我有一个位于屏幕底部的文本视图，并希望在用户开始编辑文本视图时将其向上推。我知道如何向上推视图，但由于屏幕尺寸不同，显示屏始终不一样。我想获得键盘的高度，以便在用户编辑时文本视图位于其上方。我在下面有一段代码，但是当我添加以下3行时，应用程序无法构建并给我一个错误。没有这段代码，应用程序运行完美。我得到的错误是＆＃34; swift编译器错误：预期声明＆＃34;。这些行进入我的keyboardWillShow函数。
if let userInfo = sender.userInfo {
if let keyboardSize = (userInfo[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.CGRectValue() {
keyboardHeight = keyboardSize.height
}
所以完整的代码看起来像这样。
override func viewDidLoad() {
super.viewDidLoad()
NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("keyboardWillShow:"), name:UIKeyboardWillShowNotification, object: nil);
NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("keyboardWillHide:"), name:UIKeyboardWillHideNotification, object: nil);
}
var isShown: Bool = false
var willHide: Bool = false
var keyboardHeight: CGFloat = 0
func keyboardWillShow(sender: NSNotification) {
isShown = true
//The following 3 lines seem to be the problem. Somehow the code stops working when I add them.
if let userInfo = sender.userInfo {
if let keyboardSize = (userInfo[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.CGRectValue() {
keyboardHeight = keyboardSize.height
}
}
func keyboardWillHide(sender: NSNotification) {
willHide = true
}
func textViewDidBeginEditing(textView: UITextView) {
if isShown == true {
self.view.frame.origin.y -= keyboardHeight
}
}
func textViewDidEndEditing(textView: UITextView) {
if willHide == true {
self.view.frame.origin.y += keyboardHeight
}
}