Heavy Heavy - 4 months ago 38
iOS Question

Getting metadata in swift by UIImagepickerController

I'm trying to implement the answer in iOS 8 UIImage Metadata for Objective-C in SWIFT as follows

//source: http://stackanswers.com/questions/24227578/ios-8-uiimage-metadata
func metaDataFromAssetLibrary(info: NSDictionary) {

var assetURL = info.objectForKey(UIImagePickerControllerReferenceURL) as NSURL
var assetLibrary = ALAssetsLibrary()
assetLibrary.assetForURL(assetURL as NSURL, resultBlock: {
(asset: ALAsset!) in
var metadata: NSDictionary = asset.defaultRepresentation().metadata() as NSDictionary
NSLog ("imageMetaData from AssetLibrary %@",metadata);

}, failureBlock: {
(error: NSError!) in

NSLog("Error!")
})

}


I'm calling it with

func imagePickerController(picker: UIImagePickerController!, didFinishPickingMediaWithInfo info: NSDictionary!){

// http://stackoverflow.com/questions/3088874/didfinishpickingmediawithinfo-return-nil-photo
picker.dismissViewControllerAnimated(true, completion: nil)

let image = info.objectForKey("UIImagePickerControllerOriginalImage") as UIImage

PHPhotoLibrary.sharedPhotoLibrary().performChanges({
let createAssetRequest = PHAssetChangeRequest.creationRequestForAssetFromImage(image)
let assetPlaceholder = createAssetRequest.placeholderForCreatedAsset
let albumChangeRequest = PHAssetCollectionChangeRequest(forAssetCollection: self.assetCollection, assets: self.photosAsset)

albumChangeRequest.addAssets([assetPlaceholder])
}, completionHandler: {(success, error)in
NSLog("Adding Image to Library -> %@", (success ? "Sucess":"Error!"))
picker.dismissViewControllerAnimated(true, completion: nil)
})
metaDataFromAssetLibrary(info)

}


which results in a "fatal error: unexpectedly found nil while unwrapping an Optional value"

Answer

Try this code:

let metadata = info[UIImagePickerControllerMediaMetadata] as? NSDictionary    
let image = info[UIImagePickerControllerOriginalImage] as? UIImage
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