问题描述
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我想在更改其隐藏模式的同时向视图添加动画,即
my_view.hidden=YES;
我在导航栏中添加了一个按钮。当我们单击它时,新视图设置为取消隐藏。它绘制在导航表的上方。
解决方法
不幸的是,hidden不是可以通过UIView动画设置动画的属性。我认为您最好的选择可能是使用@Erik B建议的动画之一,或者开始尝试功能更强大的Core Animations。浏览一下UIView动画和Core动画的文档。
通过使用UIView动画从另一个视图下面滑动新视图,我达到了您的建议。这使它看起来像抽屉一样滑出。如果要执行类似的操作,则需要拦截事件内部的补齐并将动画代码放在此处。
- (IBAction)buttonClicked:(id)sender {
[UIView animateWithDuration:0.5
delay:0.0
options:UIViewAnimationCurveEaseOut
animations:^(void) {
self.myView.frame = /* set the frame here */
}
completion:NULL];
}
, 将视图的不透明度从100%设置为0%。让动画完成回调将视图设置为隐藏。您可能还希望在回调期间将不透明度重新设置为100%,因此取消隐藏时视图将显示为完全不透明。
yourView.alpha = 0.0 //for zero opacity
yourView.alpha = 1.0 //for 100% opacity
, 但是没有隐藏的动画。使用以下Swift代码可以获得相同的结果:
UIView.animate(withDuration: 0.2,delay: 0,options: [],animations: {
self.yourView.alpha = 0 // Here you will get the animation you want
},completion: { _ in
self.yourView.hidden = true // Here you hide it when animation done
})
, 我认为更合适的方法是:
[UIView transitionWithView:aView
duration:0.3
options:UIViewAnimationOptionTransitionCrossDissolve
animations:^(void){
aView.hidden = NO;
}
completion:nil];
, 更新至Swift 3:
UIView.animate(withDuration: 0.2,delay: 0.2,options: .curveEaseOut,animations: {firstView.alpha = 0},completion: { _ in firstView.isHidden = true
//Do anything else that depends on this animation ending
})
而且,如果您希望在第一个视图消失后重新制作动画,则可以使用alpha = 1
和hidden = false
复制完成块内的代码。
, 这是我写的一个类别,目的是在UIView上引入一个新的“ hidden \”属性,该属性正确支持动画:
@implementation UIView (AnimateHidden)
-(void)setHiddenAnimated:(BOOL)hide
{
[UIView animateWithDuration:0.5
delay:0.0
options: UIViewAnimationCurveEaseOut
animations:^
{
[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
if (hide)
self.alpha=0;
else
{
self.hidden= NO;
self.alpha=1;
}
}
completion:^(BOOL b)
{
if (hide)
self.hidden= YES;
}
];
}
@end
, 已更正为新泽西州版本:
@implementation UIView (AnimateHidden)
-(void)setHiddenAnimated:(BOOL)hide duration:(NSTimeInterval)duration {
if(self.hidden == hide)
return;
if(hide)
self.alpha = 1;
else {
self.alpha = 0;
self.hidden = NO;
}
[UIView animateWithDuration:duration animations:^{
if (hide)
self.alpha = 0;
else
self.alpha = 1;
} completion:^(BOOL finished) {
if(finished)
self.hidden = hide;
}];
}
@end
, 这是此的快速版本:
UIView.animateWithDuration(0.5,options:
UIViewAnimationOptions.CurveEaseOut,animations: {
objView.alpha = 0
},completion: { finished in
objView.hidden = true
})
这将以5秒的持续时间和2秒的延迟后执行动画。
可用的AnimationOptions是:
CurveEaseInOut,CurveEaseIn,CurveEaseOut,CurveLinear
, 新泽西和斯坦尼斯拉夫的答案在这里帮助我为此添加了一个新类别,我认为他们的答案有所改善,因此我认为我会提出我的想法,以防它对其他人有帮助。
请注意,它只能在iOS4或更高版本中使用,因为它正在使用块。
UIView + AnimateHidden.m
#import \"UIView+AnimateHidden.h\"
@implementation UIView (AnimateHidden)
- (void)setHidden:(BOOL)hidden animated:(BOOL)animated
{
// If the hidden value is already set,do nothing
if (hidden == self.hidden) {
return;
}
// If no animation requested,do the normal setHidden method
else if (animated == NO) {
[self setHidden:hidden];
return;
}
else {
// Store the view\'s current alpha value
CGFloat origAlpha = self.alpha;
// If we\'re unhiding the view,make it invisible initially
if (hidden == NO) {
self.alpha = 0;
}
// Unhide the view so we can see the animation
self.hidden = NO;
// Do the animation
[UIView animateWithDuration:0.5
delay:0.0
options: UIViewAnimationOptionCurveEaseOut
animations:^{
// Start animation block
if (hidden == YES) {
self.alpha = 0;
}
else {
self.alpha = origAlpha;
}
// End animation block
}
completion:^(BOOL b){
// Start completion block
// Finish up by hiding the view if necessary...
