以下是textField和toolBar的动画，当键盘出现时，它会向上移动。
baseConstraint.constant = 211
self.view.setNeedsUpdateConstraints()
UIView.animateWithDuration(0.30, animations: {
self.view.layoutIfNeeded()
})
它很接近但不完全相同。你会如何修改上面的动画？
编辑：
以下是使用以下答案的最终代码！
func keyboardWillShow(aNotification: NSNotification) {
let duration = aNotification.userInfo.objectForKey(UIKeyboardAnimationDurationUserInfoKey) as Double
let curve = aNotification.userInfo.objectForKey(UIKeyboardAnimationCurveUserInfoKey) as UInt
self.view.setNeedsLayout()
baseConstraint.constant = 211
self.view.setNeedsUpdateConstraints()
UIView.animateWithDuration(duration, delay: 0, options: UIViewAnimationOptions.fromMask(curve), animations: {
self.view.layoutIfNeeded()
}, completion: {
(value: Bool) in println()
})
}
答案 0 :(得分：25)
您可以通过keyboardWillShow：notifications上的userInfo字典获取动画持续时间和动画曲线。
首先注册通知
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];
然后从通知userInfo键中获取值。
- (void)keyboardWillShow:(NSNotification*)notification {
NSNumber *duration = [notification.userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey];
NSNumber *curve = [notification.userInfo objectForKey: UIKeyboardAnimationCurveUserInfoKey];
// Do stuff with these values.
}
这些密钥中有很多，你也可以从UIKeyboardWillDismiss通知中获取它们。
此功能一直可用于iOS 3.0：D
继承人的文件：
如果您需要帮助，请告知我们。
Swift版本：
NSNotificationCenter.defaultCenter().addObserver(self, selector: "keyboardWillShow:", name: UIKeyboardWillShowNotification, object: nil)
func keyboardWillShow(aNotification: NSNotification) {
let duration = aNotification.userInfo.objectForKey(UIKeyboardAnimationDurationUserInfoKey) as NSNumber
let curve = aNotification.userInfo.objectForKey(UIKeyboardAnimationCurveUserInfoKey) as NSNumber
}
答案 1 :(得分：17)
可变持续时间的答案是正确的，并且工作iOS 3到8，但是使用新版本的Swift，答案的代码不再起作用了。 也许这是我的错误，但我必须写：
let duration = aNotification.userInfo![UIKeyboardAnimationDurationUserInfoKey] as Double
let curve = aNotification.userInfo![UIKeyboardAnimationCurveUserInfoKey] as UInt
self.view.setNeedsLayout()
//baseConstraint.constant = 211
self.view.setNeedsUpdateConstraints()
UIView.animateWithDuration(duration, delay: 0.0, options: UIViewAnimationOptions(curve), animations: { _ in
//self.view.layoutIfNeeded()
}, completion: { aaa in
//(value: Bool) in println()
})
看起来objectForKey不再起作用，转换更严格。
答案 2 :(得分：9)
swift3
let duration = noti.userInfo?[UIKeyboardAnimationDurationUserInfoKey] as! NSNumber
let curve = noti.userInfo?[UIKeyboardAnimationCurveUserInfoKey] as! NSNumber
self.view.setNeedsLayout()
UIView.animate(withDuration: TimeInterval(duration), delay: 0, options: [UIViewAnimationOptions(rawValue: UInt(curve))], animations: {
self.view.layoutIfNeeded()
}, completion: nil)
答案 3 :(得分：5)
Swift 4更新，iOS 11 +
首先在视图的生命周期方法中注册通知：
override func viewDidLoad() {
super.viewDidLoad()
NotificationCenter.default.addObserver(self, selector: #selector(keyBoardWillShow(notification:)), name: .UIKeyboardWillShow, object: nil)
}
然后在keyBoardWillShow方法中：
@objc func keyBoardWillShow(notification: NSNotification) {
guard let duration = notification.userInfo?[UIKeyboardAnimationDurationUserInfoKey] as? Double else {return}
print(duration) // you got animation's duration safely unwraped as a double
}
最后，不要忘记在deinit方法中删除观察者：
deinit {
NotificationCenter.default.removeObserver(self)
}
答案 4 :(得分：3)
首先，选择的答案是正确的方法。
这里可以提供更多动画真实的内容。如果您在UIViewAnimation块中打印所有CAAnimations，则在将动画曲线设置为键盘通知中提供的曲线时，您会发现它是CASpringAnimation 。持续时间为0.5，其他参数为：
let ani = CASpringAnimation(keyPath: someKey)
ani.damping = 500
ani.stiffness = 1000
ani.mass = 3
ani.duration = 0.5
上面的代码可以精确地再现动画。
一旦将动画曲线设置为键盘，UIView动画将忽略参数中的持续时间。 （如果您确实要更改持续时间，请调整mass值。）
答案 5 :(得分：1)
//首先在类UITextFieldDelegate
中声明委托//放置在视图控制器的顶部
// ****************** Keyboard Animation ***************
var animateDistance = CGFloat()
struct MoveKeyboard {
static let KEYBOARD_ANIMATION_DURATION : CGFloat = 0.3
