Saving an image to special album swift - image

Question

I want to add a new photo to certain album, I'm trying to do it like that:
override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
albumName = "\(data.objectAtIndex(indexPath.row))"
let imagePickerController = UIImagePickerController()
imagePickerController.delegate = self
let actionSheet = UIAlertController(title: "Choose image source", message: nil, preferredStyle: UIAlertControllerStyle.ActionSheet)
actionSheet.addAction(UIAlertAction(title: "Take Photo", style: UIAlertActionStyle.Default, handler: { (alert:UIAlertAction!) -> Void in
imagePickerController.sourceType = UIImagePickerControllerSourceType.Camera
self.presentViewController(imagePickerController, animated: true, completion: {})
}))
actionSheet.addAction(UIAlertAction(title: "Camera Roll", style: UIAlertActionStyle.Default, handler: { (alert:UIAlertAction!) -> Void in
imagePickerController.sourceType = UIImagePickerControllerSourceType.PhotoLibrary
self.presentViewController(imagePickerController, animated: true, completion: nil)
}))
actionSheet.addAction(UIAlertAction(title: "Cancel", style: UIAlertActionStyle.Cancel, handler: nil))
self.presentViewController(actionSheet, animated: true, completion: nil)
}
func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [NSObject : AnyObject]) {
let image:UIImage = info[UIImagePickerControllerOriginalImage] as UIImage
var groupToAddTo: ALAssetsGroup = ALAssetsGroup()
self.library.enumerateGroupsWithTypes(ALAssetsGroupType(ALAssetsGroupAlbum),
usingBlock: {
(group: ALAssetsGroup!, stop: UnsafeMutablePointer<ObjCBool>) -> Void in
if group.valueForProperty(ALAssetsGroupPropertyName).isEqualToString(self.albumName){
groupToAddTo = group
}
},
failureBlock: {
(myerror: NSError!) -> Void in
println("error occurred: \(myerror.localizedDescription)")
})
var img: CGImageRef = image.CGImage
self.library.writeImageToSavedPhotosAlbum(img, metadata: nil, completionBlock: {
(assetUrl: NSURL!, error: NSError!) -> Void in
if error.code == 0 {
println("saved image completed: \(assetUrl)")
self.library.assetForURL(assetUrl, resultBlock: { (asset: ALAsset!) -> Void in
groupToAddTo.addAsset(asset)
return
}, failureBlock: {
(myerror: NSError!) -> Void in
println("error occurred: \(myerror.localizedDescription)")
})
} else {
println("saved image failed. \(error.localizedDescription) code \(error.code)")
}
} )
}
However, when I run this code, I get this error:
fatal error: unexpectedly found nil while unwrapping an Optional value
in this line:
if group.valueForProperty(ALAssetsGroupPropertyName).isEqualToString(self.albumName){
So, the question is that, how to save an image to certain album in swift?

Answer 1

I am betting albumName is an optional value.
You should put an if statement to judge if almbumName is nil. When it's nil, create a newalbum name on your iPhone.

Answer 2

First:
if group != nil {
if group.valueForProperty(ALAssetsGroupPropertyName).isEqualToString(self.albumNames[indexPath.row]){
groupToAddTo = group
}
}
Second, when error = nil your app will crash because of "if error.code == 0." Do "if error == nil" instead.