GET请求

/** 请求网络 */
- (void)loadNetwork{
    //发送请求
    [SVProgressHUD showWithStatus:@"加载中"];
    // 请求参数
    NSMutableDictionary *params = [NSMutableDictionary dictionary];
    params[@"a"] = @"1";
    params[@"action"] = @"2";
    params[@"c"] = @"3";
    [[AFHTTPSessionManager manager]GET:@"http://api.xxx.com/api/api_open.php" parameters:params progress:nil success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {
        [SVProgressHUD dismiss];
        //数组转模型
        self.tags = [WYRecommendTagModel mj_objectArrayWithKeyValuesArray:responseObject];
        //不刷新不出现
        [self.tableView reloadData];
    } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
        [SVProgressHUD setMinimumDismissTimeInterval:1];
        [SVProgressHUD showErrorWithStatus:@"加载失败"];
    }];
}

POST请求

/** 请求网络 */
- (void)loadNetwork{
    //发送请求
    [SVProgressHUD showWithStatus:@"加载中"];
    // 请求参数
    NSMutableDictionary *params = [NSMutableDictionary dictionary];
    params[@"a"] = @"1";
    params[@"action"] = @"2";
    params[@"c"] = @"3";
    [[AFHTTPSessionManager manager]POST:@"http://api.xxx.com/api/api_open.php" parameters:params progress:nil success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {
        [SVProgressHUD dismiss];
        //数组转模型
        self.tags = [WYRecommendTagModel mj_objectArrayWithKeyValuesArray:responseObject];
        //不刷新不出现
        [self.tableView reloadData];
    } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
        [SVProgressHUD setMinimumDismissTimeInterval:1];
        [SVProgressHUD showErrorWithStatus:@"加载失败"];
    }];
}

AFN3.0下载方法

/** AFN3.0 下载  */
- (void)downLoad{
    //1.创建管理者对象
    AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
    //2.确定请求的URL地址
    NSURL *url = [NSURL URLWithString:@""];
    //3.创建请求对象
    NSURLRequest *request = [NSURLRequest requestWithURL:url];
    //下载任务
    NSURLSessionDownloadTask *task = [manager downloadTaskWithRequest:request progress:^(NSProgress * _Nonnull downloadProgress) {
        //打印下下载进度
        WKNSLog(@"%lf",1.0 * downloadProgress.completedUnitCount / downloadProgress.totalUnitCount);
    } destination:^NSURL * _Nonnull(NSURL * _Nonnull targetPath, NSURLResponse * _Nonnull response) {
        //下载地址
        WKNSLog(@"默认下载地址:%@",targetPath);
        //设置下载路径，通过沙盒获取缓存地址，最后返回NSURL对象
        NSString *filePath = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES)lastObject];
        return [NSURL URLWithString:filePath];
    } completionHandler:^(NSURLResponse * _Nonnull response, NSURL * _Nullable filePath, NSError * _Nullable error) {
        //下载完成调用的方法
        WKNSLog(@"下载完成：");
        WKNSLog(@"%@--%@",response,filePath);
    }];
    //开始启动任务
    [task resume];
}

AFN3.0 上传

/**
 *  AFN 3.0 上传
 *  有两种方式
 *  upLoad1 和 upLoad2
 */
//第一种方法是通过工程中的文件进行上传
- (void)upLoad1{
    //1。创建管理者对象
    AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
    //2.上传文件
    NSDictionary *dict = @{@"username":@"1234"};
    NSString *urlString = @"22222";
    [manager POST:urlString parameters:dict constructingBodyWithBlock:^(id<AFMultipartFormData>  _Nonnull formData) {
        //上传文件参数
        UIImage *iamge = [UIImage imageNamed:@"123.png"];
        NSData *data = UIImagePNGRepresentation(iamge);
        //这个就是参数
        [formData appendPartWithFileData:data name:@"file" fileName:@"123.png" mimeType:@"image/png"];
    } progress:^(NSProgress * _Nonnull uploadProgress) {
        //打印下上传进度
        WKNSLog(@"%lf",1.0 *uploadProgress.completedUnitCount / uploadProgress.totalUnitCount);
    } success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {
        //请求成功
        WKNSLog(@"请求成功：%@",responseObject);
    } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
        //请求失败
        WKNSLog(@"请求失败：%@",error);
    }];
}

//第二种是通过URL来获取路径，进入沙盒或者系统相册等等
- (void)upLoda2{
    //1.创建管理者对象
    AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
    //2.上传文件
    NSDictionary *dict = @{@"username":@"1234"};
    NSString *urlString = @"22222";
    [manager POST:urlString parameters:dict constructingBodyWithBlock:^(id<AFMultipartFormData>  _Nonnull formData) {
        [formData appendPartWithFileURL:[NSURL fileURLWithPath:@"文件地址"] name:@"file" fileName:@"1234.png" mimeType:@"application/octet-stream" error:nil];
    } progress:^(NSProgress * _Nonnull uploadProgress) {
        //打印下上传进度
        WKNSLog(@"%lf",1.0 *uploadProgress.completedUnitCount / uploadProgress.totalUnitCount);
    } success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {
        //请求成功
        WKNSLog(@"请求成功：%@",responseObject);
    } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
        //请求失败
        WKNSLog(@"请求失败：%@",error);
    }];
}

监测当前网络状态（网络监听）

- (void)AFNetworkStatus{
    //1.创建网络监测者
    AFNetworkReachabilityManager *manager = [AFNetworkReachabilityManager sharedManager];
    /*枚举里面四个状态  分别对应 未知 无网络 数据 WiFi
     typedef NS_ENUM(NSInteger, AFNetworkReachabilityStatus) {
         AFNetworkReachabilityStatusUnknown          = -1,      未知
         AFNetworkReachabilityStatusNotReachable     = 0,       无网络
         AFNetworkReachabilityStatusReachableViaWWAN = 1,       蜂窝数据网络
         AFNetworkReachabilityStatusReachableViaWiFi = 2,       WiFi
     };
     */
    [manager setReachabilityStatusChangeBlock:^(AFNetworkReachabilityStatus status) {
        //这里是监测到网络改变的block  可以写成switch方便
        //在里面可以随便写事件
        switch (status) {
            case AFNetworkReachabilityStatusUnknown:
                WKNSLog(@"未知网络状态");
                break;
            case AFNetworkReachabilityStatusNotReachable:
                WKNSLog(@"无网络");
                break;
            case AFNetworkReachabilityStatusReachableViaWWAN:
                WKNSLog(@"蜂窝数据网");
                break;
            case AFNetworkReachabilityStatusReachableViaWiFi:
                WKNSLog(@"WiFi网络");
                break;
            default:
                break;
        }
    }] ;
}

勤学如早春之苗，不见其增，日有所涨。
辍学如磨刀之石，不见其减，日有所损。