iPhone上实现Default.png动画

原理：  添加一张和Default.png一样的图片，对这个图片进行动画，从而实现Default动画的渐变消失的效果。  操作：  在- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions中添加如下代码：  // Make this interesting.    UIImageView *splashView = [[UIImageView alloc] initWithFrame:CGRectMake(0,0, 320, 480)];      splashView.image = [UIImage imageNamed:@"Default.png"];      [self.window addSubview:splashView];      [self.window bringSubviewToFront:splashView];      [UIView beginAnimations:nil context:nil];      [UIView setAnimationDuration:2.0];      [UIView setAnimationTransition:UIViewAnimationTransitionNone forView: self.window cache:YES];      [UIView setAnimationDelegate:self];       [UIView setAnimationDidStopSelector:@selector(startupAnimationDone:finished:context:)];      splashView.alpha = 0.0;      splashView.frame = CGRectMake(-60, -85, 440, 635);      [UIView commitAnimations];  就ok了