在目标 c 中, 我是否应该覆盖初始化变量的初始化方法? 如果变量是属性, 我仍然可以用通常的方式访问这些变量, 来设定它们的初始值?
在目标c中,我是否应该覆盖初始化变量的初始化方法?
是,具体地说,指定初始化器。
您的子类还可以指定另一个构建阶段( 例如查看过Load ) 。 另外, 对象的内存在分配时为零, 所以您不需要将其明确设定为 0/ nil (除非您发现它更易读) 。
如果变量是属性, 我仍然可以用通常的方式访问它们, 以设定它们的初始值?
您应该避免使用对象实例方法/ 访问器, 避免直接在部分构造状态( 特别是初始化器和交易器) 中访问 ivars。 您想要避免的副作用有多种 - < a href=" https:// stackoverflow. com/ questions/5932677/ 初始化- a- property- dot- notation/ 5932733# 5932733" > 这里的例子 < /a > ;
您可以在视图控制器的Load 方法下初始化变量。
类别界面中宣布的变量将自动初始化为默认值, 完整值为 0, 类别和指点为 N/ NULLL 。 如果您需要将变量初始化为其他值, 您则需要推翻您所属的保障切入点。 例如, 一个自定义类继承 NSBject / code > 。 例如, 您将简单覆盖 < code> > init 。 如果您在一个从 < code> > NIB < / code > 文件装入的查看控制器操作中工作, 那么您可以覆盖 initOncoder: 或 < a href="https:// developerer. applebraryrary/mac/ documentation/ CocoferenceKit/Propermes/ / NSNibrefar_ reference > 。 html / applepplex_ redustroy you a firal firal first it a sual devidustrate doal supdustration you.
我是否应该覆盖初始化变量的初始化方法?
实例变量:是的,尽管它们已默认为 0/nil/false 。
如果变量是属性, 我仍然可以用通常的方式访问它们, 以设定它们的初始值?
是的,你可以。苹果会建议反对它,因为一个子类可能推翻了设置的存取器来做一些意外的事情。实际上,这很少是一个问题。
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