网络部分(三)

NSURLConnection和RunLoop

  • 默认情况会将NSURLConnection添加当前线程到RunLoop,如果是在子线程中调用NSURLConnection可能会有问题, 因为子线程默认没有RunLoop

  • 如何让代理方法在子线程中执行?

    • [conn setDelegateQueue:[[NSOperationQueue alloc] init]];
  • 注意:

    • NSURLConnection是异步请求
        // 1.发送请求
        NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://120.25.226.186:32812/resources/images/minion_01.png"]] ;
       NSRunLoop *runloop = [NSRunLoop currentRunloop];
       NSURLConnection *conn = [NSURLConnection connectionWithRequest:request delegate:self];
        [conn setDelegateQueue:[[NSOperationQueue alloc] init]];
        // 2.启动runLoop
        // 默认情况下子线程没有RunLoop, 所以需要启动
        [runloop run];

        // 3.如果手动发送请求, 系统内部会自动帮子线程创建一个RunLoop
    //    NSURLConnection *conn = [[NSURLConnection alloc] initWithRequest:request delegate:self startImmediately:YES];
    //    [conn start];

NSURLSession

  • 使用步骤
    • 创建NSURLSession
    • 创建Task
    • 执行Task

NSURLSessionDataTask

  • GET
    NSURL *url = [NSURL URLWithString:@"http://120.25.226.186:32812/login?username=520it&pwd=520it"];
    NSURLRequest *request = [NSURLRequest requestWithURL:url];

    // 1.获得NSURLSession对象
    NSURLSession *session = [NSURLSession sharedSession];

    // 2.创建任务
    NSURLSessionDataTask *task = [session dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
        NSLog(@"%@", [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]);
    }];

    // 3.启动任务
    [task resume];
    NSURL *url = [NSURL URLWithString:@"http://120.25.226.186:32812/login?username=520it&pwd=520it"];
    // 1.获得NSURLSession对象
    NSURLSession *session = [NSURLSession sharedSession];

    // 2.创建任务
    NSURLSessionDataTask *task = [session dataTaskWithURL:url completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
         NSLog(@"%@", [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]);
    }];
    // 3.启动任务
    [task resume];
  • POST
    NSURL *url = [NSURL URLWithString:@"http://120.25.226.186:32812/login"];
    // 设置请求头
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
    request.HTTPMethod = @"POST";
    request.HTTPBody = [@"username=520it&pwd=520it" dataUsingEncoding:NSUTF8StringEncoding];

    // 1.获得NSURLSession对象
    NSURLSession *session = [NSURLSession sharedSession];

    // 2.创建任务
    NSURLSessionDataTask *task = [session dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
        NSLog(@"%@", [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]);
    }];
    // 3.启动任务
    [task resume];
  • NSURLSessionDataDelegate代理注意事项
    • Task都是通过Session监听
 // 1.获得NSURLSession对象
    NSURLSession *session = [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration] delegate:self delegateQueue:[[NSOperationQueue alloc] init]];
+ NSURLSessionDataDelegate`默认不会接受数据`
/**
 * 1.接收到服务器的响应
 */
- (void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTask didReceiveResponse:(NSURLResponse *)response completionHandler:(void (^)(NSURLSessionResponseDisposition))completionHandler
{
    NSLog(@"%s", __func__);
    NSLog(@"%@", [NSThread currentThread]);
    /*
     NSURLSessionResponseAllow: 去向处理服务器响应, 内部会调用[task cancle]
     NSURLSessionResponseCancel: 允许处理服务器的响应,才会继续接收服务器返回的数据
     NSURLSessionResponseBecomeDownload: 讲解当前请求变为下载
     */
    completionHandler(NSURLSessionResponseAllow);
}
/**
 * 2.接收到服务器的数据(可能会被调用多次)
 */
- (void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTask didReceiveData:(NSData *)data
{
    NSLog(@"%s", __func__);
}
/**
 * 3.请求成功或者失败(如果失败,error有值)
 */
- (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didCompleteWithError:(NSError *)error
{
    NSLog(@"%s", __func__);
}

NSURLSessionDownloadTask

  • DownloadTask默认已经实现边下载边写入
    // 1.创建request
    NSURL *url = [NSURL URLWithString:@"http://120.25.226.186:32812/resources/videos/minion_01.mp4"];
    NSURLRequest *request = [NSURLRequest requestWithURL:url];

