I have been trying to figure out this for a few days now. I have done a ton of searching within google and stack but have not been able to find something that works or makes sense. I am new to Swift but have some programming background.
Currently this part of the app takes a picture, displays it on the current viewcontroller(VCPhoto), moves to another controller, displays an animation viewcontroller(VCQScan), then moves to a result viewcontroller(VCResult). I am trying to move the image from the VCPhoto to VCResult. One answer I found was this one
Passing Image to another View Controller (Swift)
This, in my code, returns a null value in the next viewcontroller.
VCPhoto {
@IBOutlet var butTakePhoto: UIButton!
@IBOutlet var butSkip: UIButton!
@IBOutlet var scanCatB: UIButton!
@IBOutlet var previewPhoto: UIImageView!
let picker = UIImagePickerController()
override func viewDidLoad() {
super.viewDidLoad()
butTakePhoto.addTarget(self, action: #selector(VCPhoto.buttonPressed(_:)), for: .touchUpInside)
butSkip.addTarget(self, action: #selector(VCPhoto.buttonPressed(_:)), for: .touchUpInside)
scanCatB.addTarget(self, action: #selector(VCPhoto.buttonPressed(_:)), for: .touchUpInside)
picker.delegate = self
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
public func buttonPressed (_ sender: AnyObject?){
if sender === butTakePhoto {
if UIImagePickerController.isSourceTypeAvailable(.camera) {
picker.allowsEditing = false
picker.sourceType = UIImagePickerControllerSourceType.camera
picker.cameraCaptureMode = .photo
picker.modalPresentationStyle = .fullScreen
present(picker,animated: true,completion: nil)
}
}
if sender === scanCatB {
performSegue(withIdentifier: "sSegue", sender: UIButton.self)
}
if sender === butSkip {
performSegue(withIdentifier: "Result", sender: nil)
}
}
func imagePickerController(
_ picker: UIImagePickerController,
didFinishPickingMediaWithInfo info: [String : Any])
{
picker.dismiss(animated: true, completion: nil)
let image = info[UIImagePickerControllerOriginalImage] as? UIImage
previewPhoto.image = image
//butScan.isHidden=false
//butSkip.isHidden=true
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "sSegue" {
let dvc = segue.destination as? VCQScan
dvc?.newImage = previewPhoto.image
}
VCScan {
@IBOutlet var catScanImage: UIImageView!
@IBOutlet weak var browsingImage: UIImageView!
var newImage: UIImage!
override func viewDidLoad() {
super.viewDidLoad()
browsingImage.image = newImage
Timer.scheduledTimer(timeInterval: 4.0, target: self, selector: #selector(catScan), userInfo: nil, repeats: false)
catScanImage.animationImages = [
UIImage(named: "catPerc0.png")!,
UIImage(named: "catPerc1.png")!,
UIImage(named: "catPerc2.png")!,
UIImage(named: "catPerc3.png")!,
UIImage(named: "catPerc4.png")!
]
catScanImage.animationDuration = 0.4
catScanImage.startAnimating()
// Do any additional setup after loading the view, typically from a nib.
}
func catScan() {
self.performSegue(withIdentifier: "lastSegue", sender: self)
}
func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "lastSegue" {
let dvc = segue.destination as! VCResult
dvc.newImage = browsingImage.image
}
}
}
The above prepare for segue is trying to move it to the next VC, but it does not get that far, it errors on
browsingImage.image = newImage
within VCQScan, it does not appear to be moving the image even though I can see it in the debugger on VCPhoto... Thanks for any help!!!! Hopefully this is enough info, if not let me know! Again, I am new to Swift and Xcode so there is a chance I am missing something really stupid...
Debugger output 2017-04-03 20:08:33.637110-0700 OatQuizApp[3314:1066322 [OatQuizApp.VCResult buttonPressed:]:unrecognized selector sent to instance 0x100b1fdb0 2017-04-03 20:08:33.638569-0700 OatQuizApp[3314:1066322] * Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[OatQuizApp.VCResult buttonPressed:]: unrecognized selector sent to instance 0x100b1fdb0' * First throw call stack: (0x18ca7efd8 0x18b4e0538 0x18ca85ef4 0x18ca82f4c 0x18c97ed2c 0x192be30ec 0x192be306c 0x192bcd5e0 0x192be2950 0x192be246c 0x192bdd804 0x192bae418 0x1933a7f64 0x1933a26c0 0x1933a2aec 0x18ca2d424 0x18ca2cd94 0x18ca2a9a0 0x18c95ad94 0x18e3c4074 0x192c13130 0x1000cf900 0x18b96959c) libc++abi.dylib: terminating with uncaught exception of type NSException
I figured out the issue.. Everything was coded correctly, at least originally. I was not paying attention regarding the UIImageView, I did not have one on VCQScan, just added an outlet, which is why it was coming up as null. I for some reason was thinking that the UIImageView was just carrying the image... I think I was staring at it too long. Thanks for looking!
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