源码0603-05-掌握-大文件下载

//  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

06-掌握-大文件断点下载

//
//  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

07-掌握-大文件断点下载

//  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 = [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 = 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