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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
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Method swizzling is the process of replacing the implementation of a function at runtime. Swift, as a static, strongly typed language, did not previously have any built-in mechanism that would allow to dynamically change the implementation of a function.
Method swizzling in Firebase Cloud Messaging Developers who prefer not to use swizzling can disable it by adding the flag FirebaseAppDelegateProxyEnabled in the app's Info. plist file and setting it to NO (boolean value).
Swizzling (other languages call this “monkey patching”) is the process of replacing a certain functionality or adding custom code before the original code is called. For example, you could swizzle UIViewController. viewDidAppear to be informed whenever a view controller is displayed.
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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