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Objective-C小技巧 (Builder - Command - Protected)
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当我们在设计一个类时，我们期望类属性的值由外部调用者传入，但是我们希望这个值仅在初始化设置，在初始化之后外部调用者修改这个值会导致状态混乱。或者干脆一个类具备大量外部可access的属性，调用者在使用这个类时会感觉比较茫然，需要一定的学习成本才能明白这个类设计的意图。
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