展示＆amp;用动画隐藏UIButton

Question

我如何才能使UIButton从视图中慢慢消失？我正在寻找的动画会使按钮看起来像它的宽度向下。我应该使用Core Animation吗？我对iPhone开发很陌生，但这似乎应该是可行的

Answer 1

使用UiView并将按钮放在上面...然后将动画添加到Uiview ...你想要什么

   UIView *upwardView=[[UIView alloc]init];
   upwardView.backgroundColor=[UIColor blueColor];
[upwardView setFrame:CGRectMake(0, 10, 320, 200)];


UIButton *btn=[UIButton buttonWithType:UIButtonTypeRoundedRect];
[btn setTitle:@"Click me" forState:UIControlStateNormal];
btn.frame=CGRectMake(10, 20, 120, 40);
[upwardView addSubview:btn];

CATransition *animation = [CATransition animation];
[animation setType:kCATransitionPush];
[animation setSubtype:kCATransitionFade];
[animation setDuration:.50];
[animation setDelegate:self];
[animation setTimingFunction:[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut]];
CALayer *layer = [upwardView layer];
[layer addAnimation:animation forKey:nil];
[self.view.window addSubview:upwardView];

不要忘记导入QuartzCore / QuartzCore框架

Answer 2

似乎只是想通过使用UIView的类方法animateWithDuration:animations:

来设置框架（或精确地，中心位置）的更改动画

[UIView animateWithDuration:<some duration> animations:^{
    myButton.center = (CGPoint){myButton.center.x, CGRectGetMaxY(self.view.frame) + (CGRectGetHeight(myButton.bounds)/2.0)};
}];

CoreAnimation对于这个简单的操作来说太过分了。