iOS 仿安卓平滑退出应用或进程退出(exit、_exit、ab

AppDelegate *app = [UIApplication sharedApplication].delegate;
    UIWindow *window = app.window;
        [UIView animateWithDuration:1.0f animations:^{
            window.alpha =0;
            window.frame = CGRectMake(0, window.bounds.size.width, 0, 0);
        } completion:^(BOOL finished) {
          exit(0);
        }];
    return;