NSURLSession 学习笔记
一：NSURLSession
- 类似之前的NSURLConnection, 可配置每个session的 cookie,证书等网络连接配置信息
NSURLSessionConfiguration
- 包含三大任务 ：NSURLSessionTask--(NSURLSessionDataTask,NSURLSessionUploadTask,NSURLSessionDownloadTask)
- 常用api
@interface NSURLSession : NSObject// 单例+ (NSURLSession *)sharedSession;//配置 Session+ (NSURLSession *)sessionWithConfiguration:(NSURLSessionConfiguration *)configuration;+ (NSURLSession *)sessionWithConfiguration:(NSURLSessionConfiguration *)configuration delegate:(id)delegate delegateQueue:(NSOperationQueue *)queue;
/*Data 请求 request */- (NSURLSessionDataTask *)dataTaskWithRequest:(NSURLRequest *)request;/* Data 请求 url. */- (NSURLSessionDataTask *)dataTaskWithURL:(NSURL *)url;/* 上传文件请求 fileUrl */- (NSURLSessionUploadTask *)uploadTaskWithRequest:(NSURLRequest *)request fromFile:(NSURL *)fileURL;/* 上传Data请求 NSData */- (NSURLSessionUploadTask *)uploadTaskWithRequest:(NSURLRequest *)request fromData:(NSData *)bodyData;/* 上传数据流请求 request */- (NSURLSessionUploadTask *)uploadTaskWithStreamedRequest:(NSURLRequest *)request;/* 下载文件.request */- (NSURLSessionDownloadTask *)downloadTaskWithRequest:(NSURLRequest *)request;/* 下载文件 url */- (NSURLSessionDownloadTask *)downloadTaskWithURL:(NSURL *)url;/* 断点下载请求 ， */- (NSURLSessionDownloadTask *)downloadTaskWithResumeData:(NSData *)resumeData;
异步请求操作
@interface NSURLSession (NSURLSessionAsynchronousConvenience)/* 异步数据请求 NSData */- (NSURLSessionDataTask *)dataTaskWithRequest:(NSURLRequest *)request completionHandler:(void (^)(NSData *data, NSURLResponse *response, NSError *error))completionHandler;- (NSURLSessionDataTask *)dataTaskWithURL:(NSURL *)url completionHandler:(void (^)(NSData *data, NSURLResponse *response, NSError *error))completionHandler;/* * 异步文件上传请求 file,NSData */- (NSURLSessionUploadTask *)uploadTaskWithRequest:(NSURLRequest *)request fromFile:(NSURL *)fileURL completionHandler:(void (^)(NSData *data, NSURLResponse *response, NSError *error))completionHandler;- (NSURLSessionUploadTask *)uploadTaskWithRequest:(NSURLRequest *)request fromData:(NSData *)bodyData completionHandler:(void (^)(NSData *data, NSURLResponse *response, NSError *error))completionHandler;/* 异步下载请求 */- (NSURLSessionDownloadTask *)downloadTaskWithRequest:(NSURLRequest *)request completionHandler:(void (^)(NSURL *location, NSURLResponse *response, NSError *error))completionHandler;- (NSURLSessionDownloadTask *)downloadTaskWithURL:(NSURL *)url completionHandler:(void (^)(NSURL *location, NSURLResponse *response, NSError *error))completionHandler;- (NSURLSessionDownloadTask *)downloadTaskWithResumeData:(NSData *)resumeData completionHandler:(void (^)(NSURL *location, NSURLResponse *response, NSError *error))completionHandler;@end
二：NSURLSessionTask 任务
- 包含三大任务 ：NSURLSessionTask--(NSURLSessionDataTask,NSURLSessionUploadTask,NSURLSessionDownloadTask)
- 关系图
系统定义的 常用api，如，对 网络任务的暂停，继续
@interface NSURLSessionTask : NSObject......../* 取消任务*/- (void)cancel;/* 任务状态*/@property (readonly) NSURLSessionTaskState state;/*任务暂停和继续 */- (void)suspend;- (void)resume; ........@end
任务状态：
typedef NS_ENUM(NSInteger, NSURLSessionTaskState) { NSURLSessionTaskStateRunning = 0, /* The task is currently being serviced by the session */ NSURLSessionTaskStateSuspended = 1, NSURLSessionTaskStateCanceling = 2, /* The task has been told to cancel. The session will receive a URLSession:task:didCompleteWithError: message. */ NSURLSessionTaskStateCompleted = 3, /* The task has completed and the session will receive no more delegate notifications */} NS_ENUM_AVAILABLE(10_9, 7_0); 三大子类，Data,Upload，Download操作 ，都是抽象类，基本不提供任何操作
@interface NSURLSessionDataTask : NSURLSessionTask@end/* * An NSURLSessionUploadTask does not currently provide any additional*/@interface NSURLSessionUploadTask : NSURLSessionDataTask@end@interface NSURLSessionDownloadTask : NSURLSessionTask/*断点续传 */- (void)cancelByProducingResumeData:(void (^)(NSData *resumeData))completionHandler;@end
三：演示代码
1:异步的GET 请求 Data 数据
NSURL *url = [NSURL URLWithString:@"http://httpbin.org/get"]; NSURLSession *session = [NSURLSession sharedSession]; NSURLSessionDataTask *dataTask = [session dataTaskWithURL:url completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) { NSLog(@"%@",[[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding]); }]; //任务创建后，不会立即执行，调用resume 立即执行; [dataTask resume]; 2：异步 下载文件
NSURL *url = [NSURL URLWithString:@"http://dl.360safe.com/360zip_setup_3.1.0.2061.exe"]; NSURLRequest *request = [NSURLRequest requestWithURL:url]; NSURLSession *session = [NSURLSession sharedSession]; NSURLSessionDownloadTask *downTask = [session downloadTaskWithRequest:request completionHandler:^(NSURL *location, NSURLResponse *response, NSError *error) { //文件下载会被先写入到一个 临时路径 location,我们需要将下载的文件移动到我们需要地方保存 NSURL *savePath = [NSURL fileURLWithPath:@"/Users/user/Desktop/360zip.exe"]; [[NSFileManager defaultManager] moveItemAtURL:location toURL:savePath error:nil]; }]; [downTask resume]; 3: 异步上传文件
NSURL *URL = [NSURL URLWithString:@"http://example.com/upload"]; NSURLRequest *request = [NSURLRequest requestWithURL:URL]; NSData *data = ...; NSURLSession *session = [NSURLSession sharedSession]; NSURLSessionUploadTask *uploadTask = [session uploadTaskWithRequest:request fromData:data completionHandler: ^(NSData *data, NSURLResponse *response, NSError *error) { // ... }]; [uploadTask resume];
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