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01·iOS 面试题·项目中用过 Runtime 吗？
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我们知道静态语言在编译时期，就已经确定了函数的具体调用，而动态语言要等到运行时期才能真正确定调用哪个函数； Objective-C 是一门动态语言，它是通过 Runtime 这个运行时机制来实现的。
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