动画弹出半透明层

// Initialization code

        self.backgroundColor = [UIColorclearColor];

        _mainWindow = [UIApplicationsharedApplication].keyWindow;

        _overlayWindow = [[UIWindow alloc] initWithFrame:SCREENBOUND];

        _overlayWindow.windowLevel = UIWindowLevelStatusBar;

        _overlayWindow.userInteractionEnabled = NO;

        _overlayWindow.backgroundColor = [UIColorcolorWithWhite:0.0falpha:0.0f];

        _overlayWindow.hidden = YES;

        [_overlayWindowmakeKeyWindow]; 

 

- (void)show

{

    _overlayWindow.hidden = NO;

    [UIViewanimateWithDuration:kDuration*1.5f

                          delay:0.0f

                        options:UIViewAnimationOptionCurveEaseOut

                     animations:^(){

                         _overlayWindow.backgroundColor = [UIColor colorWithWhite:0.0f alpha:0.35f];

                    }

                     completion:^(BOOL finished){

                         

                     }];

}

- (void)hide

{

    

    [UIViewanimateWithDuration:kDuration*1.5f

                          delay:0.0f

                        options:UIViewAnimationOptionCurveEaseOut

                     animations:^(){

                         _overlayWindow.backgroundColor = [UIColor colorWithWhite:0.0f alpha:0.0f];

                     }

                     completion:^(BOOL finished){

                         _overlayWindow.hidden = YES;

                     }];

 

}

 

- (void)showInView:(UIView *) view

{

    [self show];

    [view addSubview:_overlayWindow];

    

    CATransition *animation = [CATransition  animation];

    animation.delegate = self;

    animation.duration = kDuration;

    animation.timingFunction = [CAMediaTimingFunctionfunctionWithName:kCAMediaTimingFunctionEaseInEaseOut];

    animation.type = kCATransitionPush;

    animation.subtype = kCATransitionFromTop;

    [self setAlpha:1.0f];

    [self.layer addAnimation:animation forKey:@"DDLocateView"];

    

    self.frame = CGRectMake(0, view.frame.size.height - self.frame.size.height, self.frame.size.width, self.frame.size.height);

    

    

    [view addSubview:self];

 

}