ios - Xcode6-Beta3 更新后，无法使用 Swift 访问键盘信息

Question

在 xcode6-beta3 更新之前，我能够通过键盘通知访问键盘的框架 (CGRect)。但是现在我尝试获得的每个值都是“nil”

通知码

notificationCenter.addObserver(self, selector: "keyboardWillAppear:", name: UIKeyboardWillShowNotification, object: nil)

keyboardWillAppear 功能代码

func keyboardWillAppear(notification: NSNotification){
    var keyboardSize = notification.userInfo[UIKeyboardFrameBeginUserInfoKey]!.frame.size.height
    println(keyboardSize)
}

我尝试打印的任何值都为零:

tried: .frame
       .size.height
       .size 

任何指针(指针，哈哈)或帮助将不胜感激

Answer 1

您的代码调整如下:

func shrinkTextView (ncMessage: NSNotification) {

 var keyboardSize: AnyObject? = ncMessage.userInfo[UIKeyboardFrameBeginUserInfoKey]
 println("\(keyboardSize?)")

 }

...打印

可选(NSRect:{{0, 568}, {320, 216}})

您是否正确添加了观察者？我试过这样:

 NSNotificationCenter.defaultCenter().addObserver(
 self, selector: "shrinkTextView:",
 name: "UIKeyboardWillShowNotification", object: nil)