首页 > 其他 > 详细

NSURLSession 学习笔记

时间:2014-05-09 12:35:33      阅读:2727      评论:0      收藏:0      [点我收藏+]

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

    

bubuko.com,布布扣
@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;
bubuko.com,布布扣
bubuko.com,布布扣
/*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;
bubuko.com,布布扣

异步请求操作

bubuko.com,布布扣
@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
bubuko.com,布布扣

二:NSURLSessionTask 任务

  • 包含三大任务 :NSURLSessionTask--(NSURLSessionDataTask,NSURLSessionUploadTask,NSURLSessionDownloadTask)
  • 关系图

    bubuko.com,布布扣

     系统定义的 常用api,如,对 网络任务的暂停,继续

bubuko.com,布布扣
@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
bubuko.com,布布扣

 任务状态:

bubuko.com,布布扣
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);
bubuko.com,布布扣

 三大子类,Data,Upload,Download操作 ,都是抽象类,基本不提供任何操作

bubuko.com,布布扣
@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
bubuko.com,布布扣

 

三:演示代码

1:异步的GET 请求 Data 数据

bubuko.com,布布扣
    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];
bubuko.com,布布扣

2:异步 下载文件

bubuko.com,布布扣
    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];
bubuko.com,布布扣

3: 异步上传文件

bubuko.com,布布扣
 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];
bubuko.com,布布扣

 

参考:http://objccn.io/issue-5-4/

NSURLSession 学习笔记,布布扣,bubuko.com

NSURLSession 学习笔记

原文:http://www.cnblogs.com/cocoajin/p/3708809.html

(0)
(0)
   
举报
评论 一句话评论(0
关于我们 - 联系我们 - 留言反馈 - 联系我们:wmxa8@hotmail.com
© 2014 bubuko.com 版权所有
打开技术之扣,分享程序人生!