iOS Development Tips-The get-to-go skills in parent-child controller exercises, controlling the range of core animations

One, the non-processed animations are like this, and the custom navigation buttons are then turned together.

Second, the effect I want

Third, the idea of achieving this effect: the core animation to be added to the view layer above, the beginning of the situation is to say that the core animation is added to the entire large view layer above. To achieve the desired effect, use a view (called Contentview) to animate the view package, and the core animation is added to the Contentview.

iOS Development Tips-The get-to-go skills in parent-child controller exercises, controlling the range of core animations