#import "ViewController.h"@interface ViewController ()@end@implementation ViewController-(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{[self download];
}//优点:不需要担心内存
//缺点:无法监听文件下载进度
-(void)download
{//1.urlNSURL *url = [NSURL URLWithString:@"http://120.25.226.186:32812/resources/images/minion_03.png"];//2.创建请求对象NSURLRequest *request = [NSURLRequest requestWithURL:url];//3.创建sessionNSURLSession *session = [NSURLSession sharedSession];//4.创建Task/*第一个参数:请求对象第二个参数:completionHandler 回调location:文件保存的tmp路径urlresponse:响应头信息error:错误信息因为存在tmp路径，所以随时可能会被删除，所以需要手动移动文件夹来存储下载的文件*///该方法内部已经实现了边接受数据边写沙盒(tmp)的操作NSURLSessionDownloadTask *downloadTask = [session downloadTaskWithRequest:request completionHandler:^(NSURL * _Nullable location, NSURLResponse * _Nullable response, NSError * _Nullable error) {//6.处理数据NSLog(@"%@---%@",location,[NSThread currentThread]);//6.1 拼接文件全路径NSString *fullPath = [[NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject] stringByAppendingPathComponent:response.suggestedFilename];//6.2 剪切文件
        [[NSFileManager defaultManager]moveItemAtURL:location toURL:[NSURL fileURLWithPath:fullPath] error:nil];NSLog(@"%@",fullPath);}];//5.执行Task
    [downloadTask resume];
}@end

#import "ViewController.h"@interface ViewController ()<NSURLSessionDownloadDelegate>@end@implementation ViewController-(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{[self delegate];
}//优点:不需要担心内存
//缺点:无法监听文件下载进度
-(void)download
{//1.urlNSURL *url = [NSURL URLWithString:@"http://120.25.226.186:32812/resources/images/minion_03.png"];//2.创建请求对象NSURLRequest *request = [NSURLRequest requestWithURL:url];//3.创建sessionNSURLSession *session = [NSURLSession sharedSession];//4.创建Task/*第一个参数:请求对象第二个参数:completionHandler 回调location:response:响应头信息error:错误信息*///该方法内部已经实现了边接受数据边写沙盒(tmp)的操作NSURLSessionDownloadTask *downloadTask = [session downloadTaskWithRequest:request completionHandler:^(NSURL * _Nullable location, NSURLResponse * _Nullable response, NSError * _Nullable error) {//6.处理数据NSLog(@"%@---%@",location,[NSThread currentThread]);//6.1 拼接文件全路径NSString *fullPath = [[NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject] stringByAppendingPathComponent:response.suggestedFilename];//6.2 剪切文件
        [[NSFileManager defaultManager]moveItemAtURL:location toURL:[NSURL fileURLWithPath:fullPath] error:nil];NSLog(@"%@",fullPath);}];//5.执行Task
    [downloadTask resume];
}-(void)delegate
{//1.urlNSURL *url = [NSURL URLWithString:@"http://120.25.226.186:32812/resources/images/minion_03.png"];//2.创建请求对象NSURLRequest *request = [NSURLRequest requestWithURL:url];//3.创建sessionNSURLSession *session = [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration] delegate:self delegateQueue:[NSOperationQueue mainQueue]];//4.创建TaskNSURLSessionDownloadTask *downloadTask = [session downloadTaskWithRequest:request];//5.执行Task
    [downloadTask resume];
}#pragma mark ----------------------
#pragma mark NSURLSessionDownloadDelegate
/***  写数据**  @param session                   会话对象*  @param downloadTask              下载任务*  @param bytesWritten              本次写入的数据大小*  @param totalBytesWritten         下载的数据总大小*  @param totalBytesExpectedToWrite  文件的总大小*/
-(void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTask *)downloadTask didWriteData:(int64_t)bytesWritten totalBytesWritten:(int64_t)totalBytesWritten totalBytesExpectedToWrite:(int64_t)totalBytesExpectedToWrite
{//1. 获得文件的下载进度NSLog(@"%f",1.0 * totalBytesWritten/totalBytesExpectedToWrite);
}/***  当恢复下载的时候调用该方法**  @param fileOffset         从什么地方下载*  @param expectedTotalBytes 文件的总大小*/
-(void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTask *)downloadTask didResumeAtOffset:(int64_t)fileOffset expectedTotalBytes:(int64_t)expectedTotalBytes
{NSLog(@"%s",__func__);
}/***  当下载完成的时候调用**  @param location     文件的临时存储路径*/
-(void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTask *)downloadTask didFinishDownloadingToURL:(NSURL *)location
