iOS视频技术——编辑视频

编辑视频可以使用UIVideoEditorController类和他的委托协议UIVideoEditorControllerDelegate。

#import "ViewController.h"

@interface ViewController ()

<UIVideoEditorControllerDelegate,
UINavigationControllerDelegate>

- (IBAction)editButtonPress:(id)sender;
-(void)video:(NSString *)videoPath didFinishSavingWithError:(NSError *)error contextInfo:(NSString *)contextInfo;

@end

@implementation ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    
}

- (IBAction)editButtonPress:(id)sender
{
    NSBundle *bundle = [NSBundle mainBundle];
    NSString *moviePath = [bundle pathForResource:@"YY" ofType:@"mp4"];
    //判断设备是否支持编辑视频
    if ([UIVideoEditorController canEditVideoAtPath:moviePath])
    {
        UIVideoEditorController *videoEditor = [[UIVideoEditorController alloc] init];
        videoEditor.delegate = self;
        videoEditor.videoPath = moviePath;
        [self presentViewController:videoEditor animated:YES completion:NULL];
    }
    else
    {
        NSLog(@"不能编辑这个视频");
    }
}

-(void)video:(NSString *)videoPath didFinishSavingWithError:(NSError *)error contextInfo:(NSString *)contextInfo
{
    NSString *title;
    NSString *message;
    if (error == nil)
    {
        title = @"视频保存";
        message = @"视频已经保存到设备的相机胶卷中";
    }
    else
    {
        title = @"保存失败";
        message = [error description];
    }
    UIAlertController *alertC = [UIAlertController alertControllerWithTitle:title message:message preferredStyle:UIAlertControllerStyleAlert];
    UIAlertAction *alertA = [UIAlertAction actionWithTitle:@"OK" style:UIAlertActionStyleCancel handler:nil];
    [alertC addAction:alertA];
    [self presentViewController:alertC animated:YES completion:nil];
}

#pragma mark - UIViddeoEditorControllerDelegate协议方法
-(void)videoEditorController:(UIVideoEditorController *)editor
    didSaveEditedVideoToPath:(NSString *)editedVideoPath
{
    [editor dismissViewControllerAnimated:YES completion:NULL];
    if (UIVideoAtPathIsCompatibleWithSavedPhotosAlbum(editedVideoPath))
    {
        UISaveVideoAtPathToSavedPhotosAlbum(editedVideoPath, self, @selector(video:didFinishSavingWithError:contextInfo:), (__bridge void *)(editedVideoPath));
    }
}

-(void)videoEditorController:(UIVideoEditorController *)editor didFailWithError:(NSError *)error
{
    NSLog(@"编辑视频出错");
    NSLog(@"Video editor error occurred = %@", error);
    [editor dismissViewControllerAnimated:YES completion:NULL];
}

-(void)videoEditorControllerDidCancel:(UIVideoEditorController *)editor
{
    NSLog(@"视频编辑取消");
    [editor dismissViewControllerAnimated:YES completion:NULL];
}

@end