在- (BOOL)application:(UIApplication )application didFinishLaunchingWithOptions:(NSDictionary )launchOptions 里添加

self.window.rootViewController.view.alpha = 0; 
UIImageView *splashImageView = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"splash"]]; 
[self.window addSubview:splashImageView]; 
[UIView animateWithDuration:0.7 animations:^{ 
    self.window.rootViewController.view.alpha = 1.0; 
} completion:^(BOOL finished) { 
    [addSubview:splashImageView removeFromSuperview]; 
}];