通过 UICollectionView 单元格快速枚举 - Swift [英] Fast Enumeration through UICollectionView Cells - Swift

问题描述

我正在尝试快速枚举我所有的集合视图单元格，但是下面的这个实现给了我一个警告.

I am trying to fast enumerate through all of my collection view cells, however this implementation below is giving me a warning.

for cell in self.collectionView?.visibleCells() as [UICollectionViewCell] {

    // Do Stuff
}

下面的错误出现在第一行:

Error below appears on first line:

后缀'?'的操作数应该有可选类型；类型是'(UICollectionView, cellForItemAtIndexPath: NSIndexPath) ->UICollectionViewCell'

Operand of postfix '?' should have optional type; type is '(UICollectionView, cellForItemAtIndexPath: NSIndexPath) -> UICollectionViewCell'

我尝试过使用可选项并在 Xcode 6 Beta 6 中使用它，但在Beta 7"中无济于事

I've tried messing around with optionals and had this working in Xcode 6 Beta 6, but to no avail in "Beta 7"

我如何摆脱这个错误?/编写一个遍历我所有 CollectionView 单元格的循环?

How do i get rid of this error? / Write a loop that goes through all my CollectionView Cells ?

推荐答案

collectionView 属性现在是一个可选 UICollectionView?，所以你有打开它:

The collectionView property is now an optional UICollectionView?, so you have to unwrap it:

for cell in self.collectionView!.visibleCells() as [UICollectionViewCell] { ... }

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