Then, when the function delegate is invoked the specified method of the specified instance is called.

接着，调用此函数委托时，将调用指定实例的指定方法。

youdao

Then, when the function delegate is invoked the specified method of the specified instance is called.

接着，调用此函数委托时，将调用指定实例的指定方法。

youdao