Swift UIPasteboard not copying PNG

Question

My problem is really odd. In the simulator the .png copies to clipboard fine and I can paste the image in the Contacts app on Simulator. But when I put the app on the phone,

Answer 1

I believe you can use this line to do what you want (not able to test it out right now):

let image = UIImage(named: "myimage.png")
UIPasteboard.generalPasteboard().image = image;

Hopefully that works, I'm a little rusty with UIPasteboard.

Answer 2

There are lots of bugs and issues with the UIPasteboard class, so I'm really not surprised that you're having issues with something that so obviously is supposed to work. The documentation isn't that helpful either, to be honest. But try this; this worked for me on a physical device, and it's different to the above methods that are supposed to work but evidently don't for a bunch of people.

guard let imagePath = NSBundle.mainBundle().pathForResource("OliviaWilde", ofType: "jpg") else
{ return }

guard let imageData = NSData(contentsOfFile: imagePath) else { return }

let pasteboard = UIPasteboard.generalPasteboard()

pasteboard.setData(imageData, forPasteboardType: "public.jpeg")

You can use either "public.jpeg" or "public.png" if the source file is .jpg; it still works. I think it only changes the format of the thing that gets pasted?

Also, did you try adding the file extension in your first line of code where you create the UIImage? That might make it work too.

Evidently use of this class is temperamental, not just in this use case. So even though we're doing same thing, only difference in this code is we're creating the NSData from a path rather than a UIImage. Lol let me know if that works for you.

Answer 3

Make sure the code runs fine in your host app (not a keyboard extension app). For example, check if the read image has the same resolution:

    //the Pasteboard is nil if full access is not granted
    let pbWrapped: UIPasteboard? = UIPasteboard.generalPasteboard()
    if let pb = pbWrapped {
        var type = UIPasteboardTypeListImage[0] as! String
        if (count(type) > 0) && (image != nil) {
            pb.setData(UIImagePNGRepresentation(image), forPasteboardType: type)
            var readDataWrapped: NSData? = pb.dataForPasteboardType(type)
            if let readData = readDataWrapped {
                var readImage = UIImage(data: readData, scale: 2)
                println("\(image) == \(pb.image) == \(readImage)")
            }
        }
    }

If the pasteboard object is nil in your keyboard app that means you haven't provided full access to the keyboard: Copying and pasting image into a textbook in simulator

Answer 4

Ensure that RequestsOpenAccess is set to YES under NSExtension > NSExtensionAttributes in the extension's info.plist