什么是objective-c中的协议

Question

可能重复:
什么是协议

喜

如何在Objective-c中使用协议？它的优点是什么？

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Answer 1

Protocols have many advantages. The idea is to provide a way for classes to share the same method and property declarations without inheriting them from a common ancestor. This is especially useful in Objective-C when using the delegation pattern, on which the iOS and Mac OS SDKs rely heavily. There's plenty of information out there on the subject, including a good overview in Apple's developer documentation.