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  • 如何判断ScrollView滑动方向

    1/判断滚动视图左右滚动

       {
        CGFloat startContentOffsetX;//滚动开始的坐标
        CGFloat willEndContentOffsetX; //滚动即将停止的坐标
        CGFloat endContentOffsetX;//滚动结束的坐标
     }

    - (void)scrollViewDidScroll:(UIScrollView *)scrollView{ myPC.currentPage = scrollView.contentOffset.x / scrollView.frame.size.width; currNum = (int)myPC.currentPage; } - (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView{ startContentOffsetX = scrollView.contentOffset.x; [self stopTimer]; } - (void)scrollViewWillEndDragging:(UIScrollView *)scrollView withVelocity:(CGPoint)velocity targetContentOffset:(inout CGPoint *)targetContentOffset{ //将要停止前的坐标 willEndContentOffsetX = scrollView.contentOffset.x; } - (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView{ endContentOffsetX = scrollView.contentOffset.x; if (endContentOffsetX < willEndContentOffsetX && willEndContentOffsetX < startContentOffsetX) { //画面从右往左移动,前一页 isNext = NO; } else if (endContentOffsetX > willEndContentOffsetX && willEndContentOffsetX > startContentOffsetX) {//画面从左往右移动,后一页 isNext = YES; } [self starTimer]; }

    2/判断上下滚动视图上下滚动

    float lastContentOffset;
    - (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView{
        lastContentOffset = scrollView.contentOffset.y; 
    }
     
    - (void)scrollViewWillBeginDecelerating:(UIScrollView *)scrollView{
        if (lastContentOffset < scrollView.contentOffset.y) {
            NSLog(@"向上滚动");
        }else{
            NSLog(@"向下滚动");
        }
    }
    

      

      

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  • 原文地址:https://www.cnblogs.com/mapanguan/p/5853938.html
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