childVc != strongSelf.currentChildVc) {
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[_childVcsDic removeObjectForKey:key];
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[ZJContentView removeChildVc:childVc];
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}
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}
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}];
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}
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- (void)layoutSubviews {
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[super layoutSubviews];
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if (self.currentChildVc) {
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self.currentChildVc.view.frame = self.bounds;
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}
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}
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- (void)dealloc {
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[[NSNotificationCenter defaultCenter] removeObserver:self];
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#if DEBUG
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NSLog(@"ZJContentView---销毁");
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#endif
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}
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// 处理当前子控制器的生命周期 : 已知问题, 当push的时候会被调用两次
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- (void)willMoveToWindow:(nullable UIWindow *)newWindow {
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[super willMoveToWindow:newWindow];
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if (newWindow == nil) {
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[self willDisappearWithIndex:_currentIndex];
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}
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else {
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[self willAppearWithIndex:_currentIndex];
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}
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}
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- (void)didMoveToWindow {
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[super didMoveToWindow];
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if (self.window == nil) {
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[self didDisappearWithIndex:_currentIndex];
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}
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else {
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[self didAppearWithIndex:_currentIndex];
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}
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}
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#pragma mark - public helper
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/** 给外界可以设置ContentOffSet的方法 */
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- (void)setContentOffSet:(CGPoint)offset animated:(BOOL)animated {
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self.forbidTouchToAdjustPosition = YES;
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NSInteger currentIndex = offset.x/self.collectionView.bounds.size.width;
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_oldIndex = _currentIndex;
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self.currentIndex = currentIndex;
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_scrollOverOnePage = NO;
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NSInteger page = labs(_currentIndex-_oldIndex);
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if (page>=2) {// 需要滚动两页以上的时候, 跳过中间页的动画
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_scrollOverOnePage = YES;
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}
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[self.collectionView setContentOffset:offset animated:animated];
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}
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/** 给外界刷新视图的方法 */
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- (void)reload {
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[self.childVcsDic enumerateKeysAndObjectsUsingBlock:^(NSString * _Nonnull key, UIViewController<ZJScrollPageViewChildVcDelegate> * _Nonnull childVc, BOOL * _Nonnull stop) {
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[ZJContentView removeChildVc:childVc];
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childVc = nil;
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}];
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self.childVcsDic = nil;
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[self commonInit];
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[self.collectionView reloadData];
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[self setContentOffSet:CGPointZero animated:NO];
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}
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+ (void)removeChildVc:(UIViewController *)childVc {
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[childVc willMoveToParentViewController:nil];
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[childVc.view removeFromSuperview];
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[childVc removeFromParentViewController];
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}
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#pragma mark - UIScrollViewDelegate
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- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
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if (self.forbidTouchToAdjustPosition || // 点击标题滚动
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scrollView.contentOffset.x <= 0 || // first or last
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scrollView.contentOffset.x >= scrollView.contentSize.width - scrollView.bounds.size.width) {
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return;
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}
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CGFloat tempProgress = scrollView.contentOffset.x / self.bounds.size.width;
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NSInteger tempIndex = tempProgress;
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CGFloat progress = tempProgress - floor(tempProgress);
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CGFloat deltaX = scrollView.contentOffset.x - _oldOffSetX;
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if (deltaX > 0) {// 向左
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if (progress == 0.0) {
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return;
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}
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self.currentIndex = tempIndex+1;
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self.oldIndex = tempIndex;
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}
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else if (deltaX < 0) {
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progress = 1.0 - progress;
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self.oldIndex = tempIndex+1;
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self.currentIndex = tempIndex;
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}
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else {
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return;
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}
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// NSLog(@"old ---- %ld current --- %ld", _oldIndex, _currentIndex);
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[self contentViewDidMoveFromIndex:_oldIndex toIndex:_currentIndex progress:progress];
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}
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/** 滚动减速完成时再更新title的位置 */
