具有低高度 UICollectionView 的 UIRefreshControl [英] UIRefreshControl with low height UICollectionView

问题描述

我有一个视图，其中包含顶部的另一个视图，我用它来显示一些基本信息.它大约占总视图高度的 40%.在该标题"视图下方，我使用的是可滚动的 UICollectionView.现在我已经向我的 UICollectionView 添加了一个 UIRefreshControl，但从未发生刷新，因为用户无法将 UICollectionView 拉下那么远.当我降低顶视图的高度时，它开始工作，因为有足够的空间将集合视图拉下来.

I have a view which contains another view on the top part, which I'm using to show some basic information. It has about 40% of the total view height. Below that "header" view, I'm using a UICollectionView which is scrollable. Now I've added a UIRefreshControl to my UICollectionView, but refreshing does never occur, because the user can't pull down the UICollectionView that far. When I reduce the height of the top view, it starts working because there's enough space to pull the collectionview down then.

这是我添加 refreshControl 的方法:

Here's how I'm adding the refreshControl:

    self.matchDetailRefreshControl = UIRefreshControl()
    self.matchDetailRefreshControl.addTarget(self, action: #selector(MatchDetailViewController.fetchAll), forControlEvents: .ValueChanged)
    self.collectionView!.addSubview(self.matchDetailRefreshControl)
    self.collectionView!.alwaysBounceVertical = true

看看这个截图以供参考:

Have a look at this screenshot for reference:

如您所见，UIRefreshControl 并未完全填满，而我的手指已经位于屏幕底部.

As you can see, the UIRefreshControl doesn't get fully filled, while my finger is already at the bottom of the screen.

我该如何解决?

推荐答案

你可以实现 scrollViewDidScroll.如果 scrollView 的 contentOffset 超过某个点，则使用 beginRefreshing() 以编程方式实现刷新

You can implement scrollViewDidScroll. If the scrollView's contentOffset is past a certain point, then implement your refresh programmatically using beginRefreshing()

例如(刷新控件连接到名为refreshControl"的插座)

eg (with the refresh control connected to an outlet named 'refreshControl')

func scrollViewDidScroll(scrollView: UIScrollView) {

    let currentOffset = scrollView.contentOffset

    let yOffset = currentOffset.y

    if yOffset < -30.0 && !refreshControl.refreshing {
        refreshControl.beginRefreshing()
    }
}

如果您还没有设置滚动视图的委托，请不要忘记将其设置为 self

don't forget to set the scrollView's delegate to self if you haven't already

抱歉，是beginRefreshing()，而不是startRefreshing().

edit: sorry it's beginRefreshing(), not startRefreshing().

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