xcode 如何使用动画取消隐藏视图
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How to unhide view with animations
提问by Snowman
Say I have a hidden view in Xcode for iOS. Now, when I set the view to not hidden (view.hidden=NO), how can I make it so that it now appears, but with animations?
假设我在 Xcode for iOS 中有一个隐藏视图。现在，当我将视图设置为不隐藏（view.hidden=NO）时，我怎样才能让它现在出现，但带有动画？
回答by mrueg
What you probably want is not to set view.hidden, but to set view.alphato 0(corresponds to hidden = YES) or 1 (hidden = NO).
您可能想要的不是设置view.hidden，而是设置view.alpha为0（对应于hidden = YES）或 1 ( hidden = NO)。
You can then use implicit animations to show the view, e.g
然后您可以使用隐式动画来显示视图，例如
[UIView animateWithDuration:0.3 animations:^() {
view.alpha = 1.0;
}];
回答by Abhi
If you want other animations than only fading then use this method
如果您想要其他动画而不仅仅是淡入淡出，请使用此方法
[UIView transitionWithView:_yourView duration:1.0 options:UIViewAnimationOptionTransitionCurlDown animations:^(void){
[_yourView setHidden:NO];
} completion:nil];
回答by Benjamin Mayo
For a fade, you can adjust the alpha property of the view.
对于淡入淡出，您可以调整视图的 alpha 属性。
myView.alpha = 0;
[UIView animateWithDuration:0.5 animations:^{
myView.alpha = 1;
}];
That will apply a fade in over 0.5 seconds to the view myView. Many UIView properties are animatable; you aren't just limited to alpha fades. You can change background colours, or even rotate and scale a view, with animation. If you need further control and advanced animation, you can then move into Core Animation - a much more complex animation framework.
这将在 0.5 秒内对视图应用淡入淡出myView。许多 UIView 属性是可动画的；您不仅限于 alpha 淡入淡出。您可以使用动画更改背景颜色，甚至旋转和缩放视图。如果您需要进一步的控制和高级动画，您可以进入 Core Animation——一个更复杂的动画框架。
回答by Praveen-K
-(void)showView{
[UIView beginAnimations: @"Fade Out" context:nil];
[UIView setAnimationDelay:0];
[UIView setAnimationDuration:.5];
//show your view with Fade animation lets say myView
[myView setHidden:FALSE];
[NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(hideView) userInfo:nil repeats:YES];
[UIView commitAnimations];
}
-(void)hideView{
[UIView beginAnimations: @"Fade In" context:nil];
[UIView setAnimationDelay:0];
[UIView setAnimationDuration:.5];
//hide your view with Fad animation
[myView setHidden:TRUE];
[UIView commitAnimations];
}
OR you can try this way
或者你可以试试这种方式
self.yourView.alpha = 0.0;
[UIView beginAnimations:@"Fade-in" context:NULL];
[UIView setAnimationDuration:1.0];
self.yourView.alpha = 1.0;
[UIView commitAnimations];
