Objective c - ios：如何从相机胶卷中挑选视频

在iOS应用开发中，有时候我们需要从相机胶卷中选择视频。这可以用于让用户从他们的相册中选择一个视频文件，然后在应用中进行处理或展示。本文将介绍如何使用Objective-C语言来实现这一功能。

objective-c
#import 

objective-c
UIImagePickerController *picker = [[UIImagePickerController alloc] init];
picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
picker.mediaTypes = [[NSArray alloc] initWithObjects:(NSString *)kUTTypeMovie, nil];

objective-c
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
    NSURL *videoURL = [info objectForKey:UIImagePickerControllerMediaURL];
    // 在这里处理选择的视频
    [picker dismissViewControllerAnimated:YES completion:nil];
}

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

objective-c
#import 
#import 
@interface ViewController : UIViewController 
@end
@implementation ViewController
- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
}
- (IBAction)selectVideoButtonTapped:(id)sender {
    UIImagePickerController *picker = [[UIImagePickerController alloc] init];
    picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
    picker.mediaTypes = [[NSArray alloc] initWithObjects:(NSString *)kUTTypeMovie, nil];
    picker.delegate = self;
    [self presentViewController:picker animated:YES completion:nil];
}
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
    NSURL *videoURL = [info objectForKey:UIImagePickerControllerMediaURL];
    // 在这里处理选择的视频
    [picker dismissViewControllerAnimated:YES completion:nil];
}
- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker {
    [picker dismissViewControllerAnimated:YES completion:nil];
}
@end