NSURLSession
- 使用步骤
- 创建NSURLSession
- 创建Task
- 执行Task
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- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { [self post]; } //get第一种 - (void)get { NSLog(@"%s", __func__); NSURL *url = [NSURL URLWithString:@"http://xxxxxxxx/login?username=xxxxxxxx&pwd=xxxxxxxx&type=JSON"]; NSURLRequest *request = [NSURLRequest requestWithURL:url]; // 1.创建NSURLSession NSURLSession *session = [NSURLSession sharedSession]; // 2.利用NSURLSession创建Task NSURLSessionDataTask *task = [session dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) { /* data: 服务器返回给我们的数据 response : 响应头 error: 错误信息 */ NSLog(@"%@", [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]); }]; // 3.执行Task [task resume]; } //get第二种 - (void)get2 { NSURL *url = [NSURL URLWithString:@"http://xxxxxxxx/login?username=xxxxxxxx&pwd=xxxxxxxx&type=JSON"]; // 1.创建NSURLSession NSURLSession *session = [NSURLSession sharedSession]; // 2.利用NSURLSession创建Task // 如果是通过传入url的方法创建Task, 方法内部会自动根据URL创建一个Request // 如果是发送Get请求, 或者不需要设置请求头信息, 那么建议使用当前方法发送请求 NSURLSessionDataTask *task = [session dataTaskWithURL:url completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) { NSLog(@"%@", [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]); }]; // 3.执行Task [task resume]; } //第三种使用方式 post - (void)post { NSURL *url = [NSURL URLWithString:@"xxxxxxxx/login"]; NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url]; request.HTTPMethod = @"POST"; request.HTTPBody = [@"username=xxxxxxxx&pwd=xxxxxxxx&type=JSON" dataUsingEncoding:NSUTF8StringEncoding]; // 1.创建NSURLSession NSURLSession *session = [NSURLSession sharedSession]; // 2.利用NSURLSession创建Task NSURLSessionDataTask *task = [session dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) { NSLog(@"%@", [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]); }]; // 3.执行Task [task resume]; }
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NSURLSessionDataTask
- GET
-
NSURL *url = [NSURL URLWithString:@"http://xxxxxxxx/login?username= xxxxxxxx&pwd= xxxxxxxx"]; 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://xxxxxxxx/login?username= xxxxxxxx&pwd= xxxxxxxx"]; // 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://xxxxxxxx/login"]; // 设置请求头 NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url]; request.HTTPMethod = @"POST"; request.HTTPBody = [@"username= xxxxxxxx&pwd= xxxxxxxx" 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
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// 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
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// 1.创建request NSURL *url = [NSURL URLWithString:@"http://xxxxxxxx/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
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//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
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NSMutableURLRequest *reuqest = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"http://xxxxxxxx/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;
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-
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
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[self.session uploadTaskWithRequest:<#(nonnull NSURLRequest *)#> fromFile:<#(nonnull NSURL *)#>]
- 监听上传进度
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/* 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__); }
- 设置设置请求头, 告诉服务器是文件上传