5

我正在尝试将 UIImage 保存到相机胶卷。AppleUIImageWriteToSavedPhotosAlbum已弃用,因此我避免使用它(同样适用于ALAssets),它强制使用PhotoLibrary.

这是我正在使用的代码:

定义:

var rollCollection : PHAssetCollection!;

初始化:

let result = PHAssetCollection.fetchAssetCollectionsWithType(.SmartAlbum, subtype: .SmartAlbumUserLibrary, options: nil);
rollCollection = result.firstObject as? PHAssetCollection;

保存图片的代码:

    if (rollCollection != nil){
        PHPhotoLibrary.sharedPhotoLibrary().performChanges({
            let assetRequest = PHAssetChangeRequest.creationRequestForAssetFromImage(
                self.originalImg!);

            let albumChangeRequest = PHAssetCollectionChangeRequest(forAssetCollection: self.rollCollection!);
            let assetPlaceHolder = assetRequest.placeholderForCreatedAsset;
            albumChangeRequest!.addAssets([assetPlaceHolder!])

            }, completionHandler: { success, error in
                dispatch_async(dispatch_get_main_queue(), {
                    print ("\(error!)");
                    if (!success){
                        self.presentViewController(self.alertCantSave!, animated: false, completion: nil);
                    }
                    else {
                        self.presentViewController(self.alertSaved!, animated: false, completion: nil);
                    }
                });

        })
    }
    else {
        dispatch_async(dispatch_get_main_queue(), {
        self.presentViewController(self.alertCantSave!, animated: false, completion: nil);
        });
    }

每次我尝试保存图像时,都会出现以下错误:

Error Domain=NSCocoaErrorDomain Code=-1 "(null)"

有任何想法吗?我找不到任何解释,在我寻找的所有地方,我都发现了一个类似于我的代码片段(包括 Apple 的文档:https ://developer.apple.com/library/ios/documentation/Photos/Reference/PHPhotoLibrary_Class/ )

谢谢。

4

1 回答 1

4

在寻找完全相同的东西几个小时后,我才发现了这个问题。

玩了一下,我能够想出一个对我有用的答案,所以我在这里分享它,以防万一其他人在未来寻找类似的东西。

// Make sure the image is not nil
guard let image = image else {
  // No image here...
  return
}

// Perform changes to the library 
PHPhotoLibrary.sharedPhotoLibrary().performChanges({
  // You only need to create the request, there is no need to define the placeholder 
  // nor to add the asset because swift does not like it when you try to modify the camera roll.
  PHAssetChangeRequest.creationRequestForAssetFromImage(image)

}, completionHandler: { success, error in
  // Same as what you have...

})

如果您想了解如何将图像保存到自定义相册以及从自定义相册查询图像的示例,请查看此答案。使用 PHImageManager 保存图像

于 2016-08-26T12:12:44.240 回答