子视图动画显示为POPView

Question

我试图像pop视图一样显示subView动画，但我只知道这样：

twobuttonView = [[UIView alloc] init];
twobuttonView.frame = CGRectMake(300, 60, 80, 100);
[self.view addSubview:twobuttonView];

[UIView animateWithDuration:0.8
                 animations:^{
                     twobuttonView.frame = CGRectMake(220, 50, 100, 80); // its final location
                 }];
twobuttonView.backgroundColor = [UIColor whiteColor];

但我需要这样：