    // 2.创建session
    NSURLSession *session = [NSURLSession sharedSession];

    // 3.创建下载任务
    NSURLSessionDownloadTask *task = [session downloadTaskWithRequest:request completionHandler:^(NSURL *location, NSURLResponse *response, NSError *error) {
        NSLog(@"%@", location.absoluteString);

        NSFileManager *manager = [NSFileManager defaultManager];
        NSString *toPath = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject];
        toPath = [toPath stringByAppendingPathComponent:response.suggestedFilename];
        // 将下载好的文件从location移动到cache
        [manager moveItemAtURL:location toURL:[NSURL fileURLWithPath:toPath] error:nil];
    }];

    // 4.开启下载任务
    [task resume];
  • DownloadTask断点下载
    • 暂停: suspend
    • 继续: resume
    • 取消: cancel
      • 任务一旦被取消就无法恢复
    • 区别并返回下载信息
    //取消并获取当前下载信息
[self.task cancelByProducingResumeData:^(NSData *resumeData) {
        self.resumeData = resumeData;
    }];

    // 根据用户上次的下载信息重新创建任务
    self.task = [self.session downloadTaskWithResumeData:self.resumeData];
    [self.task resume];
  • DownloadTask监听下载进度
/**
 * 每当写入数据到临时文件时,就会调用一次这个方法
 * totalBytesExpectedToWrite:总大小
 * totalBytesWritten: 已经写入的大小
 * bytesWritten: 这次写入多少
 */
- (void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTask *)downloadTask didWriteData:(int64_t)bytesWritten totalBytesWritten:(int64_t)totalBytesWritten totalBytesExpectedToWrite:(int64_t)totalBytesExpectedToWrite
{
    NSLog(@"正在下载: %.2f", 1.0 * totalBytesWritten / totalBytesExpectedToWrite);
}

/*
 * 根据resumeData恢复任务时调用
 * expectedTotalBytes:总大小
 * fileOffset: 已经写入的大小
 */
- (void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTask *)downloadTask didResumeAtOffset:(int64_t)fileOffset expectedTotalBytes:(int64_t)expectedTotalBytes
{
    NSLog(@"didResumeAtOffset fileOffset = %lld , expectedTotalBytes = %lld", fileOffset, expectedTotalBytes);
}
/**
 * 下载完毕就会调用一次这个方法
 */
- (void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTask *)downloadTask didFinishDownloadingToURL:(NSURL *)location
{
    NSLog(@"下载完毕");
    // 文件将来存放的真实路径
    NSString *file = [[NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject] stringByAppendingPathComponent:downloadTask.response.suggestedFilename];

    // 剪切location的临时文件到真实路径
    NSFileManager *mgr = [NSFileManager defaultManager];
    [mgr moveItemAtURL:location toURL:[NSURL fileURLWithPath:file] error:nil];
}
/**
 * 任务完成
 */
- (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didCompleteWithError:(NSError *)error
{
    NSLog(@"didCompleteWithError");
}

离线断点下载

  • 使用NSURLSessionDataTask
NSMutableURLRequest *reuqest = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"http://120.25.226.186:32812/resources/videos/minion_01.mp4"]];
// 核心方法, 实现从指定位置开始下载
NSInteger currentBytes = KCurrentBytes;
NSString *range = [NSString stringWithFormat:@"bytes=%zd-", currentBytes];
[reuqest setValue:range forHTTPHeaderField:@"Range"];

// 核心方法, 自己实现边下载边写入
- (void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTask didReceiveData:(NSData *)data;

NSURLSessionUploadTask

  • 设置设置请求头, 告诉服务器是文件上传
    • multipart/form-data; boundary=lnj
  • 必须自己严格按照格式拼接请求体
  • 请求体不能设置给request, 只能设置给fromData
    • The body stream and body data in this request object are ignored.
      +
[[self.session uploadTaskWithRequest:request fromData:body completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
        NSLog(@"%@", [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:nil]);
    }] resume];
  • 注意:以下方法用于PUT请求
[self.session uploadTaskWithRequest:<#(nonnull NSURLRequest *)#> fromFile:<#(nonnull NSURL *)#>]
  • 监听上传进度
/*
 bytesSent: 当前发送的文件大小
 totalBytesSent: 已经发送的文件总大小
 totalBytesExpectedToSend: 需要发送的文件大小
 */
- (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didSendBodyData:(int64_t)bytesSent totalBytesSent:(int64_t)totalBytesSent totalBytesExpectedToSend:(int64_t)totalBytesExpectedToSend
{
    NSLog(@"%zd, %zd, %zd", bytesSent, totalBytesSent, totalBytesExpectedToSend);
}

