1. 文章写得很棒。
    虽是为说明问题,但文中的单例定义无法避免用 [Printer alloc]; 创建多个对象。 

    1. Author

      的确是无法避免多个对象得创建,不过这应该是Objective C语言得特性:方法无法隐藏。就像NSBundle,应该是只用mainBundle。所以只能写个注释:“Danger, do not call this method, otherwise you will be fired.”

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