ios - 动画从中心向边缘展开，下面露出parentView

Question

我添加了一个 UIView(其中包含一个 UIVisualEffectView - 模糊)作为另一个 View 的 subview 。我想以径向方式从中心向外向边缘设置 subview 的动画，就像一个扩大的圆圈。这应该在下面显示它的 superView。

这是我的代码:

self.blurView =  [[UIView alloc]initWithFrame:CGRectMake(0, 0, self.view.bounds.size.width, imageHeight)];
[superView addSubview: self.blurView];
UIVisualEffect *blurEffect = [UIBlurEffect effectWithStyle:UIBlurEffectStyleLight];
UIVisualEffectView *visualEffectView = [[UIVisualEffectView alloc] initWithEffect:blurEffect];
visualEffectView.frame = self.blurView.bounds;
[self.blurView addSubview:visualEffectButtonView];

Answer 1

[UIView animateWithDuration:3.0 delay:0 options:UIViewAnimationOptionCurveLinear  animations:^{
        //code with animation
        self.blurView.frame = CGRectMake(self.blurView.frame.origin.x, 
                    -self.blurView.frame.size.height, 
                    self.blurView.frame.size.width, 
                    self.blurView.frame.size.height);
    } completion:^(BOOL finished) {
        //code for completion
        [self.blurView removeFromSuperview];
    }];