＆lt; p＆gt; AFNetworking 3.0 downtask。下载内存中的数据将始终导致内存爆炸。＆lt; / p＆gt;
＆lt; pre＆gt;＆lt; code＆gt; NSURLSessionConfiguration * configuration = [NSURLSessionConfiguration defaultSessionConfiguration];
AFURLSessionManager * manager = [[AFURLSessionManager alloc] initWithSessionConfiguration：configuration];
NSURL * URL = [NSURL URLWithString：@＆＃34; http：//dlsw.baidu.com/sw-search-sp/soft/9d/25765/sogou_mac_32c_V3.2.0.1437101586.dmg"];
NSURLRequest * request = [NSURLRequest requestWithURL：URL];
_downloadTask = [manager downloadTaskWithRequest：请求进度：^（NSProgress * _Nonnull downloadProgress）{
dispatch_async（dispatch_get_main_queue（），^ {
[progressview setProgress：downloadProgress.fractionCompleted animated：YES];
dispatch_after（dispatch_time（DISPATCH_TIME_NOW，（int64_t）（0.3 * NSEC_PER_SEC）），dispatch_get_main_queue（），^ {
str = [NSString stringWithFormat：@＆＃34;％。2f＆＃34 ;,downloadProgress.fractionCompleted * 100];
lab.text = STR;
}）;
}）;
} destination：^ NSURL * _Nonnull（NSURL * _Nonnull targetPath，NSURLResponse * _Nonnull response）{
NSURL * documentsDirectoryURL = [[NSFileManager defaultManager] URLForDirectory：NSDocumentDirectory inDomain：NSUserDomainMask properForURL：targetPath create：NO error：nil];
return [documentsDirectoryURL URLByAppendingPathComponent：[response suggestedFilename]];
} completionHandler：^（NSURLResponse * _Nonnull响应，NSURL * _Nullable filePath，NSError * _Nullable错误）{
NSLog（@＆＃34;文件下载到：％@＆＃34;，filePath）;
}];
＆LT; /代码＆GT;＆LT; /预＆GT;
＆lt; p＆gt;＆lt; img src =＆＃34; https://i.stack.imgur.com/uGeFg.jpg" ALT =＆＃34;一个＆＃34;＆GT;＆LT; / p为H.
＆lt; p＆gt;＆lt; img src =＆＃34; https://i.stack.imgur.com/FprKL.jpg" ALT =＆＃34;三＆＃34;＆GT;＆LT; / p为H.