从顶部弹出视图的动画效果，当退出视图时调用[self leaveView]将视图弹出。

moveInAnimateUIView.m

#pragma mark - UIAnimation

- (void)willMoveToSuperview:(UIView *)newSuperview
{
    [self enterView];
}

#define ANIMATE_DURATION 0.3
- (void)enterView
{
    self.backgroundColor = [[UIColor darkGrayColor] colorWithAlphaComponent:0.0];

    CATransition *transition = [CATransition animation];
    transition.duration = ANIMATE_DURATION;
    transition.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
    transition.type = kCATransitionMoveIn;
    transition.subtype = kCATransitionFromBottom;
    [_mainView.layer addAnimation:transition forKey:nil];
    
    [UIView animateWithDuration:ANIMATE_DURATION animations:^{
        self.backgroundColor = [[UIColor darkGrayColor] colorWithAlphaComponent:0.85];
    }];
}

- (void)leaveView
{
    CATransition *transition = [CATransition animation];
    transition.duration = ANIMATE_DURATION;
    transition.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
    transition.type = kCATransitionReveal;
    transition.subtype = kCATransitionFromTop;
    transition.delegate = self;
    [_mainView.layer addAnimation:transition forKey:nil];
}

- (void)animationDidStart:(CAAnimation *)anim
{
    _mainView.alpha = 0.0;
    
    [UIView animateWithDuration:ANIMATE_DURATION animations:^{
        self.alpha = 0.0;
    }];
}

- (void)animationDidStop:(CAAnimation *)anim finished:(BOOL)flag
{
    [self removeFromSuperview];
}

#pragma mark -