由于目前苹果没有支持该功能，所以只能自己在App启动后做一个过度效果：
[cpp]
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
// Override point for customization after application launch.
self.viewController = [[[ViewController alloc] initWithNibName:@"ViewController" bundle:nil] autorelease];
self.window.rootViewController = self.viewController;
[self.window makeKeyAndVisible];
UIImageView *splashScreen = [[[UIImageView alloc] initWithFrame:self.window.bounds] autorelease];
splashScreen.image = [UIImage imageNamed:@"Default"];
[self.window addSubview:splashScreen]; www.2cto.com
[UIView animateWithDuration:1.0 animations:^{
CATransform3D transform = CATransform3DMakeScale(1.5, 1.5, 1.0);
splashScreen.layer.transform = transform;
splashScreen.alpha = 0.0;
} completion:^(BOOL finished) {
[splashScreen removeFromSuperview];
}];
return YES;
}
其实我觉得这个功能最好是用在两个界面进行切换时使用，而且其中的黑屏效果如果使用view.backgroundcolor=[uicolor blackcolr];这样就不需要一个图片来做这种切换效果，速度更快，占空间更小。