#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.創建請求對象  NSURLRequest *request = [NSURLRequest requestWithURL:url];    //3.創建session ：注意代理為NSURLSessionDownloadDelegate  NSURLSession *session = [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration] delegate:self delegateQueue:[NSOperationQueue mainQueue]];    //4.創建Task  NSURLSessionDownloadTask *downloadTask = [session downloadTaskWithRequest:request];    //5.執行Task  [downloadTask resume];}#pragma mark ----------------------#pragma mark NSURLSessionDownloadDelegate/** * 寫數據 * * @param session          會話對象 * @param downloadTask       下載任務 * @param bytesWritten       本次寫入的數據大小 * @param totalBytesWritten     下載的數據總大小 * @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. 獲得文件的下載進度  NSLog(@"%f",1.0 * totalBytesWritten/totalBytesExpectedToWrite);}/** * 當恢復下載的時候調用該方法 * * @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__);}/** * 當下載完成的時候調用 * * @param location   文件的臨時存儲路徑 */-(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);}/** * 請求結束 */-(void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didCompleteWithError:(NSError *)error{  NSLog(@"didCompleteWithError");}@end