iOS模拟器中导入视频，获取相册视频，视频缩略图

本文介绍了在iOS应用开发中如何将工程中的视频导入到模拟器中，使用UIImagePickerController选取相册视频，并通过ALAssetsLibrary获取视频数据。此外，还提供了一个方法用于生成视频的预览图像。通过这些步骤，开发者可以在模拟器中方便地处理和展示视频资源。

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在开发用到视频时，模拟器中往往没有视频可用，下面的方法可以把工程中得视频导入到模拟器中

- (void)saveAction
{
    NSMutableArray *videoArray = [NSMutableArray arrayWithCapacity:3];
    
    NSArray *movs = [[NSBundle mainBundle] pathsForResourcesOfType:@"mov" inDirectory:nil];
    [videoArray addObjectsFromArray:movs];
    
    // save video to camera roll
    for (id item in videoArray) {
        if (UIVideoAtPathIsCompatibleWithSavedPhotosAlbum(item)) {
            
            // Note：save to camera roll is async, so the later item may copy complete than previous item
            UISaveVideoAtPathToSavedPhotosAlbum(item, self, nil, NULL);
        }
    }
}

获取相册中得视频

#import <AssetsLibrary/AssetsLibrary.h>

- (void)addMovie

{

UIImagePickerController *moviePicker = [[UIImagePickerController alloc] init];

moviePicker.delegate = self;

moviePicker.modalTransitionStyle = UIModalTransitionStyleCoverVertical;

moviePicker.allowsEditing = YES;

moviePicker.mediaTypes = [[NSArray alloc] initWithObjects:(NSString *)kUTTypeMovie, nil];

if (![UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {

moviePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;

} else {

moviePicker.sourceType = UIImagePickerControllerSourceTypeCamera;

}

[self presentViewController:moviePicker animated:YES completion:NULL];

}

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

{

//获取图片的NSURL 来源于AssetsLibrary.framework #import <AssetsLibrary/AssetsLibrary.h>

NSURL *url = [info objectForKey:UIImagePickerControllerReferenceURL];

//ALAssetsLibrary 获取图片和视频

ALAssetsLibrary *assetLibrary = [[ALAssetsLibrary alloc]init];

dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{

if (url) {

// 主要方法

[assetLibrary assetForURL:url resultBlock:^(ALAsset *asset) {

ALAssetRepresentation *rep = [asset defaultRepresentation];

Byte *buffer = (Byte*)malloc((unsigned long)rep.size);

NSUInteger buffered = [rep getBytes:buffer fromOffset:0.0 length:((unsigned long)rep.size) error:nil];

NSData *data = [NSData dataWithBytesNoCopy:buffer length:buffered freeWhenDone:YES];

NSString * videoPath = @"沙盒地址";

[data writeToFile:videoPath atomically:YES];

} failureBlock:nil];

}

});

[picker dismissViewControllerAnimated:YES completion:NULL];

}

获取视频缩略图

+ (UIImage *)getVideoPreViewImage:(NSURL *)videoPath

{

AVURLAsset *asset = [[AVURLAsset alloc] initWithURL:videoPath options:nil];

AVAssetImageGenerator *gen = [[AVAssetImageGenerator alloc] initWithAsset:asset];

gen.appliesPreferredTrackTransform = YES;

CMTime time = CMTimeMakeWithSeconds(0.0, 10);

NSError *error = nil;

CMTime actualTime;

CGImageRef image = [gen copyCGImageAtTime:time actualTime:&actualTime error:&error];

UIImage *img = [[UIImage alloc] initWithCGImage:image];

CGImageRelease(image);

return img;

}