scrollview自定义pageEnable

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最新推荐文章于 2024-08-17 23:03:51 发布

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分类专栏： iOS 代码

本文链接：https://blog.youkuaiyun.com/baidu_32469997/article/details/50679476

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本文详细介绍了如何使用Objective-C处理UIScrollView的翻页效果，包括开始拖动、结束拖动和减速停止时的逻辑处理。

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#pragma mark <UIScrollViewDelegate>
- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView {
    _startY = scrollView.contentOffset.y;
}
- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate {
    if (decelerate) return;
    [selfdealPageEnableWithScrollView:scrollView];
}
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView {
    [selfdealPageEnableWithScrollView:scrollView];
}
#pragma mark 处理scrollView翻页效果
- (void)dealPageEnableWithScrollView:(UIScrollView *)scrollView{
    static CGFloat halfH;
    halfH = halfH ? halfH : scrollView.bounds.size.height;
    NSLog(@"-----------------%zi%zi%zi",scrollView.contentOffset.y > (_otherPageStartY - halfH),_startY < scrollView.contentOffset.y,_startY < (_otherPageStartY - halfH));
    NSLog(@"*****************%zi%zi%zi",scrollView.contentOffset.y < _otherPageStartY,_startY > scrollView.contentOffset.y,_startY >= _otherPageStartY);
    if (scrollView.contentOffset.y > (_otherPageStartY - halfH +60) &&
        _startY < scrollView.contentOffset.y &&
        _startY < _otherPageStartY
//        _isSecondPage) {//此处还可以用一个BOOL类型来记录是否是处在第一页,代替后面两个判断
        [UIViewanimateWithDuration:0.5animations:^{
            [scrollView setContentOffset:CGPointMake(0,_otherPageStartY)];
        } completion:^(BOOL finished) {
            NSLog(@"进入第二页------->%f",scrollView.contentOffset.y);
        }];
    }
    else if (scrollView.contentOffset.y < (_otherPageStartY -30) &&
             _startY > scrollView.contentOffset.y &&
             _startY >= (_otherPageStartY - halfH)
//        !_isSecondPage){
        [UIViewanimateWithDuration:0.5animations:^{
            [scrollView setContentOffset:CGPointZero];
        } completion:^(BOOL finished) {
            NSLog(@"进入第一页------->%f",scrollView.contentOffset.y);
        }];
    }