iOS从相册选择视频和保存视频到相册

2017年08月03日 18:13:16 阅读数：3428

 

最近，在做有关视频操作的功能。需要从相册选择视频，处理之后再保存到相册。

选择视频：

方式一：用系统的UIImagePickerController

贴代码：

 

1.  
   - (void)selectAction{
2.  
    
3.  
   NSLog(@"从相册选择");
4.  
   UIImagePickerController *picker=[[UIImagePickerController alloc] init];
5.  
    
6.  
   picker.delegate=self;
7.  
   picker.allowsEditing=NO;
8.  
   picker.videoMaximumDuration = 1.0;//视频最长长度
9.  
   picker.videoQuality = UIImagePickerControllerQualityTypeMedium;//视频质量
10.  
     
11.  
    //媒体类型：@"public.movie" 为视频 @"public.image" 为图片
12.  
    //这里只选择展示视频
13.  
    picker.mediaTypes = [NSArray arrayWithObjects:@"public.movie", nil];
14.  
     
15.  
    picker.sourceType= UIImagePickerControllerSourceTypeSavedPhotosAlbum;
16.  
     
17.  
    [kCurNavController presentViewController:picker animated:YES completion:^{
18.  
     
19.  
    }];
20.  
     
21.  
    }
22.  
    #pragma mark UIImagePickerControllerDelegate
23.  
    - (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info{
24.  
     
25.  
    NSString *mediaType=[info objectForKey:UIImagePickerControllerMediaType];
26.  
     
27.  
    if ([mediaType isEqualToString:@"public.movie"]){
28.  
    //如果是视频
29.  
    NSURL *url = info[UIImagePickerControllerMediaURL];//获得视频的URL
30.  
    NSLog(@"url %@",url);
31.  
    self.videoUrl = url;
32.  
    }
33.  
     
34.  
    [self dismissViewControllerAnimated:YES completion:nil];
35.  
    }

选择视频:

方式二：利用三方库TZImagePickerController 

贴代码：

 

1.  
   - (void)selectThreeKuAction{
2.  
    
3.  
   TZImagePickerController *imagePickerVc = [[TZImagePickerController alloc] initWithMaxImagesCount:1 columnNumber:4 delegate:nil pushPhotoPickerVc:YES];
4.  
    
5.  
   //展示相册中的视频
6.  
   imagePickerVc.allowPickingVideo = YES;
7.  
   //不展示图片
8.  
   imagePickerVc.allowPickingImage = NO;
9.  
   //不显示原图选项
10.  
    imagePickerVc.allowPickingOriginalPhoto = NO;
11.  
    //按时间排序
12.  
    imagePickerVc.sortAscendingByModificationDate = YES;
13.  
     
14.  
    //选择完视频之后的回调
15.  
    [imagePickerVc setDidFinishPickingVideoHandle:^(UIImage *coverImage,id asset){
16.  
     
17.  
    //iOS8以后返回PHAsset
18.  
    PHAsset *phAsset = asset;
19.  
     
20.  
    if (phAsset.mediaType == PHAssetMediaTypeVideo) {
21.  
    //从PHAsset获取相册中视频的url
22.  
    PHVideoRequestOptions *options = [[PHVideoRequestOptions alloc] init];
23.  
    options.version = PHImageRequestOptionsVersionCurrent;
24.  
    options.deliveryMode = PHVideoRequestOptionsDeliveryModeAutomatic;
25.  
    PHImageManager *manager = [PHImageManager defaultManager];
26.  
    [manager requestAVAssetForVideo:phAsset options:options resultHandler:^(AVAsset * _Nullable asset, AVAudioMix * _Nullable audioMix, NSDictionary * _Nullable info) {
27.  
    AVURLAsset *urlAsset = (AVURLAsset *)asset;
28.  
     
29.  
    NSURL *url = urlAsset.URL;
30.  
    self.videoUrl = url;
31.  
    NSLog(@"%@",url);
32.  
    }];
33.  
    }
34.  
    }];
35.  
    [kCurNavController presentViewController:imagePickerVc animated:YES completion:nil];
36.  
    }

以上都得到了视频的URL，之后再操作就方便了。

 

裁剪视频：

 

1.  
   //视频裁剪
2.  
   - (void)cropWithVideoUrlStr:(NSURL *)videoUrl start:(CGFloat)startTime end:(CGFloat)endTime completion:(void (^)(NSURL *outputURL, Float64 videoDuration, BOOL isSuccess))completionHandle
3.  
   {
4.  
   AVURLAsset *asset =[[AVURLAsset alloc] initWithURL:videoUrl options:nil];
5.  
    
6.  
   //获取视频总时长
7.  
   Float64 duration = CMTimeGetSeconds(asset.duration);
8.  
    
9.  
   NSString *outputPath = [NSTemporaryDirectory() stringByAppendingPathComponent:@"dafei.mp4"];
10.  
    NSURL *outputURL = [NSURL fileURLWithPath:outputPath];
11.  
     