static let MINIMUM_SCROLL_FRACTION : CGFloat = 0.2;
static let MAXIMUM_SCROLL_FRACTION : CGFloat = 0.8;
static let PORTRAIT_KEYBOARD_HEIGHT : CGFloat = 216;
static let LANDSCAPE_KEYBOARD_HEIGHT : CGFloat = 162;
}
//
//复制和害虫文本字段委托您班级的方法
func textFieldDidBeginEditing(textField: UITextField) {
let textFieldRect : CGRect = self.view.window!.convertRect(textField.bounds, fromView: textField)
let viewRect : CGRect = self.view.window!.convertRect(self.view.bounds, fromView: self.view)
let midline : CGFloat = textFieldRect.origin.y + 0.5 * textFieldRect.size.height
let numerator : CGFloat = midline - viewRect.origin.y - MoveKeyboard.MINIMUM_SCROLL_FRACTION * viewRect.size.height
let denominator : CGFloat = (MoveKeyboard.MAXIMUM_SCROLL_FRACTION - MoveKeyboard.MINIMUM_SCROLL_FRACTION) * viewRect.size.height
var heightFraction : CGFloat = numerator / denominator
if heightFraction > 1.0 {
heightFraction = 1.0
}
let orientation : UIInterfaceOrientation = UIApplication.sharedApplication().statusBarOrientation
if (orientation == UIInterfaceOrientation.Portrait || orientation == UIInterfaceOrientation.PortraitUpsideDown) {
animateDistance = floor(MoveKeyboard.PORTRAIT_KEYBOARD_HEIGHT * heightFraction)
} else {
animateDistance = floor(MoveKeyboard.LANDSCAPE_KEYBOARD_HEIGHT * heightFraction)
}
var viewFrame : CGRect = self.view.frame
viewFrame.origin.y -= animateDistance
UIView.beginAnimations(nil, context: nil)
UIView.setAnimationBeginsFromCurrentState(true)
UIView.setAnimationDuration(NSTimeInterval(MoveKeyboard.KEYBOARD_ANIMATION_DURATION))
self.view.frame = viewFrame
UIView.commitAnimations()
}
func textFieldDidEndEditing(textField: UITextField) {
var viewFrame : CGRect = self.view.frame
viewFrame.origin.y += animateDistance
UIView.beginAnimations(nil, context: nil)
UIView.setAnimationBeginsFromCurrentState(true)
UIView.setAnimationDuration(NSTimeInterval(MoveKeyboard.KEYBOARD_ANIMATION_DURATION))
self.view.frame = viewFrame
UIView.commitAnimations()
}
func textFieldShouldReturn(textField: UITextField) -> Bool {
textField.resignFirstResponder()
return true
}
答案 6 :(得分：1)
Swift 5解决方案
let duration = notification.userInfo?[UIResponder.keyboardAnimationDurationUserInfoKey] as! Double
let curve = notification.userInfo![UIResponder.keyboardAnimationCurveUserInfoKey] as! UInt
UIView.animate(
withDuration: duration,
delay: 0.0,
options: UIView.AnimationOptions(rawValue: curve),
animations: {
self.view.layoutIfNeeded()
}
)
答案 7 :(得分：0)
我想指出在解决这个问题时绊倒我的事情。由于新的“快速”视图及其显示/隐藏功能（仅限iOS8），我需要键盘的大小。这就是我最终解决它的方法：
- (void)keyboardWillChangeFrame:(NSNotification *)notification {
NSValue *value = notification.userInfo[UIKeyboardFrameEndUserInfoKey];
self.keyboardFrame = [value CGRectValue];
NSTimeInterval duration = [notification.userInfo[UIKeyboardAnimationDurationUserInfoKey] doubleValue];
[UIView animateWithDuration:duration animations:^{
//ANIMATE VALUES HERE
}];
}
答案 8 :(得分：0)
Swift 4
NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillShow), name: .UIKeyboardWillShow, object: nil)
func keyboardWillShow(notification: NSNotification) {
let duration = notification.userInfo?[UIKeyboardAnimationDurationUserInfoKey]
print("duration",duration)
}
答案 9 :(得分：0)
Swift 5的正确解决方案
NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillChange), name: NSNotification.Name.UIKeyboardWillChangeFrame, object: nil)
然后
@objc func keyboardWillChange(notification: NSNotification) {
guard let userInfo = notification.userInfo else { return }
let duration = userInfo[UIKeyboardAnimationDurationUserInfoKey] as! Double
let curve = userInfo[UIKeyboardAnimationCurveUserInfoKey] as! UInt
let targetFrame = (userInfo[UIKeyboardFrameEndUserInfoKey] as! NSValue).cgRectValue
self.bottomConstraint.constant = UIScreen.main.bounds.height - targetFrame.origin.y
UIView.animate(withDuration: duration) {
self.view.layoutIfNeeded()
}
}