从文件URL中检索ALAsset或PHAsset [英] Retrieve ALAsset or PHAsset from file URL

问题描述

选择Photos.app中的图像传递给动作扩展名似乎会产生磁盘上图像的路径（例如： file：///var/mobile/Media/DCIM/109APPLE/IMG_9417.JPG ）。有没有办法获得相应的ALAsset或PHAsset？

Selecting images in Photos.app to pass to an action extension seems to yield paths to images on disk (e.g.: file:///var/mobile/Media/DCIM/109APPLE/IMG_9417.JPG). Is there a way to get the corresponding ALAsset or PHAsset?

URL看起来与调用 PHImageManager得到的 PHImageFileURLKey 条目相对应。 requestImageDataForAsset 。我不想迭代所有的PHAssets来找到它。

The URL looks like it corresponds to the PHImageFileURLKey entry you get from calling PHImageManager.requestImageDataForAsset. I'd hate to have to iterate through all PHAssets to find it.

推荐答案

我做了我不想做的事情并将这种愚蠢的搜索方法放在一起。虽然它很糟糕，但很慢并且当照片库很大时会给我带来记忆问题。

I did what I didn't want to do and threw this dumb search approach together. It works, although it's horrible, slow and gives me memory issues when the photo library is large.

作为Cocoa和Swift的菜鸟，我很欣赏细化技巧。谢谢！

As a noob to both Cocoa and Swift I'd appreciate refinement tips. Thanks!

func PHAssetForFileURL(url: NSURL) -> PHAsset? {
    var imageRequestOptions = PHImageRequestOptions()
    imageRequestOptions.version = .Current
    imageRequestOptions.deliveryMode = .FastFormat
    imageRequestOptions.resizeMode = .Fast
    imageRequestOptions.synchronous = true

    let fetchResult = PHAsset.fetchAssetsWithOptions(nil)
    for var index = 0; index < fetchResult.count; index++ {
        if let asset = fetchResult[index] as? PHAsset {
            var found = false
            PHImageManager.defaultManager().requestImageDataForAsset(asset,
                options: imageRequestOptions) { (_, _, _, info) in
                    if let urlkey = info["PHImageFileURLKey"] as? NSURL {
                        if urlkey.absoluteString! == url.absoluteString! {
                            found = true
                        }
                    }
            }
            if (found) {
                return asset
            }
        }
    }

    return nil
}

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