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iOS

Posted by Benjamin Pena
Benjamin Pena
2,835 Points

Could not cast value of type UIView to UIImageView

When building a playlist App for iOS, I get the above error in this code. 

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    if segue.identifier == "showPlaylistDetailSegue" {

        let playlistImageView = sender!.view as! UIImageView

        if let index = find(playlistsArray, playlistImageView) {
            let playlistDetailController = segue.destinationViewController as! PlaylistDetailViewController
            playlistDetailController.playlist = Playlist(index: 0)
        }

    }

6 Answers

agreatdaytocode
agreatdaytocode
24,757 Points
agreatdaytocode
agreatdaytocode
24,757 Points

Hi,

You have "as!" instead of "as"

// let playlistImageView = sender!.view as UIImageView

Try this:

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    if segue.identifier == "showPlaylistDetailSegue" {

        let playlistImageView = sender!.view as UIImageView

        if let index = find(playlistsArray, playlistImageView) {
            let playlistDetailController = segue.destinationViewController as! PlaylistDetailViewController
            playlistDetailController.playlist = Playlist(index: index)
        }

    }
Benjamin Pena
Benjamin Pena
2,835 Points

When I try that I get a error saying that "UIView is not convertible to UIImageView must use as! to force downcast"

agreatdaytocode
agreatdaytocode
24,757 Points

You also have "(index: 0)" I have

playlistDetailController.playlist = Playlist(index: index)

Benjamin Pena
Benjamin Pena
2,835 Points

I switched it back to (index:index) but I'm still getting the error saying I must use as!

agreatdaytocode
agreatdaytocode
24,757 Points

What xCode Version are you running?

Benjamin Pena
Benjamin Pena
2,835 Points

6.3

agreatdaytocode
agreatdaytocode
24,757 Points

I'm running Version 6.2 (6C131e) maybe that's the reason?

Benjamin Pena
Benjamin Pena
2,835 Points

Probably. Is there another way I could cast my sender image as a UIImageView?

Matt Barth
Matt Barth
5,060 Points
Matt Barth
Matt Barth
5,060 Points

You might have forgotten to link your gesture recognizers to the showplaylistdetail IBaction segue function. Make sure they are all linked.

Ryan Nelson
Ryan Nelson
2,369 Points
Ryan Nelson
Ryan Nelson
2,369 Points

I'm running Xcode version 6.4 and getting the same error. Is there a solution?

Jordan Buonforte
Jordan Buonforte
6,013 Points
Jordan Buonforte
Jordan Buonforte
6,013 Points

was there ever a solution to this question? i am having the same problem

missingn
missingn
3,479 Points
missingn
missingn
3,479 Points

I am also getting this error with Xcode 7.1.1 and Swift 2.0. A solution or workaround would be appreciated.

Mathieu Gosselin
Mathieu Gosselin
3,288 Points
Mathieu Gosselin
Mathieu Gosselin
3,288 Points

Had the same issue. In the main storyboard, the tap gesture Recognizer Outlet collection was tied to the parent view of the UIImageView.

  1. Right + control click on view item in storyboard
  2. click the X to remove the outlet collection link
  3. control + click drag from Playlist Image View 0 to Tap Gesture Recognizer
  4. That's it!