12.  
    //如果文件已经存在，先移除，否则会报无法存储的错误
13.  
    NSFileManager *manager = [NSFileManager defaultManager];
14.  
    [manager removeItemAtPath:outputPath error:nil];
15.  
     
16.  
    NSArray *compatiblePresets = [AVAssetExportSession exportPresetsCompatibleWithAsset:asset];
17.  
    if ([compatiblePresets containsObject:AVAssetExportPresetMediumQuality])
18.  
    {
19.  
     
20.  
    AVAssetExportSession *exportSession = [[AVAssetExportSession alloc]
21.  
    initWithAsset:asset presetName:AVAssetExportPresetPassthrough];
22.  
     
23.  
    exportSession.outputURL = outputURL;
24.  
    //视频文件的类型
25.  
    exportSession.outputFileType = AVFileTypeQuickTimeMovie;
26.  
    //输出文件是否网络优化
27.  
    exportSession.shouldOptimizeForNetworkUse = YES;
28.  
     
29.  
    //要截取的开始时间
30.  
    CMTime start = CMTimeMakeWithSeconds(startTime, asset.duration.timescale);
31.  
    //要截取的总时长
32.  
    CMTime duration = CMTimeMakeWithSeconds(endTime - startTime,asset.duration.timescale);
33.  
    CMTimeRange range = CMTimeRangeMake(start, duration);
34.  
    exportSession.timeRange = range;
35.  
     
36.  
    [exportSession exportAsynchronouslyWithCompletionHandler:^{
37.  
    switch ([exportSession status]) {
38.  
    case AVAssetExportSessionStatusFailed:
39.  
    {
40.  
    NSLog(@"合成失败：%@", [[exportSession error] description]);
41.  
    completionHandle(outputURL, endTime, NO);
42.  
    }
43.  
    break;
44.  
    case AVAssetExportSessionStatusCancelled:
45.  
    {
46.  
    completionHandle(outputURL, endTime, NO);
47.  
    }
48.  
    break;
49.  
    case AVAssetExportSessionStatusCompleted:
50.  
    {
51.  
    //成功
52.  
    completionHandle(outputURL, endTime, YES);
53.  
     
54.  
    }
55.  
    break;
56.  
    default:
57.  
    {
58.  
    completionHandle(outputURL, endTime, NO);
59.  
    } break;
60.  
    }
61.  
    }];
62.  
    }
63.  
    }

处理完视频之后，把视频保存到相册：

方式一：

 

1.  
   //保存视频到相册
2.  
   - (void)writeVideoToPhotoLibrary:(NSURL *)url
3.  
   {
4.  
   ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];
5.  
    
6.  
   [library writeVideoAtPathToSavedPhotosAlbum:url completionBlock:^(NSURL *assetURL, NSError *error){
7.  
   if (error == nil) {
8.  
    
9.  
   UIAlertController * alert = [UIAlertController alertControllerWithTitle:@"提示" message:@"视频保存成功" preferredStyle:UIAlertControllerStyleAlert];
10.  
     
11.  
    [alert addAction:[UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
12.  
     
13.  
    }]];
14.  
    [self presentViewController:alert animated:true completion:nil];
15.  
     
16.  
    }else{
17.  
    UIAlertController * alert = [UIAlertController alertControllerWithTitle:@"提示" message:@"视频保存失败" preferredStyle:UIAlertControllerStyleAlert];
18.  
     
19.  
    [alert addAction:[UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
20.  
     
21.  
    }]];
22.  
    [self presentViewController:alert animated:true completion:nil];
23.  
    }
24.  
    }];
25.  
    }

保存视频到相册，方式二：用下面这个方法

 

UISaveVideoAtPathToSavedPhotosAlbum(path, self, @selector(video:didFinishSavingWithError:contextInfo:), nil);

1.  
   // 视频保存回调
2.  
   - (void)video:(NSString *)videoPath didFinishSavingWithError:(NSError *)error contextInfo: (void *)contextInfo {
3.  
    
4.  
   if (error == nil) {
5.  
    
6.  
   UIAlertController * alert = [UIAlertController alertControllerWithTitle:@"提示" message:@"视频保存成功" preferredStyle:UIAlertControllerStyleAlert];
7.  
    
8.  
   [alert addAction:[UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
9.  
    
10.  
    }]];
11.  
    [self presentViewController:alert animated:true completion:nil];
12.  
     
13.  
    }else{
14.  
    UIAlertController * alert = [UIAlertController alertControllerWithTitle:@"提示" message:@"视频保存失败" preferredStyle:UIAlertControllerStyleAlert];
15.  
     
16.  
    [alert addAction:[UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
17.  
     
18.  
    }]];
19.  
    [self presentViewController:alert animated:true completion:nil];
20.  
    }
21.