如何从其他地方调用 Objective-C 对象超类的方法？
如果您正在实现一个子类，您可以在您的实现中显式调用超类的方法，即使您已经覆盖了该方法，即：
[self overriddenMethod]; //calls the subclass's method
[super overriddenMethod]; //calls the superclass's method
如果您想从子类实现之外的某个地方调用超类的方法，即：
[[object super] overriddenMethod]; //crashes
这可能吗？通过扩展，是否有可能在实现中上升不止一个级别，即：
[[super super] overriddenMethod]; //will this work?
If you're implementing a subclass, you can, within your implementation, explicitly call the superclass's method, even if you've overridden that method, i.e.:
[self overriddenMethod]; //calls the subclass's method
[super overriddenMethod]; //calls the superclass's method
What if you want to call the superclass's method from somewhere outside the subclass's implementation, i.e.:
[[object super] overriddenMethod]; //crashes
Is this even possible? And by extension, is it possible to go up more than one level within the implementation, i.e.:
[[super super] overriddenMethod]; //will this work?
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一个更令人愉快的选择（用于调试）是添加一个为您执行此操作的类别方法：
事实上，没有更方便的方法来执行此操作，这很大程度上是设计使然。
A more pleasant option (for debugging) is to add a category method which does it for you:
The fact that there’s no more convenient way to do this is very much by design.
如果您愿意，您可以发送
[[[object class] superclass] methodForSelector: ...]并直接通过 IMP 指针调用...但如果您这样做，可能会出现一些非常严重的情况您的应用程序的设计有问题。You can send
[[[object class] superclass] methodForSelector: ...]and invoke through the IMP pointer directly, if you want... but if you're doing this, there's probably something very wrong with your application's design.