UICollectionViewController中的Pull-to-refresh [英] Pull-to-refresh in UICollectionViewController

问题描述

我想在iOS 6下的 UICollectionViewController 中实现pull-down-to-refresh。这很容易用 UITableViewController实现，如下所示：

I want to implement pull-down-to-refresh in a UICollectionViewController under iOS 6. This was easy to achieve with a UITableViewController, like so:

UIRefreshControl *refreshControl = [[UIRefreshControl alloc] init];
[refreshControl addTarget:self action:@selector(startRefresh:)
    forControlEvents:UIControlEventValueChanged];
self.refreshControl = refreshControl;

以上实现了一个漂亮的液滴动画作为原生小部件的一部分。

The above implements a nice liquid-drop animation as part of a native widget.

作为 UICollectionViewController 是一个更进化的 UITableViewController 有人会期待功能的奇偶性，但我无法在任何地方找到实现此内置方式的参考。

As UICollectionViewController is a "more evolved" UITableViewController one would expect somewhat of a parity of features, but I can't find a reference anywhere to a built-in way to implement this.

1. 是否有一个简单的这样做的方式我忽略了吗？


2. 可以 UIRefreshControl 以某种方式使用 UICollectionViewController 尽管标题和文档都声明它与表视图一起使用？

1. Is there a simple way to do this that I'm overlooking?
2. Can UIRefreshControl be used somehow with UICollectionViewController despite the header and docs both stating that it's meant to be used with a table view?

推荐答案

（1）和（2）的答案都是肯定的。

The answers to both (1) and (2) are yes.

只需添加 UIRefreshControl 实例作为 .collectionView 的子视图，它只是有效。

Simply add a UIRefreshControl instance as a subview of .collectionView and it just works.

UIRefreshControl *refreshControl = [[UIRefreshControl alloc] init];
[refreshControl addTarget:self action:@selector(startRefresh:)
    forControlEvents:UIControlEventValueChanged];
[self.collectionView addSubview:refreshControl];

就是这样！我希望在某个地方的文档中已经提到过这一点，尽管有时一个简单的实验可以解决这个问题。

That's it! I wish this had been mentioned in the documentation somewhere, even though sometimes a simple experiment does the trick.

编辑：如果集合不大，这个解决方案将不起作用足以拥有一个活动的滚动条。如果你添加这个陈述，

this solution won't work if the collection is not big enough to have an active scrollbar. If you add this statement,

self.collectionView.alwaysBounceVertical = YES;

然后一切都很完美。此修复取自关于同一主题的其他帖子（在其他已发布的答案的评论中引用）。

then everything works perfectly. This fix taken from another post on the same topic (referenced in a comment in the other posted answer).

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