{NSLog(@"%@",location);//1 拼接文件全路径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);
}/***  请求结束*/
-(void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didCompleteWithError:(NSError *)error
{NSLog(@"didCompleteWithError");
}@end

#import "ViewController.h"@interface ViewController ()<NSURLSessionDownloadDelegate>
@property (nonatomic, strong) NSURLSessionDownloadTask *downloadTask;
@property (nonatomic, strong) NSData *resumData;
@property (nonatomic, strong) NSURLSession *session;
@end@implementation ViewController- (IBAction)startBtnClick:(id)sender
{//1.urlNSURL *url = [NSURL URLWithString:@"http://120.25.226.186:32812/resources/videos/minion_01.mp4"];//2.创建请求对象NSURLRequest *request = [NSURLRequest requestWithURL:url];//3.创建sessionNSURLSessionConfiguration *config = [NSURLSessionConfiguration defaultSessionConfiguration];self.session = [NSURLSession sessionWithConfiguration:config delegate:self delegateQueue:[NSOperationQueue mainQueue]];//4.创建TaskNSURLSessionDownloadTask *downloadTask = [self.session downloadTaskWithRequest:request];//5.执行Task
    [downloadTask resume];self.downloadTask = downloadTask;}//暂停是可以恢复
- (IBAction)suspendBtnClick:(id)sender
{NSLog(@"+++++++++++++++++++暂停");[self.downloadTask suspend];
}//cancel:取消是不能恢复
//cancelByProducingResumeData:是可以恢复
- (IBAction)cancelBtnClick:(id)sender
{NSLog(@"+++++++++++++++++++取消");//[self.downloadTask cancel];//恢复下载的数据!=文件数据[self.downloadTask cancelByProducingResumeData:^(NSData * _Nullable resumeData) {self.resumData = resumeData;}];
}- (IBAction)goOnBtnClick:(id)sender
{NSLog(@"+++++++++++++++++++恢复下载");if(self.resumData){self.downloadTask = [self.session downloadTaskWithResumeData:self.resumData];}[self.downloadTask resume];
}//优点:不需要担心内存
//缺点:无法监听文件下载进度
-(void)download
{//1.urlNSURL *url = [NSURL URLWithString:@"http://120.25.226.186:32812/resources/images/minion_03.png"];//2.创建请求对象NSURLRequest *request = [NSURLRequest requestWithURL:url];//3.创建sessionNSURLSession *session = [NSURLSession sharedSession];//4.创建Task/*第一个参数:请求对象第二个参数:completionHandler 回调location:response:响应头信息error:错误信息*///该方法内部已经实现了边接受数据边写沙盒(tmp)的操作NSURLSessionDownloadTask *downloadTask = [session downloadTaskWithRequest:request completionHandler:^(NSURL * _Nullable location, NSURLResponse * _Nullable response, NSError * _Nullable error) {//6.处理数据NSLog(@"%@---%@",location,[NSThread currentThread]);//6.1 拼接文件全路径NSString *fullPath = [[NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject] stringByAppendingPathComponent:response.suggestedFilename];//6.2 剪切文件
        [[NSFileManager defaultManager]moveItemAtURL:location toURL:[NSURL fileURLWithPath:fullPath] error:nil];NSLog(@"%@",fullPath);}];//5.执行Task
    [downloadTask resume];
}#pragma mark ----------------------
#pragma mark NSURLSessionDownloadDelegate
/***  写数据**  @param session                   会话对象*  @param downloadTask              下载任务*  @param bytesWritten              本次写入的数据大小*  @param totalBytesWritten         下载的数据总大小*  @param totalBytesExpectedToWrite  文件的总大小*/
-(void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTask *)downloadTask didWriteData:(int64_t)bytesWritten totalBytesWritten:(int64_t)totalBytesWritten totalBytesExpectedToWrite:(int64_t)totalBytesExpectedToWrite
{//1. 获得文件的下载进度NSLog(@"%f",1.0 * totalBytesWritten/totalBytesExpectedToWrite);
}/***  当恢复下载的时候调用该方法**  @param fileOffset         从什么地方下载*  @param expectedTotalBytes 文件的总大小*/
-(void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTask *)downloadTask didResumeAtOffset:(int64_t)fileOffset expectedTotalBytes:(int64_t)expectedTotalBytes
{NSLog(@"%s",__func__);
}/***  当下载完成的时候调用**  @param location     文件的临时存储路径*/
-(void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTask *)downloadTask didFinishDownloadingToURL:(NSURL *)location
{NSLog(@"%@",location);//1 拼接文件全路径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);
}/***  请求结束*/
-(void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didCompleteWithError:(NSError *)error
{NSLog(@"didCompleteWithError");
}@end