如何防止键盘隐藏UITextField？
解决方法
我假设这是在UIViewController上发生的.如果是这样,您可以设置在键盘显示/隐藏时调用以下2个函数,并在其块中进行适当响应.
设置UIViewController：
class XXXViewController: UIViewController,UITextFieldDelegate... {
var frameView: UIView!
首先,在ViewDidLoad中：
override func viewDidLoad() {
self.frameView = UIView(frame: CGRectMake(0,self.view.bounds.width,self.view.bounds.height))
// Keyboard stuff.
let center: NSNotificationCenter = NSNotificationCenter.defaultCenter()
center.addobserver(self,selector: #selector(ATReportContentViewController.keyboardWillShow(_:)),name: UIKeyboardWillShowNotification,object: nil)
center.addobserver(self,selector: #selector(ATReportContentViewController.keyboardWillHide(_:)),name: UIKeyboardWillHideNotification,object: nil)
}
然后实现以下2个函数以响应上面ViewDidLoad中定义的NSNotificationCenter函数.我给你一个移动整个视图的例子,但你也可以只为UITextFields制作动画.
func keyboardWillShow(notification: NSNotification) {
let info:NSDictionary = notification.userInfo!
let keyboardSize = (info[UIKeyboardFrameBeginUserInfoKey] as! NSValue).CGRectValue()
let keyboardHeight: CGFloat = keyboardSize.height
let _: CGFloat = info[UIKeyboardAnimationDurationUserInfoKey] as! NSNumber as CGFloat
UIView.animateWithDuration(0.25,delay: 0.25,options: UIViewAnimationoptions.CurveEaseInOut,animations: {
self.frameView.frame = CGRectMake(0,(self.frameView.frame.origin.y - keyboardHeight),self.view.bounds.height)
},completion: nil)
}
func keyboardWillHide(notification: NSNotification) {
let info: NSDictionary = notification.userInfo!
let keyboardSize = (info[UIKeyboardFrameBeginUserInfoKey] as! NSValue).CGRectValue()
let keyboardHeight: CGFloat = keyboardSize.height
let _: CGFloat = info[UIKeyboardAnimationDurationUserInfoKey] as! NSNumber as CGFloat
UIView.animateWithDuration(0.25,(self.frameView.frame.origin.y + keyboardHeight),completion: nil)
}
不要忘记在离开视图时删除通知
override func viewWilldisappear(animated: Bool) {
NSNotificationCenter.defaultCenter().removeObserver(self,object: nil)
NSNotificationCenter.defaultCenter().removeObserver(self,object: nil)
}