UICollectionView中的cell包含UIScrollview

需求：在scrollview的子View不为0，当scrollview的展示的index不为0且向右滑动CollectionView。CollectionView不滑动Cell,而是让scrollview切换内容，想左滑同理。

开始真的难到我了。后来在CollectionView上添加了一个滑动手势，代替自带的滑动手势。

UIPanGestureRecognizer *ges = [[UIPanGestureRecognizer alloc]initWithTarget:self action:@selector(mainViewGes:)];
        ges.delegate =self;
        [_mainView addGestureRecognizer:ges

　　MainView即UICollectionView

- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer{
    //用自定义的手势覆盖collectionView自带的手势
    return YES;
}

　　重新这个方法。

- (void)mainViewGes:(UIPanGestureRecognizer *)ges{
    if (ges.state == UIGestureRecognizerStateChanged) {
        //        [self commitTranslation:[ges translationInView:self.view]];
    }else if (ges.state == UIGestureRecognizerStateBegan){
        //        NSLog(@"UIGestureRecognizerStateBegan");
        
    }else if (ges.state == UIGestureRecognizerStateEnded){
        //        NSLog(@"UIGestureRecognizerStateEnded");
        [self commitTranslation:[ges translationInView:self.view]];
    }
}

/** 判断手势方向  */
- (void)commitTranslation:(CGPoint)translation {
    CGFloat absX = fabs(translation.x);
    CGFloat absY = fabs(translation.y);
    // 设置滑动有效距离
    if (MAX(absX, absY) < 50)
        return;
    if (absX > absY ) {
        if (translation.x < 0) {//向左滑动
            if (self.page.sentences.count > 1 && self.sentenceIndex + 1 < self.page.sentences.count) {
                //想左滑动时，如果句子不是最后一个句子，那么是滑动句子
                [self.currentCell.bottomView setContentOffset:CGPointMake(self.currentCell.bottomView.frame.size.width * (self.sentenceIndex + 1), 0) animated:YES];
            }else{
                if (self.sentenceIndex + 1 == self.page.sentences.count) {
                    //如果向左滑动时，句子是最后一个句子，那么是滑动page
                    if (self.pageNumber + 1 != self.currentCopyModel.pages.count) {
                        [self.mainView setContentOffset:CGPointMake(screen_width * (self.pageNumber + 1), 0) animated:YES];
                    }
                }
            }
        }else{//向右滑动
            if (self.page.sentences.count > 1 && self.sentenceIndex > 0) {
                //当sentence不是第一个时，向右滑动是滑动句子
                [self.currentCell.bottomView setContentOffset:CGPointMake(self.currentCell.bottomView.frame.size.width * (self.sentenceIndex - 1), 0) animated:YES];
            }else{
                //当sentence为第一个时。滑动就变成了滑动page
                if (self.sentenceIndex == 0) {
                    if (self.pageNumber != 0) {
                        [self.mainView setContentOffset:CGPointMake(screen_width * (self.pageNumber-1), 0) animated:YES];
                    }
                }
            }
            
        }
    } else if (absY > absX) {
        if (translation.y<0) {//向上滑动
            
        }else{ //向下滑动
            
        }
    }
}

　　最后结果就是滑动手势结束之后才判断手势方向，然后手动调用CollectionView或Scrollview的setContenOffset方法。

- (void)scrollViewDidEndScrollingAnimation:(UIScrollView *)scrollView{

然后会在这个协议里接收到方法。进行处理

　　

此外还有一个跟👆类似的方法

- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView{

　　都是滑动动画结束时调用，区别官方注释挺清晰 = =

- (void)scrollViewDidEndScrollingAnimation:(UIScrollView *)scrollView; // called when setContentOffset/scrollRectVisible:animated: finishes. not called if not animating

　　

scrollViewDidEndScrollingAnimation方法是手动调用方法，停止动画后调用，

scrollViewDidEndDecelerating是手滑动操作后停止滑动后调用