定义要用于注册在其中获得或失去焦点的事件的委托。
通过此委托可以在实现不使用 MonoBehviour 命名空间的代码时接收焦点更改事件。 注意:在使用 MonoBehviour 命名空间的代码中使用此委托注册焦点更改事件时,如果实现了 MonoBehaviour.OnApplicationFocus 方法,则还会从该方法接收事件。
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