event.touchesForView().AnyObject() 在 Xcode 6.3 中不起作用

问题描述

这在以前非常有效:

func doSomethingOnDrag(sender: UIButton, event: UIEvent) {
    let touch = event.touchesForView(sender).AnyObject() as UITouch
    let location = touch.locationInView(sender)
}

但在 Xcode 6.3 中，我现在收到错误:

But in Xcode 6.3, I now get the error:

不能不带参数调用AnyObject"

我该如何解决这个问题?

How do I fix this?

推荐答案

在 1.2 中，touchesForView 现在返回原生 Swift Set 而不是 NSSet，而 Set 没有 anyObject() 方法.

In 1.2, touchesForView now returns a native Swift Set rather than an NSSet, and Set doesn't have an anyObject() method.

它确实有一个 first 方法，这很相似.另请注意，您将无法再使用 as?，您必须使用 as? 进行转换并处理零可能性，这是一个方法:

It does have a first method, which is much the same thing. Note, also, that you won't be able to use as? any more, you'll have to cast it using as? and handle the nil possibility, here's one approach:

func doSomethingOnDrag(sender: UIButton, event: UIEvent) {
    if let touch = event.touchesForView(sender)?.first as? UITouch,
           location = touch.locationInView(sender) {
            // use location
    }
}

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