App直接退出回到主界面（非闪退，非崩溃）

之前在群里看到有人问，不使用Home键，在应用中怎么让应用退出回到桌面，用闪退方法退出很容易但毕竟体验不好，之后看了几篇博客说添加个动画调用exit函数，然后试了一下效果是比闪退好，如果有更好的方法欢迎指教....


方法一、

- (void) ExitApp {
    AppDelegate *app = (AppDelegate *)[UIApplication sharedApplication].delegate;
    UIWindow *window = app.window;
    [UIView animateWithDuration:0.5f animations:^{
        window.alpha = 0.2;
        self.view.frame = CGRectMake([UIScreen mainScreen].bounds.size.width, [UIScreen mainScreen].bounds.size.height*0.7, 0, 0);
    } completion:^(BOOL finished) {
        exit(0);
    }];
}

方法二、

- (void) ExitApp {
    [UIView beginAnimations:@"exitApplication" context:nil];
    [UIView setAnimationDuration:0.5];
    [UIView setAnimationDelegate:self];
    [UIView setAnimationTransition:UIViewAnimationTransitionFlipFromRight  forView:self.view.window cache:NO];
    [UIView setAnimationDidStopSelector:@selector(animationFinished:finished:context:)];
    [UIView commitAnimations];
}
/**
 *  退出APP代码
 *  @param animationID animationID
 */
- (void)animationFinished:(NSString *)animationID finished:(NSNumber *)finished context:(void *)context {
    if ([animationID compare:@"exitApplication"] == 0) {
        exit(0);
    }
}