如果这个property是 BOOL on,
那么Objc默认创建的 setter 为: - (void)on:(BOOL)setOn { }
getter 为: - (BOOL)on { return on; }
但是你可以手动更改 setter 和 getter 方法,
就像上面的: getter = xxxOn 的话,
getter 就变为: - (BOOL)xxxOn { return on; }
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