Launch Image消失时添加动画

CGSize viewSize = self.window.bounds.size;
NSString *viewOrientation = @"Portrait";    //横屏请设置成 @"Landscape"
NSString *launchImage = nil;

NSArray* imagesDict = [[[NSBundle mainBundle] infoDictionary] valueForKey:@"UILaunchImages"];
for (NSDictionary* dict in imagesDict)
{
    CGSize imageSize = CGSizeFromString(dict[@"UILaunchImageSize"]);

    if (CGSizeEqualToSize(imageSize, viewSize) && [viewOrientation isEqualToString:dict[@"UILaunchImageOrientation"]])
    {
        launchImage = dict[@"UILaunchImageName"];
    }
}

UIImageView *launchView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:launchImage]];
launchView.frame = self.window.bounds;
launchView.contentMode = UIViewContentModeScaleAspectFill;
[self.window addSubview:launchView];

[UIView animateWithDuration:2.0f
                      delay:0.0f
                    options:UIViewAnimationOptionBeginFromCurrentState
                 animations:^{

                     launchView.alpha = 0.0f;
                     launchView.layer.transform = CATransform3DScale(CATransform3DIdentity, 1.2, 1.2, 1);

                 }
                 completion:^(BOOL finished) {

                     [launchView removeFromSuperview];

                 }];