- (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didCompleteWithError:(NSError *)error
{
    NSLog(@"%s", __func__);
}

AFN

  • NSURLConnection包装方法

    • GET

      // 1.创建AFN管理者
      // AFHTTPRequestOperationManager内部包装了NSURLConnection
      AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
      
      // 2.利用AFN管理者发送请求
      NSDictionary *params = @{
                               @"username" : @"520it",
                               @"pwd" : @"520it"
                               };
      [manager GET:@"http://120.25.226.186:32812/login" parameters:params success:^(AFHTTPRequestOperation *operation, id responseObject) {
           NSLog(@"请求成功---%@", responseObject);
      } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
           NSLog(@"请求失败---%@", error);
      }];
    • POST

      // 1.创建AFN管理者
      // AFHTTPRequestOperationManager内部包装了NSURLConnection
      AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
      
      // 2.利用AFN管理者发送请求
      NSDictionary *params = @{
                               @"username" : @"520it",
                               @"pwd" : @"520it"
                               };
      [manager POST:@"http://120.25.226.186:32812/login" parameters:params success:^(AFHTTPRequestOperation *operation, id responseObject) {
          NSLog(@"请求成功---%@", responseObject);
      } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
          NSLog(@"请求失败---%@", error);
      }];
  • NSURLSession包装方法

    • GET

      // 1.创建AFN管理者
      AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
      
      // 2.利用AFN管理者发送请求
      NSDictionary *params = @{
                               @"username" : @"520it",
                               @"pwd" : @"520it"
                               };
      
      [manager GET:@"http://120.25.226.186:32812/login" parameters:params success:^(NSURLSessionDataTask *task, id responseObject) {
           NSLog(@"请求成功---%@", responseObject);
      } failure:^(NSURLSessionDataTask *task, NSError *error) {
          NSLog(@"请求失败---%@", error);
      }];
    • POST

      // 1.创建AFN管理者
      AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
      
      // 2.利用AFN管理者发送请求
      NSDictionary *params = @{
                               @"username" : @"520it",
                               @"pwd" : @"520it"
                               };
      
      [manager POST:@"http://120.25.226.186:32812/login" parameters:params success:^(NSURLSessionDataTask *task, id responseObject) {
          NSLog(@"请求成功---%@", responseObject);
      } failure:^(NSURLSessionDataTask *task, NSError *error) {
          NSLog(@"请求失败---%@", error);
      }];
  • 文件下载

    // 1.创建AFN管理者
    AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];

    // 2.利用AFN管理者发送请求
     NSURLRequest *reuqest = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://120.25.226.186:32812/resources/videos/minion_02.mp4"]];

    [[manager downloadTaskWithRequest:reuqest progress:nil  destination:^NSURL *(NSURL *targetPath, NSURLResponse *response) {
        // targetPath: 已经下载好的文件路径
        NSLog(@"targetPath = %@", targetPath);
        NSString *path = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) firstObject];
        NSURL *documentsDirectoryPath = [NSURL fileURLWithPath:[path stringByAppendingPathComponent:response.suggestedFilename]];
        // 返回需要保存文件的目标路径
        return documentsDirectoryPath;
    } completionHandler:^(NSURLResponse *response, NSURL *filePath, NSError *error) {
        NSLog(@"filePath = %@", filePath);
    }] resume];
  • 监听进度
/*
     要跟踪进度,需要使用 NSProgress,是在 iOS 7.0 推出的,专门用来跟踪进度的类!

