//  ViewController.m//  05-掌握-大文件下载#import "ViewController.h"@interface ViewController () <NSURLSessionDownloadDelegate>@end@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad];    // Do any additional setup after loading the view, typically from a nib.}- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {    [self download];}- (void)download{    // 获得NSURLSession对象    NSURLSession *session = [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration] delegate:self delegateQueue:[[NSOperationQueue alloc] init]];        // 获得下载任务    NSURLSessionDownloadTask *task = [session downloadTaskWithURL:[NSURL URLWithString:@"http://120.25.226.186:32812/resources/videos/minion_01.mp4"]];        // 启动任务    [task resume];}#pragma mark - <NSURLSessionDownloadDelegate>- (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didCompleteWithError:(NSError *)error{    NSLog(@"didCompleteWithError");}- (void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTask *)downloadTask didResumeAtOffset:(int64_t)fileOffset expectedTotalBytes:(int64_t)expectedTotalBytes{    NSLog(@"didResumeAtOffset");}/** * 每当写入数据到临时文件时，就会调用一次这个方法 * totalBytesExpectedToWrite:总大小 * totalBytesWritten: 已经写入的大小 * bytesWritten: 这次写入多少 */- (void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTask *)downloadTask didWriteData:(int64_t)bytesWritten totalBytesWritten:(int64_t)totalBytesWritten totalBytesExpectedToWrite:(int64_t)totalBytesExpectedToWrite{    NSLog(@"--------%f", 1.0 * totalBytesWritten / totalBytesExpectedToWrite);}/** *  * 下载完毕就会调用一次这个方法 */- (void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTask *)downloadTask didFinishDownloadingToURL:(NSURL *)location{    // 文件将来存放的真实路径    NSString *file = [[NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject] stringByAppendingPathComponent:downloadTask.response.suggestedFilename];        // 剪切location的临时文件到真实路径    NSFileManager *mgr = [NSFileManager defaultManager];    [mgr moveItemAtURL:location toURL:[NSURL fileURLWithPath:file] error:nil];}@end

////  ViewController.m//  05-掌握-大文件下载#import "ViewController.h"@interface ViewController () <NSURLSessionDownloadDelegate>/** 下载任务 */@property (nonatomic, strong) NSURLSessionDownloadTask *task;@end@implementation ViewController/** * 开始下载 */- (IBAction)start:(id)sender {    // 获得NSURLSession对象    NSURLSession *session = [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration] delegate:self delegateQueue:[[NSOperationQueue alloc] init]];        // 获得下载任务    self.task = [session downloadTaskWithURL:[NSURL URLWithString:@"http://120.25.226.186:32812/resources/videos/minion_01.mp4"]];        // 启动任务    [self.task resume];}/** * 暂停下载 */- (IBAction)pause:(id)sender {    [self.task suspend];}/** * 继续下载 */- (IBAction)goOn:(id)sender {    [self.task resume];}#pragma mark - <NSURLSessionDownloadDelegate>- (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didCompleteWithError:(NSError *)error{    NSLog(@"didCompleteWithError");}- (void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTask *)downloadTask didResumeAtOffset:(int64_t)fileOffset expectedTotalBytes:(int64_t)expectedTotalBytes{    NSLog(@"didResumeAtOffset");}/** * 每当写入数据到临时文件时，就会调用一次这个方法 * totalBytesExpectedToWrite:总大小 * totalBytesWritten: 已经写入的大小 * bytesWritten: 这次写入多少 */- (void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTask *)downloadTask didWriteData:(int64_t)bytesWritten totalBytesWritten:(int64_t)totalBytesWritten totalBytesExpectedToWrite:(int64_t)totalBytesExpectedToWrite{    NSLog(@"--------%f", 1.0 * totalBytesWritten / totalBytesExpectedToWrite);}/** *  * 下载完毕就会调用一次这个方法 */- (void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTask *)downloadTask didFinishDownloadingToURL:(NSURL *)location{    // 文件将来存放的真实路径    NSString *file = [[NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject] stringByAppendingPathComponent:downloadTask.response.suggestedFilename];        // 剪切location的临时文件到真实路径    NSFileManager *mgr = [NSFileManager defaultManager];    [mgr moveItemAtURL:location toURL:[NSURL fileURLWithPath:file] error:nil];}@end

