关于ios：yellow警告：从UITextDocumentProxy强制转换为UIKeyInput的条件转换始终成功

yellow Warnings : Conditional cast from UITextDocumentProxy to UIKeyInput always succeeds

我正在使用键盘，我刚刚安装了xcode 7 beta 2
然后我收到很多警告。

我认为超过24个黄色错误会导致键盘崩溃
在xcode 6.4上没有错误，没有键盘课程

我发现很难解决这些错误。

警告：

Conditional cast from UITextDocumentProxy to UIKeyInput always succeeds

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15

func handleBtnPress(sender: UIButton) {
if let kbd = self.keyboard {
if let textDocumentProxy = kbd.textDocumentProxy as? UIKeyInput {
textDocumentProxy.insertText(sender.titleLabel!.text!)
}

kbd.hideLongPress()

if kbd.shiftState == ShiftState.Enabled {
kbd.shiftState = ShiftState.Disabled
}

kbd.setCapsIfNeeded()
}
}

警告：

Conditional cast from UITouch to UITouch always succeeds

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18

override func touchesEnded(touches: Set<UITouch>, withEvent event: UIEvent?) {
for obj in touches {
if let touch = obj as? UITouch {
let view = self.touchToView[touch]

let touchPosition = touch.locationInView(self)

if self.bounds.contains(touchPosition) {
self.handleControl(view, controlEvent: .TouchUpInside)
}
else {
self.handleControl(view, controlEvent: .TouchCancel)
}

self.touchToView[touch] = nil
}
}
}