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- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView {
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NSInteger currentIndex = (scrollView.contentOffset.x / self.bounds.size.width);
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[self contentViewDidMoveFromIndex:currentIndex toIndex:currentIndex progress:1.0];
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// 调整title
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[self adjustSegmentTitleOffsetToCurrentIndex:currentIndex];
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}
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- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView {
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_oldOffSetX = scrollView.contentOffset.x;
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self.forbidTouchToAdjustPosition = NO;
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}
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- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate {
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UINavigationController *navi = (UINavigationController *)self.parentViewController.parentViewController;
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if ([navi isKindOfClass:[UINavigationController class]] && navi.interactivePopGestureRecognizer) {
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navi.interactivePopGestureRecognizer.enabled = YES;
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}
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}
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#pragma mark - private helper
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- (void)contentViewDidMoveFromIndex:(NSInteger)fromIndex toIndex:(NSInteger)toIndex progress:(CGFloat)progress {
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if(self.segmentView) {
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[self.segmentView adjustUIWithProgress:progress oldIndex:fromIndex currentIndex:toIndex];
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}
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}
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- (void)adjustSegmentTitleOffsetToCurrentIndex:(NSInteger)index {
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if(self.segmentView) {
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[self.segmentView adjustTitleOffSetToCurrentIndex:index];
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}
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}
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- (void)willAppearWithIndex:(NSInteger)index {
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UIViewController<ZJScrollPageViewChildVcDelegate> *controller = [self.childVcsDic valueForKey:[NSString stringWithFormat:@"%ld", index]];
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if (controller) {
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if ([controller respondsToSelector:@selector(zj_viewWillAppearForIndex:)]) {
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[controller zj_viewWillAppearForIndex:index];
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}
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if (_needManageLifeCycle) {
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[controller beginAppearanceTransition:YES animated:NO];
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}
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if (_delegate && [_delegate respondsToSelector:@selector(scrollPageController:childViewControllWillAppear:forIndex:)]) {
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[_delegate scrollPageController:self.parentViewController childViewControllWillAppear:controller forIndex:index];
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}
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}
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}
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- (void)didAppearWithIndex:(NSInteger)index {
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UIViewController<ZJScrollPageViewChildVcDelegate> *controller = [self.childVcsDic valueForKey:[NSString stringWithFormat:@"%ld", index]];
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if (controller) {
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if ([controller respondsToSelector:@selector(zj_viewDidAppearForIndex:)]) {
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[controller zj_viewDidAppearForIndex:index];
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}
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if (_needManageLifeCycle) {
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[controller endAppearanceTransition];
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}
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if (_delegate && [_delegate respondsToSelector:@selector(scrollPageController:childViewControllDidAppear:forIndex:)]) {
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[_delegate scrollPageController:self.parentViewController childViewControllDidAppear:controller forIndex:index];
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}
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}
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}
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- (void)willDisappearWithIndex:(NSInteger)index {
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UIViewController<ZJScrollPageViewChildVcDelegate> *controller = [self.childVcsDic valueForKey:[NSString stringWithFormat:@"%ld", index]];
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if (controller) {
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if ([controller respondsToSelector:@selector(zj_viewWillDisappearForIndex:)]) {
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[controller zj_viewWillDisappearForIndex:index];
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}
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if (_needManageLifeCycle) {
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[controller beginAppearanceTransition:NO animated:NO];
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}
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if (_delegate && [_delegate respondsToSelector:@selector(scrollPageController:childViewControllWillDisappear:forIndex:)]) {
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[_delegate scrollPageController:self.parentViewController childViewControllWillDisappear:controller forIndex:index];
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}
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}
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}
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- (void)didDisappearWithIndex:(NSInteger)index {
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UIViewController<ZJScrollPageViewChildVcDelegate> *controller = [self.childVcsDic valueForKey:[NSString stringWithFormat:@"%ld", index]];
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if (controller) {
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if ([controller respondsToSelector:@selector(zj_viewDidDisappearForIndex:)]) {
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[controller zj_viewDidDisappearForIndex:index];
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}
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if (_needManageLifeCycle) {
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[controller endAppearanceTransition];
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}
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if (_delegate && [_delegate respondsToSelector:@selector(scrollPageController:childViewControllDidDisappear:forIndex:)]) {
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[_delegate scrollPageController:self.parentViewController childViewControllDidDisappear:controller forIndex:index];