//  ViewController.m//  05-掌握-大文件下载// resumeData的文件路径#define XMGResumeDataFile [[NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject] stringByAppendingPathComponent:@"resumeData.tmp"]#import "ViewController.h"@interface ViewController () <NSURLSessionDownloadDelegate>/** 下载任务 */@property (nonatomic, strong) NSURLSessionDownloadTask *task;/** 保存上次的下载信息 */@property (nonatomic, strong) NSData *resumeData;/** session */@property (nonatomic, strong) NSURLSession *session;@end@implementation ViewController- (NSURLSession *)session{    if (!_session) {        _session = [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration] delegate:self delegateQueue:[[NSOperationQueue alloc] init]];    }    return _session;}//- (NSData *)resumeData//{//    if (!_resumeData) {//        _resumeData = http://www.mamicode.com/[NSData dataWithContentsOfFile:XMGResumeDataFile];>//    }//    return _resumeData;//}/** * 开始下载 */- (IBAction)start:(id)sender {//    if (self.resumeData) {//        // 获得上次的下载任务//        self.task = [self.session downloadTaskWithResumeData:self.resumeData];//        //        // 将上次的临时文件放到tmp中//        //    } else {        // 获得下载任务        self.task = [self.session downloadTaskWithURL:[NSURL URLWithString:@"http://120.25.226.186:32812/resources/videos/minion_01.mp4"]];//    }        // 启动任务    [self.task resume];}/** * 暂停下载 */- (IBAction)pause:(id)sender {    // 一旦这个task被取消了，就无法再恢复    [self.task cancelByProducingResumeData:^(NSData *resumeData) {        self.resumeData = resumeData;        ////        // 可以将resumeData写入沙盒，保存起来//        // 下次进入程序，就可以将resumeData读取进来，继续下载//        [resumeData writeToFile:XMGResumeDataFile atomically:YES];//        //        // caches文件夹//        NSString *caches = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject];//        //        // 缓存文件//        NSString *tmp = NSTemporaryDirectory();//        NSFileManager *mgr = [NSFileManager defaultManager];//        NSArray *subpaths = [mgr subpathsAtPath:tmp];//        NSString *file = [tmp stringByAppendingPathComponent:[subpaths lastObject]];//        NSString *cachesTempFile = [caches stringByAppendingPathComponent:[file lastPathComponent]];//        [mgr moveItemAtPath:file toPath:cachesTempFile error:nil];//        //        [@{@"tempFile" : cachesTempFile} writeToFile:[caches stringByAppendingPathComponent:@"tempFile.plist"] atomically:YES];    }];}/**x 请求这个路径：http://120.25.226.186:32812/resources/videos/minion_01.mp4 设置请求头 Range : 1024-2000 *//** * 继续下载 */- (IBAction)goOn:(id)sender {    self.task = [self.session downloadTaskWithResumeData:self.resumeData];    [self.task resume];}#pragma mark - <NSURLSessionDownloadDelegate>- (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didCompleteWithError:(NSError *)error{    NSLog(@"didCompleteWithError");        // 保存恢复数据    self.resumeData =http://www.mamicode.com/ error.userInfo[NSURLSessionDownloadTaskResumeData];}- (void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTask *)downloadTask didResumeAtOffset:(int64_t)fileOffset expectedTotalBytes:(int64_t)expectedTotalBytes{    NSLog(@"didResumeAtOffset");}/** * 每当写入数据到临时文件时，就会调用一次这个方法 * totalBytesExpectedToWrite:总大小 * totalBytesWritten: 已经写入的大小 * bytesWritten: 这次写入多少 */- (void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTask *)downloadTask didWriteData:(int64_t)bytesWritten totalBytesWritten:(int64_t)totalBytesWritten totalBytesExpectedToWrite:(int64_t)totalBytesExpectedToWrite{    NSLog(@"--------%f", 1.0 * totalBytesWritten / totalBytesExpectedToWrite);}/** *  * 下载完毕就会调用一次这个方法 */- (void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTask *)downloadTask didFinishDownloadingToURL:(NSURL *)location{    // 文件将来存放的真实路径    NSString *file = [[NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject] stringByAppendingPathComponent:downloadTask.response.suggestedFilename];        // 剪切location的临时文件到真实路径    NSFileManager *mgr = [NSFileManager defaultManager];    [mgr moveItemAtURL:location toURL:[NSURL fileURLWithPath:file] error:nil];}@end