ios - keyboardWillShow 第一次显示奇怪的高度

Question

当使用自定义键盘时，keyboardWillShow 运行两次(正常行为)，第一次高度为 0，但第二次是正确的高度，在我的例子中是 667。问题是这只是真实的第二次显示 viewController。我第一次得到下面的奇怪输出。

第一次打开 View Controller 时的控制台:

keyboardSize CGRect (origin = (x = 0, y = 258), size = (width = 0, height = 2.8876618518302306E-314))

控制台第二次打开 View Controller :

keyboardSize CGRect (origin = (x = 0, y = 0), size = (width = 0, height = 667))

我的代码:

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

func keyboardWillShow(notification: NSNotification) {
        if let userInfo = notification.userInfo {
            if let keyboardSize =  (userInfo[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.CGRectValue() {
                if keyboardSize.height > 0 { //in case of custom keyborad
                    kbHeight = keyboardSize.height
                    self.animateTextField(true)
                }
            }
        }
    }   

Answer 1

将 UIKeyboardFrameBeginUserInfoKey 更改为 UIKeyboardFrameEndUserInfoKey。就这些:

func keyboardWillShow(notification: NSNotification) {
  if let userInfo = notification.userInfo {
    if let keyboardSize =  (userInfo[UIKeyboardFrameEndUserInfoKey] as? NSValue)?.CGRectValue() {
      if keyboardSize.height > 0 { //in case of custom keyborad
        kbHeight = keyboardSize.height
        self.animateTextField(true)
                }
            }
        }
    }  

继续编码.......... :)