IOS启动页动画（uiview 淡入淡出效果 )2

Appdelegate里面右个这个函数，只要它没结束，你的等待界面就不会消失。
以在启动的时候做些动画

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

// Override point for customization after application launch.

[window addSubview:viewController.view];

[self.window makeKeyAndVisible];

//装载启动页的视图
imgview=[[UIImageView alloc]initWithFrame:self.window.frame];
imgview.image=[UIImage imageNamed:@"Default"];
imgview.alpha = 0.0;
[bgView addSubview:imgview];

//动画--淡入
[UIView beginAnimations:nil context:nil];//标记动画块开始
[UIView setAnimationCurve:UIViewAnimationCurveEaseIn];//定义动画加速和减速方式
[UIView setAnimationDuration:0.5];//动画时长
[UIView setAnimationDelegate:self];
imgview.alpha = 1.0;
//动画结束后回调方法
[UIView setAnimationDidStopSelector:@selector(showArrowDidStop:finished:context:)];
[UIView commitAnimations];//标志动滑块结束

return YES;

}

//动画--淡出
-(void)hiddenAnimation
{
[UIView animateWithDuration:0.5 animations:^{
imgview.alpha=0.0;
} completion:^(BOOL finished) {
[imgview removeFromSuperview];
[bgView removeFromSuperview];
}];
// [UIView beginAnimations:@"HideArrow" context:nil];
// [UIView setAnimationCurve:UIViewAnimationCurveEaseOut];
// [UIView setAnimationDuration:0.5];
// [UIView setAnimationDelay:1.0];
// imgview.alpha = 0.0;
// [UIView commitAnimations];
}

- (void)showArrowDidStop:(NSString *)animationID finished:(NSNumber *)finished context:(void *)context
{
[NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(hiddenAnimation) userInfo:Nil repeats:NO];
}