使用选择器'touchesBegan：withEvent：'的重写方法具有不兼容的类型'（NSSet，UIEvent）->（）'

Xcode 6.3。在实现UITextFieldDelegate协议的类中，我想重写touchesBegan（）方法以可能隐藏键盘。如果我避免函数规范中的编译器错误，则尝试从Set或NSSet读取“ touch”时会出现编译器错误，否则super.touchesBegan（touches，withEvent：event）会引发错误。这些组合之一是在Xcode 6.2中编译的！（因此，Swift“ Set”的文档在哪里以及如何从其中获取元素？）

 override func touchesBegan(touches: NSSet, withEvent event: UIEvent) { 
    // Hiding the Keyboard when the User Taps the Background
        if let touch =  touches.anyObject() as? UITouch {
            if nameTF.isFirstResponder() && touch.view != nameTF {
                nameTF.resignFirstResponder();
            }
        }
        super.touchesBegan(touches , withEvent:event)
    }

尝试：

override func touchesBegan(touches: NSSet, withEvent event: UIEvent) or
override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent) 

编译器错误：具有选择器'touchesBegan：withEvent：'的重写方法具有不兼容的类型'（NSSet，UIEvent）->（）'，并且

super.touchesBegan(touches , withEvent:event)

也抱怨

“ NSSet”不能隐式转换为“ Set”；您是说要使用“ as”进行显式转换吗？

尝试：

override func touchesBegan(touches: Set<AnyObject>, withEvent event: UIEvent) 

编译器错误：类型“ AnyObject”不符合协议“哈希”

尝试：

override func touchesBegan(touches: Set<NSObject>, withEvent event: UIEvent) 

编译器错误

if let touch = touches.anyObject() as? UITouch 

'Set'没有名为'anyObject'的成员，但函数规范和对super（）的调用都可以！

尝试：

override func touchesBegan(touches: NSSet<AnyObject>, withEvent event: UIEvent) -> () or
override func touchesBegan(touches: NSSet<NSObject>, withEvent event: UIEvent) 

编译器错误：无法专用于非通用类型“ NSSet”

Swift 1.2（Xcode 6.3）引入了Set与桥接的本机类型NSSet。Swift博客和 Xcode 6.3发行说明中都提到了这一点，但显然尚未将其添加到官方文档中（更新：正如Ahmad Ghadiri所指出的，现在已记录在案）。

该UIResponder方法现在声明为

func touchesBegan(touches: Set<NSObject>, withEvent event: UIEvent)

您可以像这样覆盖它：

override func touchesBegan(touches: Set<NSObject>, withEvent event: UIEvent) {
    if let touch = touches.first as? UITouch {
        // ...
    }
    super.touchesBegan(touches , withEvent:event)
}

Swift 2（Xcode 7）更新：（比较Swift 2中的Override Func错误）

override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
    if let touch = touches.first {
        // ...
    }
    super.touchesBegan(touches, withEvent:event)
}

Swift 3更新：

override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
    if let touch = touches.first {
        // ...
    }
    super.touchesBegan(touches, with: event)
}

对于xCode 7和swift 2.0，请使用以下代码：

override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {

    if let touch =  touches.first{
        print("\(touch)")
    }
    super.touchesBegan(touches, withEvent: event)
}

override func touchesEnded(touches: Set<UITouch>, withEvent event: UIEvent?) {

    if let touch = touches.first{
        print("\(touch)")
    }
    super.touchesEnded(touches, withEvent: event)
}

override func touchesMoved(touches: Set<UITouch>, withEvent event: UIEvent?) {

    if let touch = touches.first{
        print("\(touch)")
    }
    super.touchesMoved(touches, withEvent: event)
}

使用Swift 3和Xcode 8

override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {

}

override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {

}

override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {

}

override func touchesCancelled(_ touches: Set<UITouch>?, with event: UIEvent?) {
// Don't forget to add "?" after Set<UITouch>
}

现在可以在Apple API参考中找到它，并且要在xCode版本6.3和Swift 1.2中进行覆盖，可以使用以下代码：

override func touchesBegan(touches: Set<NSObject>, withEvent event: UIEvent) {
    if let touch =  touches.first as? UITouch {
         // ...
    }
    // ...
}

2015年12月19日的xCode 7.2 Swift 2.1的最新更新的当前版本。

下次再次遇到这样的错误时，请删除该函数，然后再次在“ touchesBe ...”中键入该函数，xCode应该会自动为您完成最新的功能，而不是尝试修复旧的功能。

override func touchesMoved(touches: Set<UITouch>, withEvent event: UIEvent?) {

    for touch: AnyObject! in touches {
        let touchLocation = touch.locationInNode(self)

        //Use touchLocation for example: button.containsPoint(touchLocation) meaning the user has pressed the button.
    }
}

对我有用的是：

    override func touchesBegan(touches: Set<NSObject>, withEvent event: UIEvent) {
        if let touch = touches.first as? UITouch {
            // ...
        }

        super.touchesBegan(touches , withEvent:event!)
    }

小加成。为了迅速编译没有错误，您需要添加

导入UIKit.UIGestureRecognizerSubclass

使用Swift 4和Xcode 9

override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {

}

  override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {

        if let touch = touches.first as? UITouch {

            if touch.view == self.view{
                self.dismiss(animated: true, completion: nil)
            }
        }
    }