[x-Code7新功能之三]PHPhotoLibrary的练习

系统管理员 2022-07-30 14:58 165阅读 0赞

#pragma mark - 相册的代理
    -(void)photoLibraryDidChange:(PHChange *)changeInstance
    {
        dispatch_async(dispatch_get_main_queue(), ^{
            PHObjectChangeDetails* isChange = [changeInstance changeDetailsForObject:_SelectCollection];
            if (isChange) {
                _AllAssets = [PHAsset fetchAssetsInAssetCollection:_SelectCollection options:nil];
                [self.collectionView reloadData];
            }
        });
    }
    
    #pragma mark - 拍照处理
    -(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info
    {
        NSString* mediaType = [info objectForKey:UIImagePickerControllerMediaType];
        //判断是静态图像还是视频
        if ([mediaType isEqualToString:(NSString *)kUTTypeImage]) {
            //相册是否支持添加图片
            if ([_SelectCollection canPerformEditOperation:PHCollectionEditOperationAddContent]) {
                [[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{
                    //获取用户编辑之后的图像
                    UIImage* editedImage = [info objectForKey:UIImagePickerControllerEditedImage];
                    PHAssetChangeRequest* request = [PHAssetChangeRequest creationRequestForAssetFromImage:editedImage];
                    PHAssetCollectionChangeRequest *CollentionRequest = [PHAssetCollectionChangeRequest changeRequestForAssetCollection:_SelectCollection];
                    PHObjectPlaceholder* holder = [request placeholderForCreatedAsset];
                    [CollentionRequest addAssets:@[holder]];
                } completionHandler:^(BOOL success, NSError * _Nullable error) {
    
                }];
            }
        }
        [picker dismissViewControllerAnimated:YES completion:nil];
    }

调用照相机

-(void)CameraAction
    {
        [MyPublicFuntions AlertCameraActions:self FromLocalHandler:^(UIAlertAction * _Nullable Action) {
            [MyPublicFuntions AlertOkOnly:self Message:@"功能未开通，敬请期待！～" OkHandler:nil Completion:nil];
        } FromCameraHandler:^(UIAlertAction * _Nullable Action) {
            if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
                UIImagePickerController* Picker = [[UIImagePickerController alloc] init];
                Picker.modalPresentationStyle = UIModalPresentationOverCurrentContext;
                Picker.delegate = self;
                Picker.allowsEditing = YES;
                Picker.sourceType = UIImagePickerControllerSourceTypeCamera;
                [self presentViewController:Picker animated:YES completion:nil];
            }
        } CancelHandler:nil Completion:nil];
    
    }

获取相册

-(void)GetUpAlbum
    {
        NSString* AlbumName = [[NSUserDefaults standardUserDefaults] valueForKey:CNAlbumName];
        PHFetchResult<PHCollection*>* AllAlbums = [PHCollection fetchTopLevelUserCollectionsWithOptions:nil];
        [AllAlbums enumerateObjectsUsingBlock:^(PHCollection * _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
            if ([obj.localizedTitle isEqualToString:AlbumName] && [obj isMemberOfClass:[PHAssetCollection class]]) {
                _SelectCollection = (PHAssetCollection*) obj;
                _AllAssets = [PHAsset fetchAssetsInAssetCollection:_SelectCollection options:nil];
            }
        }];
    }

这个是“图片上传小助手”里面的代码，凑活看吧～

总结：

1，所有对于相册的更新都应该在［phphotolibrary sharedPhotoLibrary ］perform changes里面写，否则错误。

2，更新通知则要实现PHPhotoLibraryChangeObserver协议，在performChange里面的CompletionHandler里面写不好使。

3，系统的相册目前没有找到能修改的方法，报错code＝－1.知道的可以留言哈～

参考：http://www.jianshu.com/p/42e5d2f75452