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}
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}
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}
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#pragma mark - UICollectionViewDelegate --- UICollectionViewDataSource
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- (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView {
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return 1;
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}
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- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
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return _itemsCount;
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}
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- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
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UICollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:cellID forIndexPath:indexPath];
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// 移除subviews 避免重用内容显示错误
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[cell.contentView.subviews makeObjectsPerformSelector:@selector(removeFromSuperview)];
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if (_sysVersion < 8) {
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[self setupChildVcForCell:cell atIndexPath:indexPath];
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}
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return cell;
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}
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- (void)setupChildVcForCell:(UICollectionViewCell *)cell atIndexPath:(NSIndexPath *)indexPath {
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if (_currentIndex != indexPath.row) {
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return; // 跳过中间的多页
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}
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_currentChildVc = [self.childVcsDic valueForKey:[NSString stringWithFormat:@"%ld", (long)indexPath.row]];
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BOOL isFirstLoaded = _currentChildVc == nil;
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if (_delegate && [_delegate respondsToSelector:@selector(childViewController:forIndex:)]) {
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if (_currentChildVc == nil) {
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_currentChildVc = [_delegate childViewController:nil forIndex:indexPath.row];
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if (!_currentChildVc || ![_currentChildVc conformsToProtocol:@protocol(ZJScrollPageViewChildVcDelegate)]) {
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NSAssert(NO, @"子控制器必须遵守ZJScrollPageViewChildVcDelegate协议");
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}
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// 设置当前下标
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_currentChildVc.zj_currentIndex = indexPath.row;
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[self.childVcsDic setValue:_currentChildVc forKey:[NSString stringWithFormat:@"%ld", (long)indexPath.row]];
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} else {
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[_delegate childViewController:_currentChildVc forIndex:indexPath.row];
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}
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} else {
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NSAssert(NO, @"必须设置代理和实现代理方法");
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}
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// 这里建立子控制器和父控制器的关系
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if ([_currentChildVc isKindOfClass:[UINavigationController class]]) {
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NSAssert(NO, @"不要添加UINavigationController包装后的子控制器");
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}
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if (_currentChildVc.zj_scrollViewController != self.parentViewController) {
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[self.parentViewController addChildViewController:_currentChildVc];
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}
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_currentChildVc.view.frame = cell.contentView.bounds;
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[cell.contentView addSubview:_currentChildVc.view];
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[_currentChildVc didMoveToParentViewController:self.parentViewController];
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// NSLog(@"当前的index:%ld", indexPath.row);
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if (_isLoadFirstView) { // 第一次加载cell? 不会调用endDisplayCell
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[self willAppearWithIndex:indexPath.row];
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if (isFirstLoaded) {
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// viewDidLoad
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if ([_currentChildVc respondsToSelector:@selector(zj_viewDidLoadForIndex:)]) {
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[_currentChildVc zj_viewDidLoadForIndex:indexPath.row];
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}
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}
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[self didAppearWithIndex:indexPath.row];
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_isLoadFirstView = NO;
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}
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else {
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[self willAppearWithIndex:indexPath.row];
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if (isFirstLoaded) {
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// viewDidLoad
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if ([_currentChildVc respondsToSelector:@selector(zj_viewDidLoadForIndex:)]) {
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[_currentChildVc zj_viewDidLoadForIndex:indexPath.row];
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}
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}
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[self willDisappearWithIndex:_oldIndex];
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}
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}
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- (void)collectionView:(UICollectionView *)collectionView willDisplayCell:(UICollectionViewCell *)cell forItemAtIndexPath:(NSIndexPath *)indexPath {
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// NSLog(@"出现出现:current:---- %ld old ----- %ld indexpathRow----%ld ", _currentIndex, _oldIndex, indexPath.row);
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if (_sysVersion >= 8) {
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[self setupChildVcForCell:cell atIndexPath:indexPath];
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}
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}
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- (void)collectionView:(UICollectionView *)collectionView didEndDisplayingCell:(UICollectionViewCell *)cell forItemAtIndexPath:(NSIndexPath *)indexPath {
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// NSLog(@"消失消失:current:---- %ld old ----- %ld indexpathRow----%ld ", _currentIndex, _oldIndex, indexPath.row);
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if (!self.forbidTouchToAdjustPosition) {
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if (_currentIndex == indexPath.row) {// 没有滚动完成
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if (_needManageLifeCycle) {
