AFNetworking的基本使用

网络请求

• AFNetworking的基本用法和NSURLSession的用法基本是相同的
• AFNetworking的基本使用类
• AFHTTPSessionManager的功能

方法	功能
-(NSURLSessionDataTask *)GET:(NSString *)URLString parameters:(id)parameters progress:(void (^)(NSProgress * _Nonnull))downloadProgress success:(void (^)(NSURLSessionDataTask * _Nonnull, id _Nullable))success failure:(void (^)(NSURLSessionDataTask * _Nullable, NSError * _Nonnull))failure	get请求
- (NSURLSessionDataTask *)POST:(NSString *)URLString parameters:(id)parameters constructingBodyWithBlock:(void (^)(id <AFMultipartFormData> formData))block progress:(nullable void (^)(NSProgress * _Nonnull))uploadProgress success:(void (^)(NSURLSessionDataTask *task, id responseObject))success failure:(void (^)(NSURLSessionDataTask *task, NSError *error))failure	post请求
- (NSURLSessionDownloadTask *)downloadTaskWithRequest:(NSURLRequest *)request progress:(void (^)(NSProgress *downloadProgress)) downloadProgressBlock destination:(NSURL * (^)(NSURL *targetPath, NSURLResponse *response))destination completionHandler:(void (^)(NSURLResponse *response, NSURL *filePath, NSError *error))completionHandler	下载大文件
- (void)setReachabilityStatusChangeBlock:(void (^)(AFNetworkReachabilityStatus status))block	监听网络状态

• 注意:如果要想刷新页面这些需要在主线程进行操作的任务,其实就在block中进行就可以,因为AFNetworking已经帮你回到了主线程

get请求

   AFHTTPSessionManager *mgr = [AFHTTPSessionManager manager];
    //添加返回的值的类型
     mgr.responseSerializer = [AFHTTPResponseSerializer serializer];
    [mgr GET:@"http://b.hiphotos.baidu.com/image/w%3D2048/sign=6be5fc5f718da9774e2f812b8469f919/8b13632762d0f703b0faaab00afa513d2697c515.jpg" parameters:nil progress:^(NSProgress * _Nonnull downloadProgress) {
    //如果要显示进度,就要来到这里,由于请求下来的数据是data,用代理方法是一段一段下来的,所以只要下来一段,就会执行这个block,所有用当前进度除以总进度就会展现出下载的进度条
         [self.slider setValue:1.0 * downloadProgress.completedUnitCount / downloadProgress.totalUnitCount animated:YES];
        NSLog(@"进度 = %f",1.0 * downloadProgress.completedUnitCount / downloadProgress.totalUnitCount);
    } success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {
    //成功就会走这里,responseObject是字典或者数组
        NSLog(@"%@",responseObject);
    } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
    //失败就会走到这里
        NSLog(@"err = %@",error);
    }];

post请求

    AFHTTPSessionManager *mgr =[AFHTTPSessionManager manager];
    //这里可以添加评论,把评论放到这里,放入parameters字典中返回给服务器,请求成功后刷新cell就会展现评论
    NSString *content = @"你别吃了,再吃就胖死了";
    NSString *str =[content stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLQueryAllowedCharacterSet]];
    [mgr POST:@"http://api2.pianke.me/comment/add" parameters:@{@"auth":@"XZU7RH7m1861DC8Z8H8HvkTJxQMGoPLGO9zo4XDA0cWP22NdFSh9d7fo",@"client":@1,@"content":str,@"contentid":@"553a073adfa688b70300001c",@"deviceid":@"6D4DD967-5EB2-40E2-A202-37E64F3BEA31",@"recid":@"",@"reuid":@"",@"version":@"3.0.6"}
constructingBodyWithBlock:^(id<AFMultipartFormData>  _Nonnull formData) {
        //上传数据(这里只做上传数据)
    } progress:^(NSProgress * _Nonnull uploadProgress) {
        //进度条
    } success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {
        //成功,responseObject就是返回的数据
        NSLog(@"%@",responseObject);
    } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
        //失败
        NSLog(@"%@",error);
    }];

下载大文件

   AFHTTPSessionManager *mgr =[AFHTTPSessionManager manager];
    //设置请求
    NSURLRequest *req = [NSURLRequest requestWithURL:[NSURL URLWithString: @"网络请求" ]];
    [mgr downloadTaskWithRequest:req progress:^(NSProgress * _Nonnull downloadProgress) {
        //这里是进度条
    } destination:^NSURL * _Nonnull(NSURL * _Nonnull targetPath, NSURLResponse * _Nonnull response) {
        //这里第一个参数你要给一个文件下载的路径
    } completionHandler:^(NSURLResponse * _Nonnull response, NSURL * _Nullable filePath, NSError * _Nullable error) {
        //这里是下载完成给你的响应,文件路径,错误,
    }];

文件上传

    [mgr POST:@"http://api2.pianke.me/comment/add" parameters:nil
constructingBodyWithBlock:^(id<AFMultipartFormData>  _Nonnull formData) {
        //设置上传的文件
    NSData *data = [NSData dataWithContentsOfFile:@"用户上传的本地文件的地址"];
    //这里设置上传文件的请求头,请求体的设置AFMultipartFormData帮你拼接好了,只要调下面的方法就可以了
    [formData appendPartWithFileData:data name:<#(nonnull NSString *)#> fileName:<#(nonnull NSString *)#> mimeType:<#(nonnull NSString *)#>];
    } progress:^(NSProgress * _Nonnull uploadProgress) {
        //进度条
    } success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {
        //上传成功,返回响应
        NSLog(@"%@",responseObject);
    } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
        //失败
        NSLog(@"%@",error);
    }];

监听网络状态

• 一般在AppDelegate里面监听的是整个app的状态,在控制器监听的是当前的页面,
• 如果监听的话可以写个bool型的方法去监听,返回是否有网络

//这里去监听是否有网
+ (BOOL)isNet
{
    return [AFNetworkReachabilityManager manager].reachableViaWiFi ||[AFNetworkReachabilityManager manager].reachableViaWWAN;
}
    //检测网络
    AFNetworkReachabilityManager *magr = [ AFNetworkReachabilityManager sharedManager];
    [magr setReachabilityStatusChangeBlock:^(AFNetworkReachabilityStatus status) {
        switch (status) {
            case AFNetworkReachabilityStatusUnknown:
                NSLog(@"不清楚");
                break;
            case AFNetworkReachabilityStatusNotReachable:
                NSLog(@"连接不上");
                break;
            case AFNetworkReachabilityStatusReachableViaWiFi:
                NSLog(@"WiFi");
                break;
            case AFNetworkReachabilityStatusReachableViaWWAN:
                NSLog(@"蜂窝网");
                break;
        }
    }];
    //开启检测
    [magr startMonitoring];