     NSProgress只是一个对象!如何跟踪进度!-> KVO 对属性变化的监听!
     @property int64_t totalUnitCount;        总单位数
     @property int64_t completedUnitCount;    完成单位数
     */
    NSProgress *progress = nil;
    // 注册通知
    [progress addObserver:self forKeyPath:@"completedUnitCount" options:NSKeyValueObservingOptionNew context:nil];
    - (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {
    NSLog(@"%@", object);
    /**
     准确的获得进度
     localizedDescription               10%
     localizedAdditionalDescription     completed 32,768 of 318,829
     fractionCompleted                  0.102776(completedUnitCount/totalUnitCount)
     */
    if ([object isKindOfClass:[NSProgress class]]) {
        NSProgress *p = (NSProgress *)object;
        NSLog(@"%@, %@, %f", p.localizedDescription, p.localizedAdditionalDescription, p.fractionCompleted);
  • 文件上传
// 1.创建AFN管理者
    AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];

    // 2.利用AFN管理者发送请求
    [manager POST:@"http://120.25.226.186:32812/upload" parameters:@{@"username" : @"lnj"} constructingBodyWithBlock:^(id<AFMultipartFormData> formData) {
        NSData *data = [NSData dataWithContentsOfFile:@"/Users/NJ-Lee/Desktop/Snip20150811_1.png"];
        [formData appendPartWithFileData:data name:@"file" fileName:@"lnj.png" mimeType:@"image/png"];
    } success:^(NSURLSessionDataTask *task, id responseObject) {
          NSLog(@"请求成功---%@", responseObject);
    } failure:^(NSURLSessionDataTask *task, NSError *error) {
        NSLog(@"请求失败---%@", error);
    }];
[formData appendPartWithFileURL:[NSURL fileURLWithPath:@"/Users/NJ-Lee/Desktop/Snip20150811_1.png"] name:@"file" fileName:@"lnj.png" mimeType:@"image/png" error:nil];
[formData appendPartWithFileURL:[NSURL fileURLWithPath:@"/Users/NJ-Lee/Desktop/Snip20150811_1.png"] name:@"file" error:nil];
  • AFN解耦

    • 自定义单利类基础Manager
    • 优点: 替换框架只需要求改单利类即可
  • 序列化

    • AFN默认将服务器返回的数据当做JSON处理, 会自动解析
      • manager.responseSerializer = [AFJSONRequestSerializer serializer];
    • 告诉AFN,以XML形式解析服务器返回的数据
      • manager.responseSerializer = [AFXMLParserResponseSerializer serializer];
    • 告诉AFN, 不处理服务器返回的数据, 原样返回
      • manager.responseSerializer = [AFHTTPResponseSerializer serializer];
  • 网络状态检测

  • AFN
    // 1.创建网络监听对象
    AFNetworkReachabilityManager *manager = [AFNetworkReachabilityManager sharedManager];
    // 2.设置网络状态改变回调
    [manager setReachabilityStatusChangeBlock:^(AFNetworkReachabilityStatus status) {
        /*
         AFNetworkReachabilityStatusUnknown          = -1,  // 未知
         AFNetworkReachabilityStatusNotReachable     = 0,   // 无连接
         AFNetworkReachabilityStatusReachableViaWWAN = 1,   // 3G 花钱
         AFNetworkReachabilityStatusReachableViaWiFi = 2,   // 局域网络,不花钱
         */
        switch (status) {
            case 0:
                NSLog(@"无连接");
                break;
            case 1:
                NSLog(@"3G 花钱");
                break;
            case 2:
                NSLog(@"局域网络,不花钱");
                break;
            default:
                NSLog(@"未知");
                break;
        }
    }];

    // 3.开始监听
    [manager startMonitoring];
  • 苹果自带

“`objc
- (void)viewDidLoad {
[super viewDidLoad];

// 注册通知
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(getNetworkStatus) name:kReachabilityChangedNotification object:nil];

// 开始监听网络
self.reachability = [Reachability reachabilityForInternetConnection];
[self.reachability startNotifier];

}

  • (void)dealloc
    {
    [[NSNotificationCenter defaultCenter] removeObserver:self];
    [self.reachability stopNotifier];
    }
  • (void)getNetworkStatus{
    if ([Reachability reachabilityForLocalWiFi].currentReachabilityStatus != NotReachable) {
    NSLog(@”wifi”);
    }else if ([Reachability reachabilityForInternetConnection].currentReachabilityStatus != NotReachable)
    {
    NSLog(@”手机自带网络”);
    }else
    {
    NSLog(@”没有网络”);
    }
    }
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