This is a linked set of objects that, for the most part, goes backward up through the view hierarchy.

响应者链是一组对象链接集，多数部分是通过视图层次结构向上延伸的。

youdao

This is a linked set of objects that, for the most part, goes backward up through the view hierarchy.

响应者链是一组对象链接集，多数部分是通过视图层次结构向上延伸的。

youdao