如何在iOS中显示/隐藏带动画的UIView？

Question

主UIView包含两个子视图 - UIView_1和UIView_2.
在UIView_2,有一个按钮来显示或隐藏UIView_1.
例如,当用户触摸所述按钮显示UIView_1,然后UIView_1将向下滑动,并UIView_2将与过渡向下推.
我对动画知之甚少.有人可以给我看一些示例代码供参考吗？
我应该使用CGAffineTransformMakeTranslation吗？
谢谢.

Answer 1

你不需要那么复杂的东西.只需更改视图的帧大小即可.

    NSTimeInterval animationDuration = /* determine length of animation */;
    CGRect newFrameSize = /* determine what the frame size should be */;
    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationDuration:animationDuration];
    theViewToChange.frame = newFrameSize;
    [UIView commitAnimations];

Answer 2

简单地隐藏/显示fadein/out效果`

/ 显示 /

sliderView.hidden = NO;
sliderView.alpha = 0.1;
[UIView animateWithDuration:0.25 animations:^{
    sliderView.alpha = 1.0f;
} completion:^(BOOL finished) {
    // do some
}];

/ 隐藏 /

[UIView animateWithDuration:0.25 animations:^{
    sliderView.frame =  CGRectMake(130, 30, 0, 0);
    [sliderView setAlpha:0.1f];
} completion:^(BOOL finished) {
    sliderView.hidden = YES;
}];

`