首页 > 代码库 > NSURLSession 学习笔记
NSURLSession 学习笔记
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 <NSURLSessionDelegate>)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 <NSCopying> ........ /* 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 =http://www.mamicode.com/ ...; NSURLSession *session = [NSURLSession sharedSession]; NSURLSessionUploadTask *uploadTask = [session uploadTaskWithRequest:request fromData:data completionHandler: ^(NSData *data, NSURLResponse *response, NSError *error) { // ... }]; [uploadTask resume];
参考:http://objccn.io/issue-5-4/
声明:以上内容来自用户投稿及互联网公开渠道收集整理发布,本网站不拥有所有权,未作人工编辑处理,也不承担相关法律责任,若内容有误或涉及侵权可进行投诉: 投诉/举报 工作人员会在5个工作日内联系你,一经查实,本站将立刻删除涉嫌侵权内容。