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UIViewController<ZJScrollPageViewChildVcDelegate> *currentVc = [self.childVcsDic valueForKey:[NSString stringWithFormat:@"%ld", _oldIndex]];
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// 开始出现
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[currentVc beginAppearanceTransition:YES animated:NO];
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UIViewController<ZJScrollPageViewChildVcDelegate> *oldVc = [self.childVcsDic valueForKey:[NSString stringWithFormat:@"%ld", indexPath.row]];
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// 开始消失
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[oldVc beginAppearanceTransition:NO animated:NO];
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}
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[self didAppearWithIndex:_oldIndex];
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[self didDisappearWithIndex:indexPath.row];
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}
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else {
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if (_oldIndex == indexPath.row) {
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// 滚动完成
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[self didAppearWithIndex:_currentIndex];
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[self didDisappearWithIndex:indexPath.row];
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}
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else {
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// 滚动没有完成又快速的反向打开了另一页
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if (_needManageLifeCycle) {
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UIViewController<ZJScrollPageViewChildVcDelegate> *currentVc = [self.childVcsDic valueForKey:[NSString stringWithFormat:@"%ld", _oldIndex]];
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// 开始出现
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[currentVc beginAppearanceTransition:YES animated:NO];
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UIViewController<ZJScrollPageViewChildVcDelegate> *oldVc = [self.childVcsDic valueForKey:[NSString stringWithFormat:@"%ld", indexPath.row]];
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// 开始消失
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[oldVc beginAppearanceTransition:NO animated:NO];
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// 消失
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}
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[self didAppearWithIndex:_oldIndex];
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[self didDisappearWithIndex:indexPath.row];
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}
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}
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}
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else {
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if (_scrollOverOnePage) {
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if (labs(_currentIndex-indexPath.row) == 1) { //滚动完成
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[self didAppearWithIndex:_currentIndex];
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[self didDisappearWithIndex:_oldIndex];
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}
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}
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else {
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[self didDisappearWithIndex:_oldIndex];
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[self didAppearWithIndex:_currentIndex];
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}
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}
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}
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#pragma mark - getter --- setter
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- (void)setCurrentIndex:(NSInteger)currentIndex {
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if (_currentIndex != currentIndex) {
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_currentIndex = currentIndex;
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if (self.segmentView.segmentStyle.isAdjustTitleWhenBeginDrag) {
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[self adjustSegmentTitleOffsetToCurrentIndex:currentIndex];
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}
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}
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}
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- (ZJCollectionView *)collectionView {
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if (_collectionView == nil) {
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ZJCollectionView *collectionView = [[ZJCollectionView alloc] initWithFrame:self.bounds collectionViewLayout:self.collectionViewLayout];
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[collectionView setBackgroundColor:[UIColor whiteColor]];
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collectionView.pagingEnabled = YES;
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collectionView.scrollsToTop = NO;
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collectionView.showsHorizontalScrollIndicator = NO;
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collectionView.delegate = self;
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collectionView.dataSource = self;
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collectionView.bounces = YES;
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[collectionView registerClass:[UICollectionViewCell class] forCellWithReuseIdentifier:cellID];
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collectionView.bounces = self.segmentView.segmentStyle.isContentViewBounces;
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collectionView.scrollEnabled = self.segmentView.segmentStyle.isScrollContentView;
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[self addSubview:collectionView];
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_collectionView = collectionView;
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}
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return _collectionView;
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}
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- (UICollectionViewFlowLayout *)collectionViewLayout {
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if (_collectionViewLayout == nil) {
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UICollectionViewFlowLayout *layout = [[UICollectionViewFlowLayout alloc] init];
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layout.itemSize = self.bounds.size;
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layout.minimumLineSpacing = 0.0;
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layout.minimumInteritemSpacing = 0.0;
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layout.scrollDirection = UICollectionViewScrollDirectionHorizontal;
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_collectionViewLayout = layout;
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}
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return _collectionViewLayout;
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}
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- (NSMutableDictionary<NSString *,UIViewController<ZJScrollPageViewChildVcDelegate> *> *)childVcsDic {
|
if (!_childVcsDic) {
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NSMutableDictionary *dic = [NSMutableDictionary dictionary];
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_childVcsDic = dic;
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}
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return _childVcsDic;
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}
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@end
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