Photos框架获取本地图片视频信息

image image

1.PHAsset获取本地图片的信息：名称，大小

// 名称
PHAsset* asset;
NSString *fileName = @"";
if (asset) {
    fileName = [asset valueForKey:@"filename"];
}

// 大小
UIImage* image；
NSData* data = UIImageJPEGRepresentation(image, 1);
NSInteger size = [data length];

2.对于拍照 获取本地图片的信息：名称，大小

#pragma mark - UIImagePickerControllerDelegate

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
    
    NSLog(@"%@", info);
    [picker dismissViewControllerAnimated:YES completion:nil];
    
    // info中就包含了选择的图片
    UIImage *image = info[UIImagePickerControllerOriginalImage];
    self.avatarImageView.image = image;
   
   // 先保存到相册 然后获取 PHAsset
  // saveImageToPhotoLibrary - 已经写YMImage分类
    self.asset = [image saveImageToPhotoLibrary][0];
}

YMImage分类

/**
 保存图片到本地，并读取本地图片信息
 
 相当于 - (PHFetchResult<PHAsset *> *)saveImageToPhotoLibrary
 */
- (void)saveImageToPhotoLibraryFinish:(void(^)(PHAsset *asset))finish {
    NSMutableArray *imageIds = [NSMutableArray array];
    [[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{
        //写入图片到相册
        PHAssetChangeRequest *req = [PHAssetChangeRequest creationRequestForAssetFromImage:self];
        //记录本地标识，等待完成后取到相册中的图片对象
        [imageIds addObject:req.placeholderForCreatedAsset.localIdentifier];
    } completionHandler:^(BOOL success, NSError * _Nullable error) {
        if (success) {
            //成功后取相册中的图片对象
            PHFetchResult *result = [PHAsset fetchAssetsWithLocalIdentifiers:imageIds options:nil];
            if (finish) finish([result firstObject]);
        }
    }];
}

/**
 获得刚才添加到【相机胶卷】中的图片 
 
 相当于 - (void)saveImageToPhotoLibraryFinish:(void(^)(PHAsset *asset))finish
 */
- (PHFetchResult<PHAsset *> *)saveImageToPhotoLibrary {
    __block NSString *createdAssetId = nil;
    // 添加图片到【相机胶卷】
    [[PHPhotoLibrary sharedPhotoLibrary] performChangesAndWait:^{
        createdAssetId = [PHAssetChangeRequest creationRequestForAssetFromImage:self].placeholderForCreatedAsset.localIdentifier;
    } error:nil];
    if (createdAssetId == nil) return nil;
    // 在保存完毕后取出图片
    return [PHAsset fetchAssetsWithLocalIdentifiers:@[createdAssetId] options:nil];
}

3.选择视频

#import <MobileCoreServices/MobileCoreServices.h>

[self openImagePickerController:UIImagePickerControllerSourceTypePhotoLibrary];

- (void)openImagePickerController:(UIImagePickerControllerSourceType)type
{
    if (![UIImagePickerController isSourceTypeAvailable:type]) return;
    
    UIImagePickerController *ipc = [[UIImagePickerController alloc] init];
    ipc.sourceType = type;
    ipc.mediaTypes = [NSArray arrayWithObject:(__bridge NSString*)kUTTypeMovie];
    ipc.delegate = self;
    [self presentViewController:ipc animated:YES completion:nil];
}

#pragma mark - UIImagePickerControllerDelegate

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
    
    NSLog(@"%@", info);
    
    NSString *mediaType = [info objectForKey:UIImagePickerControllerMediaType];
    if ([mediaType isEqualToString:(__bridge NSString*)kUTTypeMovie]){
        
        if (@available(iOS 11.0, *)) {
            PHAsset *asset = info[UIImagePickerControllerPHAsset];
            NSString *fileName = @"";
            if (asset) {
                fileName = [asset valueForKey:@"filename"];
                NSLog(@"%@", fileName);
            }
        } else {
            PHFetchResult *result = [PHAsset fetchAssetsWithMediaType:PHAssetMediaTypeVideo options:nil];
            [result enumerateObjectsUsingBlock:^(id  _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
                NSString *fileName = [obj valueForKey:@"filename"];
                if (fileName.length) {
                    *stop = YES;
                }
                NSLog(@"%@", fileName);
            }];
            
        }
    }
    [picker dismissViewControllerAnimated:YES completion:nil];
}