问题
要对第三方厂商SDK的.a静态库中某些网络请求进行替换操作
解决方案
因为第三方厂商SDK中的网络请求框架不对外开放，所以通过对.a库使用Hopper Disassembler进行分析，定位到是使用什么函数进行请求
建立一个方法，对.a中的网络框架方法进行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);
}
- 在hook方法中，通过GCD，发起自身的网络请求，等返回结果后进行参数映射后再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 {
// 创建一个信号量
dispatch_semaphore_t semaphore = dispatch_semaphore_create(0);
// 异步操作
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
// 在这里执行您的异步操作，比如网络请求
// 当异步操作完成后，调用 completionHandler 返回结果
// 假设您的异步操作是一个网络请求
NSURLSessionDataTask *dataTask = [NSURLSession.sharedSession dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
// 处理异步操作的结果
// ...
// 调用 completionHandler 返回结果
completionHandler(response, responseObject, error);
// 发送信号，解除阻塞
dispatch_semaphore_signal(semaphore);
}];
[dataTask resume];
});
// 阻塞当前线程，等待信号
dispatch_semaphore_wait(semaphore, DISPATCH_TIME_FOREVER);
// 返回结果
return [self hook_dataTaskWithRequest:request uploadProgress:uploadProgressBlock downloadProgress:downloadProgressBlock completionHandler:completionHandler];
}
