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?
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.
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.
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
}
So this is commentary on ("refinement tips") to your auto-answer. SO comments don't cut it for code samples, so here we go.
You can replace your for-index loop with a simpler for-each loop. E.g. something like:
for asset in PHAsset.fetchAssetsWithOptions(nil)
As of the last time I checked, the key in
info["PHImageFileURLKey"]
is undocumented. Be apprised. I don't think it will get you rejected, but the behavior could change at any time.
来源:https://stackoverflow.com/questions/28661938/retrieve-alasset-or-phasset-from-file-url