如何在iOS上调整类方法？ [英] How to swizzle a class method on iOS?

问题描述

方法调配对于实例方法非常有用。现在，我需要调整一个类方法。知道怎么做吗？

Method swizzling works great for instance methods. Now, I need to swizzle a class method. Any idea how to do it?

试过这个但是不起作用：

Tried this but it doesn't work:

void SwizzleClassMethod(Class c, SEL orig, SEL new) {

Method origMethod = class_getClassMethod(c, orig);
Method newMethod = class_getClassMethod(c, new);

if(class_addMethod(c, orig, method_getImplementation(newMethod), method_getTypeEncoding(newMethod)))
    class_replaceMethod(c, new, method_getImplementation(origMethod), method_getTypeEncoding(origMethod));
else
    method_exchangeImplementations(origMethod, newMethod);
}

推荐答案

原来，我不是'很远的地方。这个实现对我有用：

Turns out, I wasn't far away. This implementation works for me:

void SwizzleClassMethod(Class c, SEL orig, SEL new) {

    Method origMethod = class_getClassMethod(c, orig);
    Method newMethod = class_getClassMethod(c, new);

    c = object_getClass((id)c);

    if(class_addMethod(c, orig, method_getImplementation(newMethod), method_getTypeEncoding(newMethod)))
        class_replaceMethod(c, new, method_getImplementation(origMethod), method_getTypeEncoding(origMethod));
    else
        method_exchangeImplementations(origMethod, newMethod);
}

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