問題

要對第三方廠商SDK的.a靜態(tài)庫中某些網(wǎng)絡(luò)請求進(jìn)行替換操作

解決方案

1. 因?yàn)榈谌綇S商SDK中的網(wǎng)絡(luò)請求框架不對外開放，所以通過對.a庫使用Hopper Disassembler進(jìn)行分析，定位到是使用什么函數(shù)進(jìn)行請求

2. 建立一個(gè)方法，對.a中的網(wǎng)絡(luò)框架方法進(jìn)行swizzling

   Class systemClass = NSClassFromString(@"XXXNetURLSessionManager");
    
    SEL sel_System = @selector(dataTaskWithRequest:uploadProgress:downloadProgress:completionHandler:);
    SEL sel_Custom = @selector(hook_dataTaskWithRequest:uploadProgress:downloadProgress:completionHandler:);
    
    Method method_System = class_getInstanceMethod(systemClass, sel_System);
    Method method_Custom = class_getInstanceMethod([self class], sel_Custom);
    
    IMP imp_System = method_getImplementation(method_System);
    IMP imp_Custom = method_getImplementation(method_Custom);
    
    if (class_addMethod(systemClass, sel_Custom, imp_System, method_getTypeEncoding(method_System))) {
        class_replaceMethod(systemClass, sel_System, imp_Custom, method_getTypeEncoding(method_System));
    } else {
        method_exchangeImplementations(method_System, method_Custom);
    }

3. 在hook方法中，通過GCD，發(fā)起自身的網(wǎng)絡(luò)請求，等返回結(jié)果后進(jìn)行參數(shù)映射后再return

- (NSURLSessionDataTask *)hook_dataTaskWithRequest:(NSURLRequest *)request uploadProgress:(nullable void (^)(NSProgress *uploadProgress))uploadProgressBlock downloadProgress:(nullable void (^)(NSProgress *downloadProgress))downloadProgressBlock completionHandler:(nullable void (^)(NSURLResponse *response, id _Nullable responseObject, NSError * _Nullable error))completionHandler {
    // 創(chuàng)建一個(gè)信號量
    dispatch_semaphore_t semaphore = dispatch_semaphore_create(0);

    // 異步操作
    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
        // 在這里執(zhí)行您的異步操作，比如網(wǎng)絡(luò)請求
        // 當(dāng)異步操作完成后，調(diào)用 completionHandler 返回結(jié)果
        
        // 假設(shè)您的異步操作是一個(gè)網(wǎng)絡(luò)請求
        NSURLSessionDataTask *dataTask = [NSURLSession.sharedSession dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
            // 處理異步操作的結(jié)果
            // ...
            
            // 調(diào)用 completionHandler 返回結(jié)果
            completionHandler(response, responseObject, error);
            
            // 發(fā)送信號，解除阻塞
            dispatch_semaphore_signal(semaphore);
        }];
        
        [dataTask resume];
    });

    // 阻塞當(dāng)前線程，等待信號
    dispatch_semaphore_wait(semaphore, DISPATCH_TIME_FOREVER);

    // 返回結(jié)果
    return [self hook_dataTaskWithRequest:request uploadProgress:uploadProgressBlock downloadProgress:downloadProgressBlock completionHandler:completionHandler];
}