AFNetworking 3.X 简单使用

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一、网络请求：

• GET方式：

    AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
    
    [manager GET:URLString parameters:nil progress:nil success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {
        NSLog(@"responseObject : %@", responseObject);
        
    } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
        NSLog(@"error : %@", error.description);

    }];

• POST方式：

    AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
    
    [manager POST:URLString parameters:params progress:^(NSProgress * _Nonnull uploadProgress) {
        
    } success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {
        NSLog(@"responseObject : %@", responseObject);

    } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
        NSLog(@"error : %@", error);
    }];

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二、文件上传：

• 通过工程中的文件上传

    AFHTTPSessionManager *sessionManager = [AFHTTPSessionManager manager];

    [sessionManager POST:URL parameters:params constructingBodyWithBlock:^(id<AFMultipartFormData>  _Nonnull formData) {
        NSString *filePath = [[NSBundle mainBundle] pathForResource:@"a.jpg" ofType:nil];
        NSData *imgData = [NSData dataWithContentsOfFile:filePath];
        
        [formData appendPartWithFileData:imgData name:@"pic" fileName:@"filename" mimeType:@"image/jpg"];
        
    } progress:^(NSProgress * _Nonnull uploadProgress) {
        // 获取上传的进度
        NSLog(@"%.2f",uploadProgress.fractionCompleted);
        NSLog(@"线程：%@",[NSThread currentThread]); // 子线程
        
    } success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {
        // 请求成功
        NSLog(@"请求成功：%@",responseObject);
        NSLog(@"线程：%@",[NSThread currentThread]); // 主线程
        
    } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
        // 请求失败
        NSLog(@"请求失败：%@",error);
    }];

• 根据URL路径上传

    AFHTTPSessionManager *sessionManager = [AFHTTPSessionManager manager];

    [sessionManager POST:@" " parameters:@{@" " : @" "} constructingBodyWithBlock:^(id<AFMultipartFormData> formData) {
        // 在block中设置需要上传的文件
        [formData appendPartWithFileURL:[NSURL fileURLWithPath:@"文件路径"] name:@"file" error:nil];
        
    } success:^(NSURLSessionDataTask *task, id responseObject) {
        NSLog(@"成功：%@", responseObject);
        
    } failure:^(NSURLSessionDataTask *task, NSError *error) {
        NSLog(@"失败：%@", error);
    }];

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三、文件下载

• 使用 NSURLSessionDownloadTask 类

    AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
    
    NSURL *url = [NSURL URLWithString:@" "];
    NSURLRequest *request = [NSURLRequest requestWithURL:url];
    
    // 下载文件
    NSURLSessionDownloadTask *task = [manager downloadTaskWithRequest:request progress:^(NSProgress * _Nonnull downloadProgress) {
        // block会实时调用
        NSLog(@"%.2f",downloadProgress.fractionCompleted);
        
    } destination:^NSURL * _Nonnull(NSURL * _Nonnull targetPath, NSURLResponse * _Nonnull response) {
        // NSHomeDirectory()可以得到应用程序目录的路径
        // 返回一个URL存储文件
        NSString *filePath = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents/***.mp3"];
        NSURL *url = [NSURL fileURLWithPath:filePath];
        
        return url;

    } completionHandler:^(NSURLResponse * _Nonnull response, NSURL * _Nullable filePath, NSError * _Nullable error) {
        if (error) {
            NSLog(@"下载失败 ~~~ %@",error);
        }else {
            NSLog(@"下载成功");
        }
    }];
    
    // 开始下载任务
    [task resume];

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四、网络监听

• 使用 AFNetworkReachabilityManager 类

    // 获得网络监控的管理者
    AFNetworkReachabilityManager *manager = [AFNetworkReachabilityManager manager];
    
    // 只要网络环境发生变化，就会调用此 block
    [manager setReachabilityStatusChangeBlock:^(AFNetworkReachabilityStatus status) {
        
        /* 枚举里面的四个状态
         AFNetworkReachabilityStatusUnknown          = -1,  未知
         AFNetworkReachabilityStatusNotReachable     =  0,   不可用
         AFNetworkReachabilityStatusReachableViaWWAN =  1,   手机自带网络
         AFNetworkReachabilityStatusReachableViaWiFi =  2,   wifi
         */
        switch (status) {
            case AFNetworkReachabilityStatusUnknown:
                NSLog(@"未知");
                break;
            case AFNetworkReachabilityStatusNotReachable:
                NSLog(@"不可用");
                break;
            case AFNetworkReachabilityStatusReachableViaWWAN:
                NSLog(@"手机自带网络");
                break;
            case AFNetworkReachabilityStatusReachableViaWiFi:
                NSLog(@"Wifi");
                break;
            default:
                break;
        }   
    }];
    
    // 开始监听
    [manager startMonitoring];

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