iOS 7 - 键盘动画
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我试图在iPhone 5模拟器上理解ios 7.0中的新键盘动画。我想在键盘出现时调整UITableView
的大小,但我无法获得正确的动画细节。
当键盘出现或消失时,我正在使用NSNotification
对象的信息。
这是我的日志:
Move keyboard from {{0, 920}, {320, 216}} to {{0, 352}, {320, 216}}
with duration: 0.400000
and animation curve: 7
UIViewAnimationCurveEaseInOut = 0
UIViewAnimationCurveEaseIn = 1
UIViewAnimationCurveEaseOut = 2
UIViewAnimationCurveLinear = 3
动画曲线是未知值,我该怎么办?
在iOS 7中,键盘使用新的未记录的动画曲线。虽然有些人注意到使用未记录的动画选项值,但我更喜欢使用以下内容:
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:[notification.userInfo[UIKeyboardAnimationDurationUserInfoKey] doubleValue]];
[UIView setAnimationCurve:[notification.userInfo[UIKeyboardAnimationCurveUserInfoKey] integerValue]];
[UIView setAnimationBeginsFromCurrentState:YES];
// work
[UIView commitAnimations];
虽然建议使用基于块的动画,但是从键盘通知返回的动画曲线是UIViewAnimationCurve
,而您需要传递给基于块的动画的选项是UIViewAnimationOptions
。使用传统的UIView动画方法可以直接传递值。最重要的是,这将使用新的未记录的动画曲线(整数值为7)并使动画与键盘匹配。而且,它在iOS 6和7上也能正常工作。
现在我找到了解决方案。动画从点{0, 920}
开始到{0, 352}
。问题是UITableView
对象以{160, 568}
的大小开始,因此我在动画开始之前将UITableView
的大小更改为{160, 920}
。
关于未知动画曲线,我只是将参数设置为animationCurve << 16
,将其从视图动画曲线转换为视图动画选项。
该值不等于动画曲线的线性,缓和,缓和和缓和。
这是我的代码:
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(_keyboardWillShow:)
name:UIKeyboardWillShowNotification
object:nil];
和:
- (void)keyboardWillShow:(NSNotification *)aNotification {
NSDictionary *userInfo = aNotification.userInfo;
//
// Get keyboard size.
NSValue *beginFrameValue = userInfo[UIKeyboardFrameBeginUserInfoKey];
CGRect keyboardBeginFrame = [self.view convertRect:beginFrameValue.CGRectValue fromView:nil];
NSValue *endFrameValue = userInfo[UIKeyboardFrameEndUserInfoKey];
CGRect keyboardEndFrame = [self.view convertRect:endFrameValue.CGRectValue fromView:nil];
//
// Get keyboard animation.
NSNumber *durationValue = userInfo[UIKeyboardAnimationDurationUserInfoKey];
NSTimeInterval animationDuration = durationValue.doubleValue;
NSNumber *curveValue = userInfo[UIKeyboardAnimationCurveUserInfoKey];
UIViewAnimationCurve animationCurve = curveValue.intValue;
//
// Create animation.
CGRect tableViewFrame = self.tableView.frame;
bTableViewFrame.size.height = (keyboardBeginFrame.origin.y - tableViewFrame.origin.y);
self.tableView.frame = tableViewFrame;
void (^animations)() = ^() {
CGRect tableViewFrame = self.tableView.frame;
tableViewFrame.size.height = (keyboardEndFrame.origin.y - tableViewFrame.origin.y);
self.tableView.frame = tableViewFrame;
};
//
// Begin animation.
[UIView animateWithDuration:animationDuration
delay:0.0
options:(animationCurve << 16)
animations:animations
completion:nil];
}
您可以使用animateWithDuration
块并在其中设置曲线。它干净而且运作良好。
UIViewAnimationCurve curve = [[notification.userInfo objectForKey:UIKeyboardAnimationCurveUserInfoKey] integerValue];
double duration = [[notification.userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue];
[UIView animateWithDuration:duration
delay:0
options:UIViewAnimationOptionBeginFromCurrentState
animations:^{
[UIView setAnimationCurve:curve];
/* ANIMATION HERE */
// don't forget layoutIfNeeded if you use autolayout
}
completion:nil];
快乐的编码!
