Trouble hooking a class method

[lukestringer90]

I'm am trying to swizzle a class method which ordinarily returns a singleton instance of a AFHTTPSessionManager subclass. My class is as follows:

@interface WebServiceClient : AFHTTPSessionManager

+ (instancetype)sharedClient;

@implementation WebServiceClient

+ (instancetype)sharedClient {
    static WebServiceClient *_sharedClient = nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        _sharedClient = ...; // setup here
    });

    return _sharedManager;
}

@end

I am swizzling like this:

WebServiceClient *webServiceClient = ...; // setup here
NSError *error;
[WebServiceClient aspect_hookSelector:@selector(sharedClient)
                          withOptions:AspectPositionInstead
                           usingBlock:^(id<AspectInfo> info) {
                               NSInvocation *invocation = info.originalInvocation;
                               [invocation setReturnValue:&webServiceClient];
                          } error:&error];

The error gives the following description:

Aspects: Blog signature <NSMethodSignature: 0x8e2bec0> doesn't match (null).

Any ideas what I am doing wrong? Thanks for the great library, I think I am going to be using it a lot in my unit tests to simplify dependency injection.

[steipete]

Oh we don't yet support hooking class-methods. Might come in the future !

[lukestringer90]

That's fine, thanks for the clarification. Keep up the good work :)

[steipete]

Hey I added that feature and made it even cooler! Just return the object instead of fighting with the invocation.

[WebServiceClient aspect_hookSelector:@selector(sharedClient)
                          withOptions:AspectPositionInstead
                           usingBlock:^id {
                                    return webServiceClient;
                              } error:&error];

[lukestringer90]

Awesome. You sir are a legend!

[steipete]

Ha, thanks! Right now it's just on a branch, since we don't yet have 64bit simulator support, but that will come soon, once I prep up my assembly-foo :)