Method Swizzle on iPhone device
I tried both JRSwizzle, and MethodSwizzle. They compile f开发者_运维知识库ine 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
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.
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