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小編給大家分享一下iOS中NSURLSessionDownloadTask如何設(shè)置代理實(shí)現(xiàn)文件下載,希望大家閱讀完這篇文章之后都有所收獲,下面讓我們一起去探討吧!
通過(guò)代理來(lái)實(shí)現(xiàn)文件下載的問(wèn)題:
#import "ViewController.h" @interface ViewController ()<NSURLSessionDownloadDelegate> @end @implementation ViewController -(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event { [self delegate]; } -(void)delegate { //1.url NSURL *url = [NSURL URLWithString:@"http://120.25.226.186:32812/resources/images/minion_03.png"]; //2.創(chuàng)建請(qǐng)求對(duì)象 NSURLRequest *request = [NSURLRequest requestWithURL:url]; //3.創(chuàng)建session :注意代理為NSURLSessionDownloadDelegate NSURLSession *session = [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration] delegate:self delegateQueue:[NSOperationQueue mainQueue]]; //4.創(chuàng)建Task NSURLSessionDownloadTask *downloadTask = [session downloadTaskWithRequest:request]; //5.執(zhí)行Task [downloadTask resume]; } #pragma mark ---------------------- #pragma mark NSURLSessionDownloadDelegate /** * 寫(xiě)數(shù)據(jù) * * @param session 會(huì)話對(duì)象 * @param downloadTask 下載任務(wù) * @param bytesWritten 本次寫(xiě)入的數(shù)據(jù)大小 * @param totalBytesWritten 下載的數(shù)據(jù)總大小 * @param totalBytesExpectedToWrite 文件的總大小 */ -(void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTask *)downloadTask didWriteData:(int64_t)bytesWritten totalBytesWritten:(int64_t)totalBytesWritten totalBytesExpectedToWrite:(int64_t)totalBytesExpectedToWrite { //1. 獲得文件的下載進(jìn)度 NSLog(@"%f",1.0 * totalBytesWritten/totalBytesExpectedToWrite); } /** * 當(dāng)恢復(fù)下載的時(shí)候調(diào)用該方法 * * @param fileOffset 從什么地方下載 * @param expectedTotalBytes 文件的總大小 */ -(void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTask *)downloadTask didResumeAtOffset:(int64_t)fileOffset expectedTotalBytes:(int64_t)expectedTotalBytes { NSLog(@"%s",__func__); } /** * 當(dāng)下載完成的時(shí)候調(diào)用 * * @param location 文件的臨時(shí)存儲(chǔ)路徑 */ -(void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTask *)downloadTask didFinishDownloadingToURL:(NSURL *)location { NSLog(@"%@",location); //1 拼接文件全路徑 NSString *fullPath = [[NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject] stringByAppendingPathComponent:downloadTask.response.suggestedFilename]; //2 剪切文件 [[NSFileManager defaultManager]moveItemAtURL:location toURL:[NSURL fileURLWithPath:fullPath] error:nil]; NSLog(@"%@",fullPath); } /** * 請(qǐng)求結(jié)束 */ -(void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didCompleteWithError:(NSError *)error { NSLog(@"didCompleteWithError"); } @end
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