所以我在键盘出现时在键盘顶部显示一个按钮，然后在键盘关闭时隐藏它但动画流程不够流畅
我想用键盘上下移动它(不阻塞 UI)
图片:
当键盘出现时，您可以看到键盘仍未完全出现，但我的按钮在这里
当它隐藏时，仍然没有完全关闭，但按钮消失了
我的代码:
代码:
viewDidLoad ...... {
// here we have notification observers for tracking the states of Keyboard
NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(LaunchScreenViewController.keyboardWillShow(_:)), name: UIKeyboardWillShowNotification, object: nil)
NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(LaunchScreenViewController.keyboardWillHide(_:)), name: UIKeyboardWillHideNotification, object: nil)
}
func keyboardWillShow(notification:NSNotification) { // in this function i'm changing the origin (Y) axis of my button os that it can appear on top of my keyboard
let userInfo:NSDictionary = notification.userInfo!
let keyboardFrame:NSValue = userInfo.valueForKey(UIKeyboardFrameEndUserInfoKey) as! NSValue
let keyboardRectangle = keyboardFrame.CGRectValue()
UIView.animateWithDuration(0.3) {
self.nextButtonConstraint.constant = keyboardRectangle.height
}
}
func keyboardWillHide(notification:NSNotification) {
UIView.animateWithDuration(0.5) {
self.nextButtonConstraint.constant = -50 // here i'm making my button out of screen bounds
}
}
最佳答案
你应该应用正确的动画:
self.nextButtonConstraint.constant = keyboardRectangle.height
UIView.animateWithDuration(0.3) {
<outlet to nextButton>.layoutIfNeeded() // insert correct value in <>
}
并且不要使用 0.3，而是从 UIKeyboardAnimationDurationUserInfoKey 中获取 timeInterval
关于ios - 根据键盘的可用性平滑地隐藏和显示按钮，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/38997410/