2016 - 1 - 24 NSURLSession （一）

一: NSURLSession简介

1.实施步骤

1.1 使用 NSURLSession对象 创建TASK ，然后执行TASK

2.TASK的类型:

二: NSURLSession的简单使用:

- (void)download{

    NSURL*url = [NSURL URLWithString:@"http://120.25.226.186:32812/resources/images/minion_15.png"];

//    NSURLRequest *request = [NSURLRequest requestWithURL:url];

    NSURLSession *session = [NSURLSession sharedSession];

    // 创建TASK 下载到location中

    NSURLSessionDownloadTask *tast = [session downloadTaskWithURL:url completionHandler:^(NSURL * _Nullable location, NSURLResponse * _Nullable response, NSError * _Nullable error) {

        NSLog(@"%s",__func__);

        NSFileManager *fileManger = [NSFileManager defaultManager];

        // 设置下载的文件路径和文件名

        NSString *file = [[NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject] stringByAppendingString:response.suggestedFilename];

        [fileManger moveItemAtURL:location toURL:[NSURL fileURLWithPath:file] error:nil];

        NSLog(@"%@",file);

    }];

        [tast resume];

}

三: NSURLSession 的代理

需要注意在接受到响应的代理方法中设置允许处理服务器响应

- (void)delegate{

     NSURL*url = [NSURL URLWithString:@"http://120.25.226.186:32812/resources/images/minion_15.png"];

//     NSURLRequest *request = [NSURLRequest requestWithURL:url];

    //  Configuration 配置外形

    NSURLSession *session = [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration] delegate:self delegateQueue:[[NSOperationQueue alloc] init]];

    NSURLSessionDataTask *task = [session dataTaskWithURL:url];

    [task resume];

}

// 接收到到相应调用的代理方法

- (void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTask didReceiveResponse:(NSURLResponse *)response completionHandler:(void (^)(NSURLSessionResponseDisposition))completionHandler{// Dispositon 处置

    NSLog(@"%s",__func__);

    // 允许处理服务器相应，

    completionHandler(NSURLSessionResponseAllow);

}

- (void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTask didReceiveData:(NSData *)data{

    NSLog(@"%s",__func__);

}

- (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didCompleteWithError:(NSError *)error{

    NSLog(@"'%@",error);

    NSLog(@"%s",__func__);

}