iPhone Web 服务通过证书身份验证调用 WCF 服务

，并添加案例代码，内容如下：

// 创建 NSURLSessionConfiguration 对象
NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration defaultSessionConfiguration];
// 设置请求头信息
[configuration setHTTPAdditionalHeaders:@{@"Content-Type" : @"application/json"}];
// 创建 NSURLSession 对象
NSURLSession *session = [NSURLSession sessionWithConfiguration:configuration];

// 创建证书验证策略
NSURLSessionDelegate *delegate = [[NSURLSessionDelegate alloc] init];
// 实现证书验证的逻辑
- (void)URLSession:(NSURLSession *)session didReceiveChallenge:(NSURLAuthenticationChallenge *)challenge completionHandler:(void (^)(NSURLSessionAuthChallengeDisposition, NSURLCredential * _Nullable))completionHandler {
    if ([challenge.protectionSpace.authenticationMethod isEqualToString:NSURLAuthenticationMethodServerTrust]) {
        // 获取服务器返回的证书
        SecTrustRef serverTrust = challenge.protectionSpace.serverTrust;
        
        // 验证证书
        if ([self validateServerTrust:serverTrust]) {
            // 创建 NSURLCredential 对象
            NSURLCredential *credential = [NSURLCredential credentialForTrust:serverTrust];
            
            // 使用证书继续请求
            completionHandler(NSURLSessionAuthChallengeUseCredential, credential);
            return;
        }
    }
    
    // 取消请求
    completionHandler(NSURLSessionAuthChallengeCancelAuthenticationChallenge, nil);
}
// 验证证书
- (BOOL)validateServerTrust:(SecTrustRef)serverTrust {
    // 验证逻辑
    return YES;
}

// 创建 NSURLRequest 对象
NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:@"https://example.com/api/service"]];
// 发起网络请求
NSURLSessionDataTask *dataTask = [session dataTaskWithRequest:request completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {
    if (error) {
        // 处理错误
    } else {
        // 处理数据
    }
}];
// 启动任务
[dataTask resume];