UPDATE
您可以使用我编写的简单的UIViewController类别https://github.com/Just-/UIViewController-KeyboardAnimation
使用UIKeyboardWillChangeFrameNotification
代替,因为一些国际键盘,如中文键盘,在使用过程中会改变高度。此代码也为键盘提供了正确的高度,即使在横向模式下也是如此。 (注意:以下代码适用于Autolayout)
//set your observer, in a method like viewDidLoad
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillChange:) name:UIKeyboardWillChangeFrameNotification object:nil];
- (void)keyboardWillChange:(NSNotification *)notification {
CGRect initialRect = [notification.userInfo[UIKeyboardFrameBeginUserInfoKey] CGRectValue];
CGFloat initialHeight = self.view.frame.size.height - [self.view convertRect:initialRect fromView:nil].origin.y;
CGRect keyboardRect = [notification.userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue];
CGFloat newHeight = self.view.frame.size.height - [self.view convertRect:keyboardRect fromView:nil].origin.y;
//set your constraints here, based on initialHeight and newHeight, which are the heights of the keyboard before & after animation.
[self.contentView setNeedsUpdateConstraints];
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:[notification.userInfo[UIKeyboardAnimationDurationUserInfoKey] doubleValue]];
[UIView setAnimationCurve:[notification.userInfo[UIKeyboardAnimationCurveUserInfoKey] integerValue]];
[UIView setAnimationBeginsFromCurrentState:YES];
[self.contentView layoutIfNeeded];
[UIView commitAnimations];
}
要使用与键盘相同的动画,您必须使用未记录的曲线选项。
- (void)keyboardWillHide:(NSNotification *)notification {
NSDictionary *userInfo = [notification userInfo];
CGRect rect = [userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue];
NSTimeInterval animationDuration = [[userInfo valueForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue];
NSInteger curve = [[userInfo objectForKey:UIKeyboardAnimationCurveUserInfoKey] intValue] << 16;
[UIView animateWithDuration:animationDuration delay:0.0 options:curve animations:^{
} completion:nil];
}
我发现实际上方法animateWithDuration:delay:usingSpringWithDamping:initialSpringVelocity:options:animations:completion:
是所有动画现在在iOS7和iOS8中完成的新方法。你只需要正确的持续时间,阻尼和速度,你就会得到同样的效果,但即使你可以改变速度/时间。
在Swift 4中
添加键盘通知的观察者:
- UIKeyboardDidShowNotification
- UIKeyboardDidHideNotification
通过
NSNotificationCenter.defaultCenter().addObserver(_ observer: Any,
selector aSelector: Selector,
name aName: NSNotification.Name?,
object anObject: Any?)
并使用键盘动画实现选择器以动画UI。为了创建有效的曲线值,我们需要将UIResponder.keyboardAnimationCurveUserInfoKey移位<< 16
func keyboardWillShow(_ notification: Notification!) {
if let info = notification.userInfo {
let keyboardSize = info[UIResponder.keyboardFrameEndUserInfoKey] as? CGRect
let duration = info[UIResponder.keyboardAnimationDurationUserInfoKey] as? Double
let curveVal = (info[UIResponder.keyboardAnimationCurveUserInfoKey] as? NSNumber)?.intValue ?? 7 // default value for keyboard animation
let options = UIView.AnimationOptions(rawValue: UInt(curveVal << 16))
UIView.animate(withDuration: duration, delay: 0, options: options, animations: {
// any operation to be performed
}, completion: nil)
}
}
注册通知:
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];
通过动画更改视图的frame.origin.y来响应。
- (void)keyboardWillShow:(NSNotification *)aNotification {
NSDictionary *userInfo = aNotification.userInfo;
NSValue *endFrameValue = userInfo[UIKeyboardFrameEndUserInfoKey];
CGRect keyboardEndFrame = [self.view convertRect:endFrameValue.CGRectValue fromView:nil];
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:[aNotification.userInfo[UIKeyboardAnima以上是关于iOS 7 - 键盘动画的主要内容,如果未能解决你的问题,请参考以下文章
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