view 动画

[self
showInView:[self
view]];

- (void) showInView:(UIView*)view
{

// 1. Hide the modal
// [[self modalView] setAlpha:0];

// 2. Install the modal view
[[view superview]
addSubview:[self
view]];

_shrunkView = view;

[[self
view] setFrame:_shrunkView.frame];

// 3. Show the buttons
[[self
containerView] setTransform:CGAffineTransformMakeTranslation(0, [[self
containerView] frame].size.height)];

// 4. Animate everything into place
[UIView
animateWithDuration:0.3
animations:^{

// Shrink the main view by 15 percent
CGAffineTransform t =
CGAffineTransformScale(CGAffineTransformIdentity,
.9, .9);
[view setTransform:t];

// Fade in the modal
// [[self modalView] setAlpha:1.0];

// Slide the buttons into place
[[self
containerView] setTransform:CGAffineTransformIdentity];

}
completion:^(BOOL finished) {
_visible =
YES;
}];

}

- (void) hideInView
{

// 2. Animate everything out of place
[UIView
animateWithDuration:0.3
animations:^{

// Shrink the main view by 15 percent
CGAffineTransform t =
CGAffineTransformIdentity;
[_shrunkView
setTransform:t];

// Fade in the modal
// [[self modalView] setAlpha:0.0];

// Slide the buttons into place

t = CGAffineTransformTranslate(t,
0, [[self
containerView] frame].size.height);
[[self
containerView] setTransform:t];

}

completion:^(BOOL finished) {
// [[self modalView] removeFromSuperview];
_visible =
NO;
_shrunkView=nil;
// if ([self.delegate respondsToSelector:@selector(hideFinished)]) {
// [self.delegate hideFinished];
// }
}];

}