【发布时间】：2015-11-12 20:22:13
【问题描述】：
我有一个注册页面，其中有 3 个文本字段。触摸文本字段时视图会向上滑动，以便在显示键盘时可以看到字段。但是，如果用户快速点击文本字段两次，而不是点击一次，则键盘会变黑，并且视图定位会变得不可挽回。这是问题的照片，代码如下，在此先感谢]1
override func viewDidLoad() {
super.viewDidLoad()
emailTextField.delegate = self
passwordTextField.delegate = self
verifyPasswordTextField.delegate = self
emailTextField.autocorrectionType = UITextAutocorrectionType.No
NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("keyboardWillShow:"), name: UIKeyboardWillShowNotification, object: nil)
NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("keyboardWillHide:"), name: UIKeyboardWillHideNotification, object: nil)
}
// method to move the view up when keyboard appears
func keyboardWillShow(notification: NSNotification) {
if viewIsLifted == false {
if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.CGRectValue() {
// hide the logo and name when view slides up
UIView.animateWithDuration(0.2, delay: 0.0, options: UIViewAnimationOptions.CurveEaseInOut, animations: { () -> Void in
self.likemojiIcon.alpha = 0
self.likemojiLabel.alpha = 0
}, completion: nil)
self.view.frame.origin.y -= keyboardSize.height
viewIsLifted = true
}
}
}
// method to slide view back down when keyboard is resigned
func keyboardWillHide(notification: NSNotification) {
if viewIsLifted == true {
if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.CGRectValue() {
// make logo and name reappear on slide back down
UIView.animateWithDuration(0.2, delay: 0.0, options: UIViewAnimationOptions.CurveEaseInOut, animations: { () -> Void in
self.likemojiIcon.alpha = 1
self.likemojiLabel.alpha = 1
}, completion: nil)
self.view.frame.origin.y += keyboardSize.height
viewIsLifted = false
}
}
}
【问题讨论】：
标签： ios swift uitextfield