网络总结

多线程

• NSThread
• GCD
  • 队列
    • 并发队列
      • 全局队列
      • 自己创建
    • 串行队列
      • 自己创建
      • 主队列
  • 任务：block
  • 函数
    • sync：同步函数
    • async：异步函数
  • 单例模式
• NSOperation
• RunLoop
  • 同一时间只能选择一个运行模式
  • 常用模式
    • Default：默认
    • Tracking：拖拽UIScrollView

网络

HTTP请求

• GET请求

  
  // 将URL转换成UTF-8
  NSString * urlString = @"你好";
  NSCharacterSet * set = [NSCharacterSet characterSetWithCharactersInString:urlString];
  urlString = [urlString stringByAddingPercentEncodingWithAllowedCharacters:set];
  
  NSURL * url = [NSURL URLWithString:urlString];
  
  // 创建一个GET请求
  NSURLRequest * request = [NSURLRequest requestWithURL:url];
  

• post

    // 将URL转换成UTF-8
    NSString * urlString = @"你好";
    NSCharacterSet * set = [NSCharacterSet characterSetWithCharactersInString:urlString];
    urlString = [urlString stringByAddingPercentEncodingWithAllowedCharacters:set];
  
    NSURL * url = [NSURL URLWithString:urlString];
  
    // 创建一个GET请求
    NSMutableURLRequest * request = [NSMutableURLRequest requestWithURL:url];
    request.HTTPMethod = @"POST";
  

  NSURLConnection(iOS9已经过期)

• 同步方法
• 异步方法（block）
• 异步方法- 代理

  NSURLSession

• 发送一般的GET\POST请求

  // 将URL转换成UTF-8
    NSString * urlString = @"你好";
    NSCharacterSet * set = [NSCharacterSet characterSetWithCharactersInString:urlString];
    urlString = [urlString stringByAddingPercentEncodingWithAllowedCharacters:set];
  
    NSURL * url = [NSURL URLWithString:urlString];
  
    // 创建一个GET请求
    NSMutableURLRequest * request = [NSMutableURLRequest requestWithURL:url];
    request.HTTPMethod = @"POST";
  
    NSURLSessionDataTask * task = [[NSURLSession sharedSession] dataTaskWithRequest:request completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {
  
    }];
    [task resume];
  

• 下载文件- 不需要离线断点

    // 将URL转换成UTF-8
    NSString * urlString = @"你好";
    NSCharacterSet * set = [NSCharacterSet characterSetWithCharactersInString:urlString];
    urlString = [urlString stringByAddingPercentEncodingWithAllowedCharacters:set];
  
    NSURL * url = [NSURL URLWithString:urlString];
  
    // 创建一个GET请求
    NSMutableURLRequest * request = [NSMutableURLRequest requestWithURL:url];
    request.HTTPMethod = @"POST";
  
    NSURLSessionDownloadTask * task = [[NSURLSession sharedSession] downloadTaskWithRequest:request completionHandler:^(NSURL * _Nullable location, NSURLResponse * _Nullable response, NSError * _Nullable error) {
  
    }];
    [task resume];
  

• 下载文件- 需要离线断点

  // 将URL转换成UTF-8
    NSString * urlString = @"你好";
    NSCharacterSet * set = [NSCharacterSet characterSetWithCharactersInString:urlString];
    urlString = [urlString stringByAddingPercentEncodingWithAllowedCharacters:set];

    NSURL * url = [NSURL URLWithString:urlString];

    // 创建一个GET请求
    NSMutableURLRequest * request = [NSMutableURLRequest requestWithURL:url];
    request.HTTPMethod = @"POST";

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

    // 设置请求头（例如告诉服务器从第1024个字节开始下载）
    [request setValue:@"bytes=1024-" forHTTPHeaderField:@"Range"];

    // 创建任务
    NSURLSessionDataTask * task = [session dataTaskWithRequest:request];

    // 开启任务
    [task resume];

#pragma mark - NSURLSessionDataDelegate
- (void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTask didReceiveResponse:(NSURLResponse *)response completionHandler:(void (^)(NSURLSessionResponseDisposition))completionHandler {

    // 打开流

    // 获得文件的总长度

    // 存储文件的总长度

    // 回调

    completionHandler(NSURLSessionResponseAllow);
}

- (void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTask didReceiveData:(NSData *)data {
    // 利用NSOutputStream写入数据

    // 计算下载进度
}

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

    // 关闭并且清空NSOutputStream

    // 清空任务
}

• 文件上传 <可以用POST请求>
  • 设置请求头
  • 拼接请求体
  • 其他参数（非文件参数）

    // 将URL转换成UTF-8
    NSString * urlString = @"你好";
    NSCharacterSet * set = [NSCharacterSet characterSetWithCharactersInString:urlString];
    urlString = [urlString stringByAddingPercentEncodingWithAllowedCharacters:set];

    NSURL * url = [NSURL URLWithString:urlString];

    // 创建一个GET请求
    NSMutableURLRequest * request = [NSMutableURLRequest requestWithURL:url];
    request.HTTPMethod = @"POST";


    NSURLSessionUploadTask * task = [[NSURLSession sharedSession] uploadTaskWithRequest:request fromData:body completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {

    }];

    [task resume];

AFNetWorking

UIWebView