Objective c - ios：如何从Camera Roll中选择视频？

Question

我试试这个：

 UIImagePickerController *videoPicker = [[UIImagePickerController alloc] init];
videoPicker.delegate = self;
videoPicker.modalPresentationStyle = UIModalPresentationCurrentContext;
videoPicker.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;
videoPicker.mediaTypes = @[(NSString*)kUTTypeMovie, (NSString*)kUTTypeAVIMovie, (NSString*)kUTTypeVideo, (NSString*)kUTTypeMPEG4];
videoPicker.videoQuality = UIImagePickerControllerQualityTypeHigh;
[self presentViewController:videoPicker animated:YES completion:nil];

但它只显示照片中的视频，而不是所有视频中的视频。 我想从相机胶卷中选择所有视频。 请通过提供一些线索或代码来帮助我。 提前致谢！

Answer 1

以下是对上述答案的汇编和清理以及更多细节。

（0）确保你有这两个包含。

#import <UIKit/UIKit.h>
#import <MobileCoreServices/MobileCoreServices.h> // needed for video types

（1）在你的.h文件中添加两个代理：UINavigationControllerDelegate和UIImagePickerControllerDelegate。 对我们来说，它看起来像这样：

@interface ATHViewController () <UITabBarDelegate, UINavigationControllerDelegate,UIImagePickerControllerDelegate>

（2）向用户呈现其库中的视频选择。 将此代码添加到某处的.m文件中。

    // Present videos from which to choose
    UIImagePickerController *videoPicker = [[UIImagePickerController alloc] init];
    videoPicker.delegate = self; // ensure you set the delegate so when a video is chosen the right method can be called

    videoPicker.modalPresentationStyle = UIModalPresentationCurrentContext;
    // This code ensures only videos are shown to the end user
    videoPicker.mediaTypes = @[(NSString*)kUTTypeMovie, (NSString*)kUTTypeAVIMovie, (NSString*)kUTTypeVideo, (NSString*)kUTTypeMPEG4];

    videoPicker.videoQuality = UIImagePickerControllerQualityTypeHigh;
    [self presentViewController:videoPicker animated:YES completion:nil];

（3）处理选择器的响应。 将此代码添加到您的委托类。

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {

    // This is the NSURL of the video object
    NSURL *videoURL = [info objectForKey:UIImagePickerControllerMediaURL];

    NSLog(@"VideoURL = %@", videoURL);
    [picker dismissViewControllerAnimated:YES completion:NULL];
}

（4）当用户取消选择任何东西时处理。

- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker {
    [picker dismissViewControllerAnimated:YES completion:NULL];
}

Answer 2

请使用以下代码从iOS库中选择视频

UIImagePickerController *videoPicker = [[UIImagePickerController alloc] init];
videoPicker.delegate = self;
videoPicker.modalPresentationStyle = UIModalPresentationCurrentContext;
videoPicker.mediaTypes =[UIImagePickerController availableMediaTypesForSourceType:UIImagePickerControllerSourceTypePhotoLibrary];‌​
videoPicker.mediaTypes = @[(NSString*)kUTTypeMovie, (NSString*)kUTTypeAVIMovie, (NSString*)kUTTypeVideo, (NSString*)kUTTypeMPEG4];
videoPicker.videoQuality = UIImagePickerControllerQualityTypeHigh;
[self presentViewController:videoPicker animated:YES completion:nil];

请查看此链接从图库中选择视频