NSURLSession下載和斷點(diǎn)續(xù)傳(煙臺(tái)杰瑞教育IOS培訓(xùn)部原創(chuàng))

1、NSURLSession下載和斷點(diǎn)續(xù)傳NSURLSession是iOS7以后新的網(wǎng)絡(luò)接口，和常經(jīng)常使用到NSURLConnection是類似的。在程序在前臺(tái)時(shí)，NSURLSession與NSURLConnection能夠彼此的替代?？墒钱?dāng)用戶在對(duì)程序進(jìn)行強(qiáng)制關(guān)閉的時(shí)候現(xiàn)在NSURLSession會(huì)默許的自動(dòng)斷開。相較而言NSURLSession的優(yōu)勢(shì)要緊體此刻后臺(tái)操作時(shí)候，而且在最流行的框架AFNetworking中也對(duì)NSURLSession提供了更好的支持。要緊提供的功能如下：1下載文件到內(nèi)存中2下載文件到途徑3上傳制定的文件等案例演示：圖片下載斷點(diǎn)續(xù)傳豆Ieu底皿.PhMQi屯.Iphx

2、口片/©91，5W號(hào)卜要緊代碼：一、概念幾個(gè)全局變量©interfaceViewController()NSURLSessionDownloadTask*_task;NSData*_data;NSURLSession*_session;NSURLRequest*_request;UlProgressView*_pro;UllmageView*_imageView;二、向視圖中添加圖片進(jìn)度條_imageView=UIImageViewallocinitWithFrame:CGRectMake(0,0,300,300);_imageView.center=self.view.c

3、enter;self.viewaddSubview:_imageView;_pro=UIProgressViewallocinitWithFrame:CGRectMake(_imageView.frame.origin.x,_imageView.frame.origin.y+400,300,40);3、向視圖中添加按鈕(一樣的方式添加三個(gè))UIButton*button=UIButtonallocinitWithFrame:CGRectMake(50,_imageView.frame.origin.y+400+20,50,40);button.backgroundColor=UIColorbl

4、ueColor;buttonsetTitle:聽始"forState:UIControlStateNormal;buttonaddTarget:selfaction:selector(ddLoad)forControlEvents:UIControlEventTouchUpInside;button.layer.borderWidth=1;button.layer.borderColor=UIColorblueColor.CGColor;button.layer.cornerRadius=5;self.viewaddSubview:button;4、通過(guò)AFNetworkReacha

5、bilityManager網(wǎng)絡(luò)狀態(tài)監(jiān)測(cè)- (void)_checkNet/開啟網(wǎng)絡(luò)狀態(tài)監(jiān)控AFNetworkReachabilityManagersharedManagerstartMonitoring;AFNetworkReachabilityManagersharedManagersetReachabilityStatusChangeBlockd(AFNetworkReachabilityStatusstatus)if(status=AFNetworkReachabilityStatusReachableViaWiFi)NSLog(當(dāng)前是wifi");if(status=AFNe

6、tworkReachabilityStatusReachableViaWWAN)NSLog('當(dāng)前是3G");if(status=AFNetworkReachabilityStatusNotReachable)NSLog('當(dāng)前是沒(méi)有網(wǎng)絡(luò)”)；if(status=AFNetworkReachabilityStatusUnknown)NSLog('當(dāng)前是未知網(wǎng)絡(luò)")；五、開始下載- (void)ddLoadNSURLSessionConfiguration*config=NSURLSessionConfigurationdefaultSessionCo

7、nfiguration;_session=NSURLSessionsessionWithConfiguration:configdelegate:selfdelegateQueue:nil;/NSURL*url=NSURLURLWithString:src;_request=NSURLRequestrequestWithURL:url;NSLog(開始加載”)；_taskresume;六、設(shè)置暫停和答復(fù)- (void)pause/暫停NSLog(暫停下載")；_taskcancelByProducingResumeDatai(NSData*resumeData)_data=resum

8、eData;；_task=nil;- (void)resume/恢復(fù)NSLog(恢復(fù)下載”)；if(!_data)NSURL*url=NSURLURLWithString:src;_request=NSURLRequestrequestWithURL:url；_task=_sessiondownloadTaskWithRequest:_request;else_task=_sessiondownloadTaskWithResumeData:_data;_taskresume;7、代理方式保留下載文件監(jiān)控下載進(jìn)度#pragmamark-delegate-(void)URLSession:(NSU

9、RLSession*)sessiondownloadTask:(NSURLSessionDownloadTask*)downloadTaskdidFinishDownloadingToURL:(NSURL*)locationNSURL*url=NSURLfileURLWithPath:"/Users/jredu/Desktop/tt.png"NSFileManager*manager=NSFileManagerdefaultManager;managermoveItemAtURL:locationtoURL:urlerronnil;dispatch_async(dispat

10、ch_get_main_queue(),ANSData*data=managercontentsAtPath:"/Users/jredu/Desktop/tt.png"Ullmage*image=UIImageallocinitWithData:data;_imageView.image=image;UIAlertView*alert=UIAlertViewallocinitWithTitle:nilmessage:'下載完成"delegate:selfcancelButtonTitle:"OK"otherButtonTitles:nil;alertshow;);-(void)URLSession:(NSURLSession*)sessiondownloadTask:(NSURLSessionDownloadTask*)downloadTaskdidWriteData:(int64_t)bytesWrittentotalBytesWritten:(int64_t)totalBytesWrittentotalBytesExpectedToWr