[英]How to find keyboard height using Swift
let frame = (info[UIKeyboardFrameEndUserInfoKey] as NSValue) as CGRect
不起作用。 有谁知道为什么这不能按预期运作?
错误:'NSValue'无法转换为'CGRect'
请记住以下内容:
let curve = (info[UIKeyboardAnimationCurveUserInfoKey] as NSValue) as UInt
工作良好。
编辑:即使Apple文档表明这是一个小问题,因为在Cocoa中对UIKeyboardAnimationCurveUserInfoKey
的以下评论
// NSValue of CGRect
Edit2:调试器将其定义为NSConcreteValue。 如何将其转换为CGRect?
let frame = (info[UIKeyboardFrameEndUserInfoKey] as NSValue).CGRectValue()
在NSNotificationCenter中使用keyboardFrame高度
override func viewWillAppear(animated: Bool) {
NSNotificationCenter.defaultCenter().addObserver(self,
selector: #selector(self.keyboardWasShown(_:)),
name: UIKeyboardWillChangeFrameNotification,
object: nil)
NSNotificationCenter.defaultCenter().addObserver(self,
selector: #selector(self.keyboardWillHide(_:)),
name: UIKeyboardWillHideNotification,
object: nil)
}
func keyboardWasShown(notification: NSNotification) {
let info = notification.userInfo!
let keyboardFrame: CGRect = (info[UIKeyboardFrameEndUserInfoKey] as! NSValue).CGRectValue()
UIView.animateWithDuration(0.1, animations: { () -> Void in
self.constBottomLayout.constant = keyboardFrame.size.height
})
}
func keyboardWillHide(sender: NSNotification) {
// self.view.frame.origin.y = 0
self.constBottomLayout.constant = 0
}
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