{"rsdb":{"rid":"180133","subhead":"","postdate":"0","aid":"130623","fid":"89","uid":"1","topic":"1","content":"<div id=\"cnblogs_post_body\">\n <p>\u5148\u4e0a\u6548\u679c\u56fe\uff1b<\/p> \n <p><img src=\"https:\/\/www.cppentry.com\/upload_files\/article\/89\/1_9wnh7__.gif\" alt=\"\" \/>&nbsp; &nbsp; &nbsp;&nbsp;<img src=\"https:\/\/www.cppentry.com\/upload_files\/article\/89\/1_e3lyw__.gif\" alt=\"\" width=\"320\" height=\"354\" \/><\/p> \n <p>\u529f\u80fd\uff1a<\/p> \n <p>\uff0d\u5355\u4e2a\u4efb\u52a1\u4e0b\u8f7d<\/p> \n <p>\uff0d\u6682\u505c\u4e0b\u8f7d\u4efb\u52a1<\/p> \n <p>\uff0d\u53d6\u6d88\u4e0b\u8f7d\u4efb\u52a1<\/p> \n <p>\uff0d\u65ad\u70b9\u4e0b\u8f7d<\/p> \n <p>\uff0d\u663e\u793a\u4e0b\u8f7d\u8fdb\u5ea6\u53ca\u901f\u5ea6<\/p> \n <p>\uff0d\u591a\u4efb\u52a1\u4e0b\u8f7d<\/p> \n <p>\uff0d\u5206\u522b\u63a7\u5236\u5404\u4e2a\u4efb\u52a1<\/p> \n <p>&nbsp;<\/p> \n <p>\u5728\u5982\u4eca\u79fb\u52a8\u4e92\u8054\u7f51\u7684\u6d6a\u6f6e\u4e2d\uff0c\u624b\u673aAPP\u8d8a\u6765\u8d8a\u4f9d\u8d56\u7f51\u7edc\u901a\u8baf\u6765\u4ea4\u4e92\u6570\u636e\u3002\u4eca\u5929\u6211\u4eec\u5c31\u6765\u5206\u4eab\u4e0b\u5982\u4f55\u901a\u8fc7\u4f7f\u7528NSURLSession\u8fd9\u4e2aApple\u5b98\u65b9\u63d0\u4f9b\u7684\u7f51\u7edc\u63a5\u53e3\u5b9e\u73b0\u6587\u4ef6\u4e0b\u8f7d\u7684\u601d\u8def\u3002<\/p> \n <p>&nbsp;<\/p> \n <p><strong><span style=\"font-size: 18pt;\">NSURLSsession<\/span><\/strong><\/p> \n <p>&nbsp;<\/p> \n <p>\u5148\u6765\u4ecb\u7ecd\u4e0bNSURLSession\u8fd9\u4e2a\u63a5\u53e3\u3002NSURLSession\u662f\u82f9\u679c\u5728WWDC2013\u4e0a\u63a8\u51fa\u7684\u7528\u4e8e\u66ff\u4ee3\u5b83\u7684\u524d\u8f88NSURLConnection\u7684\u3002<\/p> \n <p>\u4e0eNSURLConnection\u7c7b\u4f3c\uff0c\u9664\u4e86\u540c\u540d\u7c7bNSURLSession\uff0cNSURLSession\u4e5f\u662f\u6307\u4e00\u7ec4\u76f8\u4e92\u4f9d\u8d56\u7684\u7c7b\u3002NSURLSession\u5305\u62ec\u4e0e\u4e4b\u524d\u76f8\u540c\u7684\u7ec4\u4ef6\uff0c\u4f8b\u5982NSURLRequest, NSURLCache\u7b49\u3002NSURLSession\u7684\u4e0d\u540c\u4e4b\u5904\u5728\u4e8e\uff0c\u5b83\u628a