How to if Using delegate instead of block

[ekingo]

most of the times, use NSURLSession to send request with Delegate instead of block. so the completionHandler is nil, and there is no way to enter the notify block.

[ekingo]

• (void) injectImplementationToNSURLSession { // Replace the method on the same class that's used // in the calling code Class class = [NSURLSession class];

// The Original NSURLSession selector
SEL originalSelector = @selector(sessionWithConfiguration:delegate:delegateQueue:);

// The Replacement method implementation
IMP replacement = (IMP)XplatNSURLSessionWithConfigurationDelegateAndQueue;

// This will eventually hold the original sessionWithConfiguration:delegate:delegateQueue:
IMP* store = (IMP*)&OriginalNSURLSessionWithConfigurationDelegateAndQueue;

IMP originalImp = NULL;
Method method = class_getClassMethod(class, originalSelector);
if (method)
    {
    const char* type = method_getTypeEncoding(method);
    // Replace the original method with the XplatNSURLSessionWithConfigurationDelegateAndQueue
    originalImp = class_replaceMethod(class, originalSelector, replacement, type);
    if (!originalImp)
        {
        originalImp = method_getImplementation(method);
        }
    }

// Put the original method IMP into the pointer
if (originalImp && store)
    {
    *store = originalImp;
    }
}

It should :

class_getInstanceMethod