无法在 UIImagePickerController didFinishPickingMediaWithInfo 中获取开始和结束编辑时间：

Question

我使用 UIImagePickerController 来剪辑视频，我这样创建它：

UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];
imagePicker.delegate = self;
[imagePicker setVideoQuality:UIImagePickerControllerQualityType640x480];
imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
imagePicker.mediaTypes = @[(__bridge NSString *)kUTTypeMovie, (__bridge NSString *)kUTTypeVideo, (__bridge NSString *)kUTTypeMPEG4];
imagePicker.allowsEditing = YES;
[self.navigationController presentViewController:imagePicker animated:YES completion:nil];

但不幸的是，在调用的委托方法中，我无法获取开始和结束编辑时间 - 以保存编辑后的视频：

-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info {

    [picker dismissViewControllerAnimated:YES completion:^{

    }];

    NSString *type = [info objectForKey:UIImagePickerControllerMediaType];
    if ([type isEqualToString:(NSString *)kUTTypeVideo] ||
        [type isEqualToString:(NSString *)kUTTypeMovie]) { // movie != video
        NSURL *videoURL = [info objectForKey:UIImagePickerControllerMediaURL];


        NSNumber *start = [info objectForKey:@"_UIImagePickerControllerVideoEditingStart"];
        NSNumber *end = [info objectForKey:@"_UIImagePickerControllerVideoEditingEnd"];

}

在我的例子中，开始和结束是零。我不知道如何获得这些信息。你能告诉我如何得到它吗？预先感谢您的帮助。

Answer 1

我刚刚检查了你的代码运行我发现 _UIImagePickerControllerVideoEditingStart 和 _UIImagePickerControllerVideoEditingEnd return 只从相机捕获视频但是如果你是 select来自您 PhotoLibrary 的视频您没有在信息字典中获得这两个键：

如果您正在使用 imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary; 那么您将获得以下信息字典日志：

    UIImagePickerControllerMediaType = "public.movie";
    UIImagePickerControllerMediaURL = "file:///private/var/mobile/Containers/Data/Application/BCBE6A30-1A92-41BB-8734-BFF052E416DE/tmp/trim.59737F15-FC2A-4EB7-89AE-DF3831089657.MOV";
    UIImagePickerControllerReferenceURL = "assets-library://asset/asset.MOV?id=87E3E50A-1DBF-449F-8BE3-AB36E718D82C&ext=MOV";

如果您正在使用 imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera; 那么您将获得以下信息字典日志：

    UIImagePickerControllerMediaType = "public.movie";
    UIImagePickerControllerMediaURL = "file:///private/var/mobile/Containers/Data/Application/611D33A4-61F4-4CD0-934D-C0EFF82B75AC/tmp/capture/capturedvideo.MOV";
    "_UIImagePickerControllerVideoEditingEnd" = "2.360877976190476";
    "_UIImagePickerControllerVideoEditingStart" = "1.360505952380952";

所以最后 UIImagePickerControllerSourceTypePhotoLibrary UIImagePickerController 不会提供 _UIImagePickerControllerVideoEditingStart 和 _UIImagePickerControllerVideoEditingEnd 键。所以你可以通过使用 AVURLAsset 来获得它的持续时间，就像下面的代码假设开始时间是 0 并且结束时间是完整的持续时间。

AVURLAsset *Asset = [AVURLAsset assetWithURL:videoURL];
CMTime duration = [Asset duration];
int fullduration = ceil(duration.value/duration.timescale);

无法在 UIImagePickerController didFinishPickingMediaWithInfo 中获取开始和结束编辑时间：

Cant get start and end editing time in UIImagePickerController didFinishPickingMediaWithInfo:

uiimagepickercontroller

ios