NSURLConnection\u66ff\u6362\u4e3aNSURLSession, NSURLSessionConfiguration\uff0c\u4ee5\u53ca3\u4e2aNSURLSessionTask\u7684\u5b50\u7c7b\uff1aNSURLSessionDataTask, NSURLSessionUploadTask, \u548cNSURLSessionDownloadTask\u3002<\/p> \n <p><br \/>\u4e0eNSURLConnection\u76f8\u6bd4\uff0cNSURLSession\u6700\u76f4\u63a5\u7684\u6539\u5584\u5c31\u662f\u63d0\u4f9b\u4e86\u914d\u7f6e\u6bcf\u4e2a\u4f1a\u8bdd\u7684\u7f13\u5b58\uff0c\u534f\u8bae\uff0ccookie\u548c\u8bc1\u4e66\u653f\u7b56\uff08credential policies\uff09\uff0c\u751a\u81f3\u8de8\u5e94\u7528\u7a0b\u5e8f\u5171\u4eab\u5b83\u4eec\u7684\u80fd\u529b\u3002\u8fd9\u4f7f\u5f97\u6846\u67b6\u7684\u7f51\u7edc\u57fa\u7840\u67b6\u6784\u548c\u90e8\u5206\u5e94\u7528\u7a0b\u5e8f\u72ec\u7acb\u5de5\u4f5c\uff0c\u800c\u4e0d\u4f1a\u4e92\u76f8\u5e72\u6270\u3002\u6bcf\u4e00\u4e2aNSURLSession\u5bf9\u8c61\u90fd\u662f\u6839\u636e\u4e00\u4e2aNSURLSessionConfiguration\u521d\u59cb\u5316\u7684\uff0c\u8be5NSURLSessionConfiguration\u6307\u5b9a\u4e86\u4e0a\u9762\u63d0\u5230\u7684\u653f\u7b56\uff0c\u4ee5\u53ca\u4e00\u7cfb\u5217\u4e3a\u4e86\u63d0\u9ad8\u79fb\u52a8\u8bbe\u5907\u6027\u80fd\u800c\u4e13\u95e8\u6dfb\u52a0\u7684\u65b0\u9009\u9879\u3002<\/p> \n <p><br \/>NSURLSession\u7684\u53e6\u4e00\u91cd\u8981\u7ec4\u6210\u90e8\u5206\u662f\u4f1a\u8bdd\u4efb\u52a1\uff0c\u5b83\u8d1f\u8d23\u5904\u7406\u6570\u636e\u7684\u52a0\u8f7d\uff0c\u4ee5\u53ca\u5ba2\u6237\u7aef\u4e0e\u670d\u52a1\u5668\u4e4b\u95f4\u7684\u6587\u4ef6\u548c\u6570\u636e\u7684\u4e0a\u4f20\u4e0b\u8f7d\u670d\u52a1\u3002NSURLSessionTask\u4e0eNSURLConnection\u662f\u53ca\u5176\u76f8\u4f3c\u7684\uff0c\u56e0\u4e3a\u5b83\u8d1f\u8d23\u52a0\u8f7d\u6570\u636e\uff0c\u800c\u4e3b\u8981\u7684\u533a\u522b\u5728\u4e8e\uff0c\u4efb\u52a1\u5171\u4eab\u5b83\u4eec\u7236\u7c7bNSURLSession\u7684\u5171\u540c\u59d4\u6258\uff08common delegate\uff09\u3002<\/p> \n <p>&nbsp;<\/p> \n <p>NSURLSession\u652f\u6301\u4ee5\u4e0b\u4e09\u79cd\u4f1a\u8bdd\u6a21\u5f0f\uff1a<\/p> \n <p><img src=\"https:\/\/www.cppentry.com\/upload_files\/article\/89\/1_2pdz8__.png\" alt=\"\" \/><\/p> \n <p>1\u3001\u9ed8\u8ba4\u4f1a\u8bdd\u6a21\u5f0f\uff08default\uff09\uff1a\u9ed8\u8ba4\u6a21\u5f0f\uff0c\u57fa\u4e8e\u78c1\u76d8\u7f13\u5b58\u7684\u6301\u4e45\u5316\u7b56\u7565\uff0c\u4f7f\u7528\u7528\u6237keychain\u4e2d\u4fdd\u5b58\u7684\u8bc1\u4e66\u8fdb\u884c\u8ba4\u8bc1\u6388\u6743\u3002<\/p> \n <p>2\u3001\u77ac\u65f6\u4f1a\u8bdd\u6a21\u5f0f\uff08ephemeral\uff09\uff1a\u4e0d\u50a8\u5b58\u4efb\u4f55\u6570\u636e\u5728\u78c1\u76d8\u4e2d\uff0c\u6240\u6709\u6570\u636e\u90fd\u4fdd\u5b58\u5728RAM\u4e2d\uff0c\u5f53\u4f1a\u8bdd\u7ed3\u675f\u540e\uff0c\u7f13\u5b58\u6570\u636e\u5c06\u88ab\u6e05\u7a7a\u3002<\/p> \n <p>3\u3001\u540e\u53f0\u4f1a\u8bdd\u6a21\u5f0f\uff08background\uff09\uff1a\u8be5\u6a21\u5f0f\u7c7b\u4f3c\u4e8e\u9ed8\u8ba4\u6a21\u5f0f\uff0c\u53ea\u662f\u5c06\u4e0a\u4f20\u548c\u4e0b\u8f7d\u79fb\u81f3\u540e\u53f0\u5904\u7406\uff0c\u9700\u8981\u4e00\u4e2a\u63d0\u4f9b\u4e00\u4e2aString\u7528\u4e8e\u6807\u8bc6\u540e\u53f0\u4f1a\u8bdd\u3002<\/p> \n <p>NSURLSession\u540c\u65f6\u4e5f\u63d0\u4f9b\u4e86\u5927\u91cf\u7684\u914d\u7f6e\u9009\u9879\uff1a<\/p> \n <p><img src=\"https:\/\/www.cppentry.com\/upload_files\/article\/89\/1_ue3wi__.png\" alt=\"\" \/>&nbsp;<img src=\"https:\/\/www.cppentry.com\/upload_files\/article\/89\/1_kdafq__.png\" alt=\"\" \/><\/p> \n <p>&nbsp;<\/p> \n <p>\u914d\u7f6e\u5b8c\u4f1a\u8bdd\u7c7b\u578b\u540e\uff0c\u5c31\u53ef\u4ee5\u83b7\u53d6NSURLSession\u5bf9\u8c61\u4e86\u3002\u83b7\u53d6\u5bf9\u8c61\u7684\u65b9\u6cd5\u6709\u4ee5\u4e0b\u51e0\u79cd\uff1a&nbsp;<\/p> \n <p><img src=\"https:\/\/www.cppentry.com\/upload_files\/article\/89\/1_vb1fj__.png\" alt=\"\" \/><\/p> \n <p>1\u3001sharedSession\u83b7\u53d6\u7684\u4f1a\u8bdd\u4f7f\u7528\u7684\u662f\u9ed8\u8ba4\u914d\u7f6e\uff08default\uff09\uff0c\u5168\u5c40\u5171\u4eab\u7684Cookies\uff0cCache\u548c\u8bc1\u4e66\u3002<\/p> \n <p>2\u3001\u4f7f\u7528\u6784\u9020\u5668\u6784\u9020\u4e00\u4e2a\u6307\u5b9a\u914d\u7f6e\u7684\u4f1a\u8bdd\u5bf9\u8c61\u3002<\/p> \n <p>3\u3001 \u4f7f\u7528\u6784\u9020\u5668\u6784\u9020\u4e00\u4e2a\u6307\u5b9a\u914d\u7f6e\u5bf9\u8c61\uff0c\u5e76\u6307\u5b9a\u4ee3\u7406\u53ca\u4ee3\u7406\u5217\u961f\u3002<\/p> \n <p>&nbsp;<\/p> \n <p>\u83b7\u53d6\u5b8c\u4f1a\u8bdd\u5bf9\u8c61\u540e\u5c31\u8be5\u7ed9\u5bf9\u8c61\u4e00\u4e2a\u4f1a\u8bdd\u4efb\u52a1\u4e86\u3002\u5728\u8fd9\u91cc\u662f\u901a\u8fc7\u5efa\u7acb\u4e00\u4e2a\u4f1a\u8bdd\u4efb\u52a1\u5bf9\u8c61\u6765\u5b9e\u73b0\u5e03\u7f6e\u4efb\u52a1\u7684\u3002\u5728\u4e00\u4e2a\u4f1a\u8bdd\u4e2d\uff0cNSURLSession\u652f\u6301\u4e09\u79cd\u4f1a\u8bdd\u4efb\u52a1\uff1a<\/p> \n <p>&nbsp;<\/p> \n <p>1\u3001\u6570\u636e\u4efb\u52a1\uff08NSURLSessionDataTask\uff09<\/p> \n <p>\u4f7f\u7528NSData\u5bf9\u8c61\u6765\u53d1\u9001\u548c\u63a5\u6536\u6570\u636e\u3002\u6570\u636e\u4efb\u52a1\u53ef\u4ee5\u5206\u7247\u8fd4\u56de\u6570\u636e\uff0c\u4e5f\u53ef\u4ee5\u901a\u8fc7\u5b8c\u6210\u5904\u7406\u5668\u4e00\u6b21\u6027\u8fd4\u56de\u6570\u636e\u3002\u7531\u4e8e\u6570\u636e\u4efb\u52a1\u4e0d\u5b58\u50a8\u6570\u636e\u5230\u6587\u4ef6\uff0c\u6240\u4ee5\u4e0d\u652f\u6301\u540e\u53f0\u4f1a\u8bdd\u3002<\/p> \n <p><img src=\"https:\/\/www.cppentry.com\/upload_files\/article\/89\/1_kcbcl__.png\" alt=\"\" \/><\/p> \n <p>&nbsp;<\/p> \n <p>2\u3001\u4e0a\u4f20\u4efb\u52a1\uff08NSURLSessionUploadTask\uff09<\/p> \n <p>\u901a\u5e38\u4ee5\u6587\u4ef6\u7684\u5f62\u5f0f\u53d1\u9001\u6570\u636e\uff0c\u652f\u6301\u540e\u53f0\u4e0a\u4f20\u3002<\/p> \n <p><img src=\"https:\/\/www.cppentry.com\/upload_files\/article\/89\/1_n9tlv__.png\" alt=\"\" \/><\/p> \n <p>&nbsp;<\/p> \n <p>3\u3001\u4efb\u52a1\uff08NSURLSessionDownloadTask\uff09<\/p> \n <p>\u4ee5\u6587\u4ef6\u7684\u5f62\u5f0f\u63a5\u6536\u6570\u636e\uff0c\u5f53\u7a0b\u5e8f\u4e0d\u8fd0\u884c\u65f6\u652f\u6301\u540e\u53f0\u4e0b\u8f7d<\/p> \n <p><img src=\"https:\/\/www.cppentry.com\/upload_files\/article\/89\/1_hk647__.png\" alt=\"\" \/><\/p> \n <p>&nbsp;<\/p> \n <p>\u83b7\u5f97\u4efb\u52a1\u5bf9\u8c61\u540e\uff0c\u5c31\u53ef\u4ee5\u5bf9\u5b83\u8fdb\u884c\u5982\u4e0b\u64cd\u4f5c\uff1a<\/p> \n <p><img src=\"https:\/\/www.cppentry.com\/upload_files\/article\/89\/1_dg9x3__.png\" alt=\"\" \/><\/p> \n <p>&nbsp;<\/p> \n <p>\u901a\u8fc7\u5bf9NSURLSession\u7684\u7b80\u5355\u4ecb\u7ecd\uff0c\u5927\u5bb6\u5e94\u8be5\u5bf9\u5176\u6709\u4e86\u6b4c\u7b80\u5355\u7684\u8ba4\u8bc6\uff0c\u63a5\u4e0b\u5c31\u6765\u4ecb\u7ecd\u4e0b\u5982\u4f55\u5b9e\u73b0\u672c\u6587\u5f00\u59cb\u9636\u6bb5\u6240\u5c55\u793aDemo\u7684\u6240\u6709\u529f\u80fd\u3002<\/p> \n <p>&nbsp;<\/p> \n <p><strong><span style=\"font-size: 18pt;\">Demo\u8be6\u89e3<\/span><\/strong><\/p> \n <p>&nbsp;<\/p> \n <p>\u5148\u505a\u4e00\u4e9b\u51c6\u5907\u5de5\u4f5c\uff1a<\/p> \n <p>\u521b\u5efa\u4e00\u4e2a\u7528\u4e8e\u5b58\u653e\u4e0b\u8f7d\u6570\u636e\u4fe1\u606f\u7684struct DownloadData<\/p> \n <p><img src=\"https:\/\/www.cppentry.com\/upload_files\/article\/89\/1_yyaj4__.png\" alt=\"\" \/><\/p> \n <p>&nbsp;<\/p> \n <p>\u521b\u5efa\u4e00\u4e2a\u4ee3\u7406\u534f\u8bae\uff0c\u4e4b\u540e\u4f1a\u4ecb\u7ecd\u5b83\u7684\u7528\u5904<\/p> \n <p><img src=\"https:\/\/www.cppentry.com\/upload_files\/article\/89\/1_m31bg__.png\" alt=\"\" \/><\/p> \n <p>&nbsp;<\/p> \n <p>\u63a5\u7740\u6211\u4eec\u5f00\u59cb\u5efa\u7acb\u4e00\u4e2a\u81ea\u5df1\u7684DownloadTask\u7c7b\uff0c\u7528\u6765\u5b9e\u73b0\u4e0b\u8f7dDownloadData\uff0c\u5e76\u63d0\u4f9b\u6682\u505c\u4efb\u52a1\u3001\u65ad\u70b9\u4e0b\u8f7d\u3001\u53d6\u6d88\u4efb\u52a1\u3001\u5b9e\u65f6\u66f4\u65b0\u4e0b\u8f7d\u8fdb\u5ea6\u53ca\u901f\u5ea6\u7b49\u529f\u80fd\uff1a<\/p> \n <p>\u6211\u4eec\u5148\u6765\u5b9a\u4e49\u4e00\u4e9b\u5c5e\u6027\uff0c<\/p> \n <p><img src=\"https:\/\/www.cppentry.com\/upload_files\/article\/89\/1_3varj__.png\" alt=\"\" \/><\/p> \n <p>\u5176\u4e2d\uff0c<\/p> \n <p>\u4ee3\u7406\u662f\u7528\u4e8e\u89e6\u53d1\u4e4b\u524d\u534f\u8bae\u4e2d\u6240\u5b9a\u4e49\u7684\u65b9\u6cd5\u7684\uff0c<\/p> \n <p>\u6570\u7ec4\u548c\u8ba1\u65f6\u5668\u6d8c\u6765\u8ba1\u7b97\u4e0b\u8f7d\u901f\u5ea6\u7684\uff0c<\/p> \n <p>\u4e0b\u8f7d\u4efb\u52a1id\u662f\u4e3a\u4e86\u65b9\u4fbf\u7ba1\u7406\u591a\u4e2a\u4efb\u52a1\u3002<\/p> \n <p>&nbsp;<\/p> \n <p>\u63a5\u7740\u662f\u6784\u9020\u5668\uff0c<\/p> \n <p><img src=\"https:\/\/www.cppentry.com\/upload_files\/article\/89\/1_fcfpy__.png\" alt=\"\" \/><\/p> \n <p>\u901a\u8fc7\u6784\u9020\u5668\u6211\u4eec\u5c06\u4ece\u5916\u90e8\u83b7\u5f97DownloadData\uff0cid\u53cadelegate\u3002<\/p> \n <p>&nbsp;<\/p> \n <p>\u5b8c\u6210\u4e86\u8fd9\u4e9b\u540e\uff0c\u5c31\u662f\u7f16\u5199\u4e0b\u8f7d\u65b9\u6cd5\u4e86\uff0c<\/p> \n <p><img src=\"https:\/\/www.cppentry.com\/upload_files\/article\/89\/1_vuxdo__.png\" alt=\"\" \/><\/p> \n <p>\u8fd9\u91cc\u5c06\u81ea\u8eab\u8bbe\u7f6e\u4e3aNSURLSession\u4ee3\u7406\u540e\uff0c\u5c31\u9700\u8981\u5728\u7c7b\u4e2d\u9075\u5faaNSURLSessionDownloadDelegate\u534f\u8bae\uff0c\u5e76\u5b9e\u73b0\u5176\u65b9\u6cd5\u3002<\/p> \n <p>\u5728\u8fd9\u91cc\u6211\u5b9e\u73b0\u5982\u4e0b\u65b9\u6cd5\uff0c<\/p> \n <p><img src=\"https:\/\/www.cppentry.com\/upload_files\/article\/89\/1_syg0d__.png\" alt=\"\" \/><\/p> \n <p><img src=\"https:\/\/www.cppentry.com\/upload_files\/article\/89\/1_gqfpd__.png\" alt=\"\" \/><\/p> \n <p>\u5f53\u7136\uff0c\u5728\u6784\u9020task\u65f6\u4e5f\u53ef\u4ee5\u4f7f\u7528\u5e26block\u7684\u6784\u9020\u5668\uff0c\u5c06task\u5b8c\u6210\u540e\u6240\u8981\u6267\u884c\u7684\u64cd\u4f5c\u901a\u8fc7\u95ed\u5305\u7684\u65b9\u5f0f\u4f20\u7ed9task\u3002\u8fd9\u6837\u505a\u7684\u8bdd\u5728\u5b9a\u4e49NSURLSession\u4e2d\u5c31\u65e0\u9700\u8bbe\u7f6e\u4ee3\u7406\u4e86\u3002\u4f46\u662f\uff0c\u4e0d\u4f7f\u7528\u4ee3\u7406\u7684\u65b9\u6cd5\u662f\u65e0\u6cd5\u83b7\u53d6\u5230\u4e0b\u8f7d\u4efb\u52a1\u7684\u5b9e\u65f6\u4fe1\u606f\u7684\uff0c\u6545\u8981\u83b7\u53d6\u4e0b\u8f7d\u8fdb\u5ea6\u53ca\u901f\u5ea6\u7684\u8bdd\uff0c\u8fd8\u662f\u5e94\u8be5\u4f7f\u7528NSURLSession\u4ee3\u7406\u3002<\/p> \n <p>\u5982\u679ccompletionhandler \u95ed\u5305\u548c didFinishDownloadingToURL \u65b9\u6cd5\u540c\u65f6\u5b58\u5728\u7684\u8bdd\uff0c\u4f18\u5148\u6267\u884ccompletionhandler\uff0c\u5e76\u4f1a\u5ffd\u7565didFinishDownloadingToURL\u65b9\u6cd5\u3002<\/p> \n <p>&nbsp;<\/p> \n <p>\u4e0b\u9762\u662f\u5b9e\u73b0\u5b9e\u65f6\u901f\u5ea6\u66f4\u65b0\u7684\u65b9\u6cd5\uff0c<\/p> \n <p><img src=\"https:\/\/www.cppentry.com\/upload_files\/article\/89\/1_lmkdg__.png\" alt=\"\" \/><\/p> \n <p>&nbsp;<\/p> \n <p>\u7136\u540e\u662f\u6682\u505c\u4efb\u52a1\u65b9\u6cd5\uff0c<\/p> \n <p><img src=\"https:\/\/www.cppentry.com\/upload_files\/article\/89\/1_cr5ip__.png\" alt=\"\" \/><\/p> \n <p>\u8fd9\u91cc\u8981\u6ce8\u610f\u7684\u662f\uff0ccancelByProducingResumeData \u751f\u6210\u7684NSData\u4e2d\u5305\u542b\u7684\u5e76\u4e0d\u662f\u4e4b\u524d\u6240\u4e0b\u8f7d\u7684\u6570\u636e\uff0c\u800c\u662f\u8bb0\u5f55\u4e0b\u8f7d\u4ea7\u751f\u7684\u4e34\u65f6\u6587\u4ef6\u7684\u4f4d\u7f6e\u53ca\u4e0b\u8f7d\u5230\u4ec0\u4e48\u8fdb\u5ea6\u7684\u4fe1\u606f\uff0c\u6240\u4ee5\u5e76\u4e0d\u4f1a\u5360\u7528\u5f88\u5927\u7684\u5185\u5b58\u3002<\/p> \n <p>\u4efb\u52a1\u6682\u505c\u540e\uff0c\u5c06\u6b64\u6b21\u4efb\u52a1\u6e05\u7a7a\u3002<\/p> \n <p>&nbsp;<\/p> \n <p>\u6700\u540e\u662f\u53d6\u6d88\u4efb\u52a1\u65b9\u6cd5\uff0c<\/p> \n <p><img src=\"https:\/\/www.cppentry.com\/upload_files\/article\/89\/1_xd3lm__.png\" alt=\"\" \/><\/p> \n <p>\u6e05\u7a7a\u8bb0\u5f55\u4e0b\u8f7d\u4fe1\u606f\u6570\u636e\u6587\u4ef6\u540e\uff0c\u518d\u6b21\u5f00\u59cb\u4efb\u52a1\u5c31\u4e0d\u80fd\u7ee7\u7eed\u4ece\u4e4b\u524d\u65ad\u5f00\u7684\u4f4d\u7f6e\u7ee7\u7eed\u4e0b\u8f7d\u4e86\u3002<\/p> \n <p>&nbsp;<\/p> \n <p>\u4ee5\u4e0a\u5c31\u662fDownloadTask\u7c7b\u7684\u5168\u90e8\u5185\u5bb9\u4e86\uff0c \u6700\u540e\u5c31\u662f\u5efa\u7acb\u4e00\u4e2aUI\u8c03\u7528\u4e0bDownloadTask\uff0c\u770b\u770b\u8fd9\u4e2a\u7c7b\u5728\u5b9e\u9645\u4f7f\u7528\u4e2d\u7684\u6548\u679c\u5982\u4f55\u3002<\/p> \n <p>UI\uff1a<\/p> \n <p><img src=\"https:\/\/www.cppentry.com\/upload_files\/article\/89\/1_ls9st__.png\" alt=\"\" \/><\/p> \n <p>&nbsp;<\/p> \n <p>\u4ece0-5\u4f9d\u6b21\u7f16\u53f7\u63a7\u4ef6\uff0c\u5305\u62ec1\u4e2aprogressView\uff0c2\u4e2alabel\uff0c3button\uff0c\u5e76\u628a\u4ed6\u4eec\u5206\u522b\u653e\u5165collection\u4e2d\uff0c\u5982\u56fe\uff1a<\/p> \n <p><img src=\"https:\/\/www.cppentry.com\/upload_files\/article\/89\/1_ootqf__.png\" alt=\"\" \/><\/p> \n <p>&nbsp;<\/p> \n <p>\u5b9a\u4e49\u4e00\u4e2ataskCollection\u7528\u4e8e\u5b58\u653e\u6240\u6709task\uff0c\u5982\u56fe\uff1a<\/p> \n <p><img src=\"https:\/\/www.cppentry.com\/upload_files\/article\/89\/1_h1zgo__.png\" alt=\"\" \/><\/p> \n <p>&nbsp;<\/p> \n <p>\u521d\u59cb\u5316\u754c\u9762\uff0c\u5e76\u5b9a\u4e496\u4e2aDownloadTask\uff1a<\/p> \n <p><img src=\"https:\/\/www.cppentry.com\/upload_files\/article\/89\/1_km19b__.png\" alt=\"\" \/><\/p> \n <p>&nbsp;<\/p> \n <p>\u66ff3\u79cdbutton\u5206\u522b\u6dfb\u52a0\u65b9\u6cd5\uff1a<\/p> 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