iOS 系统启动图获取

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];







            }];