Method Swizzle on iPhone device

Question

I tried both JRSwizzle, and MethodSwizzle. They compile fine on the simulator but throw a bunch of errors when I try to compile for Device (3.x)

Has anyone had any luck swizzling on the iphone? Whats the trick?

TIA

Answer 1

The CocoaDev wiki has an extensive discussion on method swizzling here. Mike Ash has a relatively simple implementation at the bottom of that page:

#import <objc/runtime.h>  #import <objc/message.h> //....  void Swizzle(Class c, SEL orig, SEL new) {     Method origMethod = class_getInstanceMethod(c, orig);     Method newMethod = class_getInstanceMethod(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); } 

I have not tested this, simply because I regard method swizzling as an extremely dangerous process and haven't had the need to use it yet.