self.hidden = hidden;
// ... and putting back the correct alpha value
self.alpha = origAlpha;
// End completion block
}];
}
}
@end
, 由于这些答案有些混乱,因此我认为我可以发布此API的简约设计。我还添加了延迟和持续时间-为什么不这样做。
在实现中,我们有。
#import \"UIView+AnimateHidden.h\"
@implementation UIView (AnimateHidden)
- (void)setHiddenAnimated:(BOOL)hide
delay:(NSTimeInterval)delay
duration:(NSTimeInterval)duration {
[UIView animateWithDuration:duration
delay:delay
options:UIViewAnimationOptionAllowAnimatedContent
animations:^{
if (hide) {
self.alpha = 0;
} else {
self.alpha = 0;
self.hidden = NO; // We need this to see the animation 0 -> 1
self.alpha = 1;
}
} completion:^(BOOL finished) {
self.hidden = hide;
}];
}
@end
在头文件中。
#import <UIKit/UIKit.h>
@interface UIView (AnimateHidden)
- (void)setHiddenAnimated:(BOOL)hide
delay:(NSTimeInterval)delay
duration:(NSTimeInterval)duration;
@end
, 如果您希望使用更复杂的动画类型或UIView不支持的动画,则使用另一个版本
- (void)setHidden:(BOOL)hidden withAnimationDuration:(NSTimeInterval)duration
{
CATransition* transition = ({
CATransition* its = [CATransition animation];
its.duration = duration;
its.timingFunction =
[CAMediaTimingFunction
functionWithName: kCAMediaTimingFunctionEaseInEaseOut];
its.type = kCATransitionPush;
its.subtype = (hidden ? @\"fromBottom\" : @\"fromTop\");
its
});
UIView* containerView = self.superview;
[containerView.layer removeAllAnimations];
[containerView.layer addAnimation: transition forKey: kCATransition];
self.hidden = hidden;
if (!hidden) {
[self.superview bringSubviewToFront: self];
}
}
, 这是我用来在“显示更多... \”和“显示较少... \”按钮单击时对视图“增长”和“收缩”建模的代码。模仿Palyancodr的答案
这种方法使我可以在情节提要中创建两个视图,以便约束可以在不同的iOS设备上按预期工作,并且我不需要自定义代码所有约束。
@IBAction func showMoreOrLessAction(_ sender: Any) {
// if small view showing
if showMoreLargeView.isHidden {
showMoreSmallView.isHidden = true
//showMoreLargeView.isHidden = false
UIView.animate(withDuration: 0.2,animations: {
self.showMoreLargeView.alpha = 1 // Here you will get the animation you want
},completion: { _ in
self.showMoreLargeView.isHidden = false // Here you hide it when animation done
})
}
else { // large view showing
//showMoreSmallView.isHidden = false
UIView.animate(withDuration: 0.2,animations: {
self.showMoreSmallView.alpha = 1 // Here you will get the animation you want
},completion: { _ in
self.showMoreSmallView.isHidden = false // Here you hide it when animation done
})
showMoreLargeView.isHidden = true
}
}