mikeash.com pyblog/friday-qa-2012-06-01-a-tour-of-plweakcompatibility-part-ii.html comments

bob - 2013-01-17 11:29:53

Thu, 17 Jan 2013 11:29:53 GMT

Instead of pthread thread local storage, why not use [[NSThread currentThread] threadDictionary]?

mikeash - 2012-07-19 14:04:30

Thu, 19 Jul 2012 14:04:30 GMT

You'd capture the class in the block and look up the IMP with it in the block, something like:



^(PLObjectPtr obj) {

    // do some work here

    

    // now call super

    Class superclass = class_getSuperclass(c);

    void (*origIMP)(PLObjectPtr, SEL) = (__typeof__(origIMP))class_getMethodImplementation(superclass, releaseSELSwizzled);

    origIMP(self, _cmd);

};

Since 'c' is captured by the block rather than looked up at runtime, it's always consistent, and 'superclass' is always correct.

Mike - 2012-07-16 13:18:49

Mon, 16 Jul 2012 13:18:49 GMT

Hey I am new to iOS development. Just curios as to how you would swizzle a method safely in both super and sub using imp_implementationWithBlock?