IOS应用启动时渐变等待

 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
 {
     self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
     [UIApplication sharedApplication].statusBarHidden = YES;


     UIImageView *splashScreen = [[UIImageView alloc] initWithFrame:self.window.bounds];
     splashScreen.image = [UIImage imageNamed:@"程序进入图.png"];
     [self.window addSubview:splashScreen];

     [UIView animateWithDuration:5.0 animations:^{
         CATransform3D transform = CATransform3DMakeScale(0.5, 0.5, 1.0);
         splashScreen.layer.transform = transform;
         splashScreen.alpha = 0.8;
         MyLog(@"111");
     } completion:^(BOOL finished) {
         [splashScreen removeFromSuperview];
         MyLog(@"222");
         self.window.rootViewController = [[LoginViewController alloc]init];
         self.window.backgroundColor = [UIColor whiteColor];
            }];

     _netRequest = [[NetRequest alloc] init];

     [self.window makeKeyAndVisible];
     return YES;
 }