尹一下app的头文件
AppDelegate * app = (AppDelegate *)[UIApplication sharedApplication].delegate;
UIWindow *window = app.window;
[UIView animateWithDuration:0.5 animations:^{
window.alpha = 0.0;
window.frame = CGRectMake(0, window.bounds.size.width, 0, 0);
} completion:^(BOOL finished) {
exit(0);
}];
