iOS启动屏后再加个闪屏的方法

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {  
    self.window.rootViewController.view.alpha = 0;  
  _splashImageView = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"Default"]];  
    _splashImageView.frame = [UIScreen mainScreen].bounds;  
    [self.window addSubview:_splashImageView];  
    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(2 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{  
            [UIView animateWithDuration:0.5 animations:^{  
                self.window.rootViewController.view.alpha = 1.0;  
            } completion:^(BOOL finished) {  
                [_splashImageView removeFromSuperview];  
            }];  
    });  
    return YES;  
}  

自定义图片加载，延时时间，以及动画收回时间。

转载http://www.starming.com/index.php?v=index&view=21