swizzling

Method swizzling works great for instance methods. Now, I need to swizzle a class method. Any idea how to do it? 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); } Turns out, I wasn't far away. This

How can I implement method swizzling in Swift 3.0 ? I've read nshipster article about it, but in this code's chunk struct Static { static var token: dispatch_once_t = 0 } the compiler gives me an error dispatch_once_t is unavailable in Swift: Use lazily initialized globals instead Tikhonov Alexander First of all dispatch_once_t is unavailable in Swift 3.0. You can choose from two alternatives: Global variable Static property of struct , enum or class For more details, see that Whither dispatch_once in Swift 3 For different purposes you must use different implementation of swizzling Swizzling

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 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,