1
我创建了一个NSURLConnection和NSURLSession类别，以便在调试时拦截呼叫并收集网络信息。 一切在大多数情况下，除了当我使用的NSURLConnectionSwizzle NSURLConnection sendAsynchronous：request：queue：completionHandler and sendSynchronousRequest：returningResponse：error：not working
sendAsynchronousRequest:queue:completionHandler:
sendSynchronousRequest:returningResponse:error:
这两个静态方法静态类方法的伟大工程，只是，虽然调试我看到这个方法的实现交换正在发生的事情不要在我混写服从正如其他方法，我swizzle。 这里是我的代码，类似于我对其他方法似乎工作得很好。
typedef void (^SendAsynchronousCompletionHandlerBlock)(NSURLResponse*, NSData*, NSError*);
static void (*OriginalNSURLConnectionSendAsynchronousRequestQueueCompletionHandler)(id, SEL, NSURLRequest*, NSOperationQueue*, SendAsynchronousCompletionHandlerBlock);
static NSData* (*OriginalNSURLConnectionSendSynchronousRequestReturningResponseError)(id, SEL, NSURLRequest*, NSURLResponse**, NSError**);
static void MyNSURLConnectionSendAsynchronousRequestQueueCompletionHandler(id self, SEL _cmd, NSURLRequest* request, NSOperationQueue* queue, SendAsynchronousCompletionHandlerBlock completionHandler)
{
NSLog(@"Implementation Intercept in %s", __PRETTY_FUNCTION__);
OriginalNSURLConnectionSendAsynchronousRequestQueueCompletionHandler(self, _cmd, request, queue, completionHandler);
}
static NSData* MyNSURLConnectionSendSynchronousRequestReturningResponseError(id self, SEL _cmd, NSURLRequest* request, NSURLResponse** response, NSError** error)
{
NSLog(@"Implementation Intercept in %s", __PRETTY_FUNCTION__);
NSData* data = OriginalNSURLConnectionSendSynchronousRequestReturningResponseError(self, _cmd, request, response, error);
return data;
}
@implementation NSURLConnection (MyNSURLConnection)
+ (void) load
{
// Create onceToken
static dispatch_once_t onceToken;
// Use dispatch_once to make sure this runs only once in the lifecycle
dispatch_once(&onceToken,
^{
NSLog(@"Injecting code to NSURLConnection");
[self injectImplementationToNSURLConnectionSendAsynchronousRequestQueueCompletionHandler];
[self injectImplementationToNSURLConnectionSendSynchronousRequestReturningResponseError];
// Some other methods I intercept, just as reference, they work as tested to init an NSURLConnection object
// I will skip their implementation which is similar to what I show here
[self injectImplementationToNSURLConnectionConnectionWithRequestDelegate];
[self injectImplementationToNSURLConnectionInitWithRequestDelegateStartImmediately];
[self injectImplementationToNSURLConnectionInitWithRequestDelegate];
[self injectImplementationToNSURLConnectionStart];
});
}
+ (void) injectImplementationToNSURLConnectionSendAsynchronousRequestQueueCompletionHandler
{
// Replace the method on the same class that's used
// in the calling code
Class class = [NSURLConnection class];
// The Original +sendAsynchronousRequest:queue:completionHandler:
SEL originalSelector = @selector(sendAsynchronousRequest:queue:completionHandler:);
// The Replacement method implementation
IMP replacement = (IMP)MyNSURLConnectionSendAsynchronousRequestQueueCompletionHandler;
// This will eventually hold the original sendAsynchronousRequest:queue:completionHandler:
IMP* store = (IMP*)&OriginalNSURLConnectionSendAsynchronousRequestQueueCompletionHandler;
IMP originalImp = NULL;
Method method = class_getClassMethod(class, originalSelector);
if (method)
{
const char* type = method_getTypeEncoding(method);
// Replace the original method with the MyNSURLConnectionSendAsynchronousRequestQueueCompletionHandler
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;
}
}
+ (void) injectImplementationToNSURLConnectionSendSynchronousRequestReturningResponseError
{
// Replace the method on the same class that's used
// in the calling code
Class class = [NSURLConnection class];
// The Original +sendSynchronousRequest:returningResponse:error: selector
SEL originalSelector = @selector(sendSynchronousRequest:returningResponse:error:);
// The Replacement method implementation
IMP replacement = (IMP)MyNSURLConnectionSendSynchronousRequestReturningResponseError;
// This will eventually hold the original sendSynchronousRequest:returningResponse:error:
IMP* store = (IMP*)&OriginalNSURLConnectionSendSynchronousRequestReturningResponseError;
IMP originalImp = NULL;
Method method = class_getClassMethod(class, originalSelector);
if (method)
{
const char* type = method_getTypeEncoding(method);
// Replace the original method with the MyNSURLConnectionSendSynchronousRequestReturningResponseError
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;
}
}
那么是什么让不同的这些方法，我不能有我的代码调配成原来的执行，并没有出现在任何方式错误。
这里是我测试的代码：
- (IBAction) executeURLRequest: (UIButton*)sender
{
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"https://My.URL/file.json"]];
[request setValue:@"API_KEY" forHTTPHeaderField:@"X-My-Auth-Token"];
NSURLResponse* response;
NSError* error;
// Doesn't work, my swizzle method is not invoked
[NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];
// Doesn't work, my swizzle method is not invoked
[NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue currentQueue] completionHandler:
^(NSURLResponse *response, NSData *data, NSError *error)
{
if (error) NSLog(@"NSURLConnection failed: %@", [error debugDescription]);
NSLog(@"Made the NSURLRequest to My");
}];
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_LOW, 0),
^{
// It works, I get to see my message of the method invoked to the output console
NSURLConnection* connection = [[NSURLConnection alloc] initWithRequest:request delegate:nil startImmediately:YES];
});
}
我不知道，它看起来相当好，我...你有什么感想？
是的，这个实现工作，我可以看到你的代码和我的区别是，你得到原始的实现与gOrigNSURLConnection_sendAsynchronousRequestQueueCompletionHandler =（void *）method_getImplementation（origMethod）;我为同步版本做了同样的工作，它也可以工作。因为现在所有其他部分按预期工作，所以我现在将继续执行其余的实施。如果可能的话，请为我的知识库解释。 –