使用UIRefreshControl的水平UICollectionView

时间:2013-06-23 09:50:44

标签: ios uikit uicollectionview pull-to-refresh uirefreshcontrol

我有一个自定义水平集合视图,有1行,我想添加pull to refresh功能,默认情况下,它出现在我的单元格行上方。我希望用户能够从左到右拉动集合视图以激活UIRefreshControl。有什么想法吗?

提前致谢。

3 个答案:

答案 0 :(得分:6)

基本上上面的响应告诉你如何在Objective-C中更多地在UICollectionView中加载。但是,我认为问题是如何在该组件上水平刷新。

我认为你不能水平添加UIRefreshControl,但考虑到之前的代码并转换为Swift我想出了以下代码

请勿忘记将您的UICollectionView弹跳属性设置为

func scrollViewDidScroll(scrollView: UIScrollView) {
    let offset = scrollView.contentOffset
    let inset = scrollView.contentInset
    let y: CGFloat = offset.x - inset.left
    let reload_distance: CGFloat = -75
    if y < reload_distance{
        scrollView.bounces = false
        UIView.animateWithDuration(0.3, animations: { () -> Void in
             scrollView.setContentOffset(CGPointMake(0, 0), animated: false)
        }, completion: { (Bool) -> Void in
             scrollView.bounces = true
        })
    }
}

另外,为了避免连续拉动的问题,我添加了一些代码来暂时删除弹跳,动画de向右滚动,然后再次启用弹跳。这将为您提供与UIRefreshControl相同的效果。

最后,如果你想要一个加载图标我的建议是将它添加到控制器后面,所以当你拉动你可以看到它背后

答案 1 :(得分:2)

只需添加Julio Bailon的Obj-C版本的答案,该版本适用于将collectionView从其顶部拉出,即从左到右

    CGPoint offset = scrollView.contentOffset;
    CGRect bounds = scrollView.bounds;
    CGSize size = scrollView.contentSize;
    UIEdgeInsets inset = scrollView.contentInset;
    float y = offset.x - inset.left;
    float h = size.width;


    float reload_distance = -75; //distance for which you want to load more
    if(y < reload_distance) {
        // write your code getting the more data
        NSLog(@"load more rows");

    }

答案 2 :(得分:1)

为此,您需要实现UIScrollViewDelegate方法

- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
     CGPoint offset = scrollView.contentOffset;
     CGRect bounds = scrollView.bounds;
     CGSize size = scrollView.contentSize;
     UIEdgeInsets inset = scrollView.contentInset;
     float y = offset.x + bounds.size.width - inset.right;
     float h = size.width;


     float reload_distance = 75; //distance for which you want to load more
     if(y > h + reload_distance) {
        // write your code getting the more data
        NSLog(@"load more rows");

     }
 }