下载网络视频到手机相册

目前我知道有两种方式 

第一种比较简单 

直接把URL 写入文件  再通过 ALAssetsLibrary 保存到相册中

- (void)videoPlay{

    [musicBt startSpin];

    NSString *urlString = [NSString stringWithFormat:@"http://192.168.1.10/shenxu/2.mp4"];

    NSArray *urlStringArray = [urlString componentsSeparatedByString:@"/"];

    NSString *fileName = [urlStringArray lastObject];

    NSString *docDirPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];

    NSString *filePath = [NSString stringWithFormat:@"%@/%@", docDirPath,fileName];

    NSError *error;

    NSFileManager *manager = [NSFileManager defaultManager];

    BOOL writeSuc = [manager fileExistsAtPath:filePath];

    NSData *audioData = [NSData dataWithContentsOfURL:[NSURL URLWithString:urlString]];

    if (writeSuc) {

        [manager removeItemAtPath:filePath error:nil];

    }

    if ([audioData writeToFile:filePath atomically:YES]) {

        NSLog(@"成功");

    } else {

        NSLog(@"失败");

    }

    [self save:filePath];

}

- (void)save:(NSString*)urlString{

    ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];

    [library writeVideoAtPathToSavedPhotosAlbum:[NSURL fileURLWithPath:urlString]

                                completionBlock:^(NSURL *assetURL, NSError *error) {

                                     if (error) {

                                        NSLog(@"Save video fail:%@",error);

                                    } else {

                                        NSLog(@"Save video succeed.");

                                        UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"下载完成" message:nil delegate:self cancelButtonTitle:@"确定" otherButtonTitles:nil];

                                        [alert show];

                                        [musicBt stopSpin];

                                    }

                                }];

}

第二种方式是通过asihttp.....来下载视频到本地   再通过下载的地址string 传到ALAssetsLibrary 相册里

- (void)download{

    NSString *webPath = [NSHomeDirectory() stringByAppendingPathComponent:@"Library/Private Documents/Temp"];

    NSString *cachePath = [NSHomeDirectory() stringByAppendingPathComponent:@"Library/Private Documents/Cache"];

     NSFileManager *fileManager = [NSFileManager defaultManager];

    if(![fileManager fileExistsAtPath:cachePath]){

        [fileManager createDirectoryAtPath:cachePath withIntermediateDirectories:YES attributes:nil error:nil];

    }

    ASIHTTPRequest *request=[[ASIHTTPRequest alloc] initWithURL:[NSURL URLWithString:@"http://192.168.1.10/shenxu/2.mp4"]];

    //下载完存储目录

    [request setDownloadDestinationPath:[cachePath stringByAppendingPathComponent:[NSString stringWithFormat:@"vedio.mp4"]]];

    //临时存储目录

    [request setTemporaryFileDownloadPath:[webPath stringByAppendingPathComponent:[NSString stringWithFormat:@"vedio.mp4"]]];

    [request setDownloadProgressDelegate:self];  //加上去 把进度打印出来

    //断点续载

    [request setAllowResumeForFileDownloads:YES];

    [request startAsynchronous];

    videoRequest = request;

    ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];

    [library writeVideoAtPathToSavedPhotosAlbum:[NSURL fileURLWithPath:request.downloadDestinationPath]

                                completionBlock:^(NSURL *assetURL, NSError *error) {

                                    if (error) {

                                        NSLog(@"Save video fail:%@",error);

                                    } else {

                                        NSLog(@"Save video succeed.");

                                        UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"下载完成" message:nil delegate:self cancelButtonTitle:@"确定" otherButtonTitles:nil];

                                        [alert show];

//                                        [musicBt stopSpin];

                                    }

                                }];

}

#pragma mark - ASIProgressDelegate

- (void)setProgress:(float)newProgress{

    NSLog(@"----- %f ------",newProgress);

    

}

其中需要导入的文件有：Reachability2  ASIHTTPRequest  HttpServer

appdelegate中要写   - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions

{

    

    [DDLog addLogger:[DDTTYLogger sharedInstance]];

        httpServer = [[HTTPServer alloc] init];

    [httpServer setType:@"_http._tcp."];

    

    [httpServer setPort:12345];

    

    NSString *webPath = [NSHomeDirectory() stringByAppendingPathComponent:@"Library/Private Documents/Temp"];

    NSFileManager *fileManager=[NSFileManager defaultManager];

    if(![fileManager fileExistsAtPath:webPath])

    {

        [fileManager createDirectoryAtPath:webPath withIntermediateDirectories:YES attributes:nil error:nil];

    }

    [httpServer setDocumentRoot:webPath];

    

    [self startServer];

    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];

    // Override point for customization after application launch.

    self.window.backgroundColor = [UIColor whiteColor];

    UINavigationController *nav = [[UINavigationController alloc]initWithRootViewController:[ViewController alloc]];

    self.window.rootViewController = nav;

    

    [self.window makeKeyAndVisible];

    return YES;

}