Swift 3 - How to load images into an IOS app

Question

Created Nov ’16

Replies 9

Boosts 0

Views 3.5k

Participants 2

Hi there!

I'm trying to create an app that are capable to take an image with the camera, load into the UIImageView. And when I restart the application, I want the photo to be loaded into the UIImageView, and how could I do that?

To take photo

@IBOutlet weak var p2Image: UIImageView!

    @IBAction func p2takePhoto(_ sender: Any) {
     
        let image = UIImagePickerController()
        image.delegate = self
        image.sourceType = UIImagePickerControllerSourceType.camera
        image.allowsEditing = false
        self.present(image, animated : true){}
      
    }

After taking the photo, I display the photo with UIImageView and save the photo's path

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
      
        if let image = info[UIImagePickerControllerOriginalImage] as? UIImage
        {
            p2Image.image = image
            UserDefaults.standard.set(p2Image.image?.accessibilityPath, forKey: "p2ImagePath")
        }
        else
        {
           
        }
        self.dismiss(animated: true, completion: nil)
        }

Codes to display my photo everytime I open the application

override func viewDidAppear(_ animated: Bool) {
        if let x = UserDefaults.standard.object(forKey: "p2ImagePath") as? String
        {
            p2Image.image = x
        }

But it din't work, can't even build, it says p2Image.image = x ( Cannot assign value of type string to type uiimage)

Am I missing something? Or am I using the wrong method?? Please help me..

Boost

Answer 1

Claude31 OP

Nov ’16

That's logical, a string is not an image.

you should try something like p2image.image = UIImage(x)

0

Answer 2

johnkx OP

Nov ’16

Hi there, thanks for replying! I tried p2Image.image = UIImage(x), but it still shows me error message, this time is Swift Compiler Error: Argument labels '(_:)' do not match any available overloads. Any idea..?

0

Answer 3

Claude31 OP

Nov ’16

UIImage(x) is just the pattern.

The exact call is UIImage(named: x) or UIImage(contentsOfFile: x)

0

Answer 4

johnkx OP

Nov ’16

I had tried both the method, both also no error, but it doesn't do the trick, is it because I'm using simulator? Since I'm using

UserDefaults.standard.set(p2Image.image?.accessibilityPath, forKey: "p2ImagePath"

I think is the best to use UIImage(contentsOfFile: x), right? By the way, .accessibilityPath is actually pointing at the image file's path, right? Or would it be better if i use document library??

Sorry for asking you this much question, I'm quite new to xcode..

0

Answer 5

Claude31 OP

Nov ’16

Yes, you have to use I think is the best to use UIImage(contentsOfFile: x)

In the simulator you have access only to a small gallery of predefined images.

Can you try on an actual device ?

0

Answer 6

johnkx OP

Nov ’16

Yes, I had tried on an Iphone 5, it doesn't work, no error message, I do not know whats the problem..

0

Answer 7

Claude31 OP

Nov ’16

Could you add a print statement:

- after

  UserDefaults.standard.set(p2Image.image?.accessibilityPath, forKey: "p2ImagePath") 
  Swift.print(p2Image.image?.accessibilityPath)

- and after

  p2Image.image = UIImage(contentsOfFile: x)
  Swift.print(x)

and tell what you get (on simulator)

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Answer 8

johnkx OP

Nov ’16

objc[1359]: Class PLBuildVersion is implemented in both 
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk/
System/Library/PrivateFrameworks/AssetsLibraryServices.framework/AssetsLibraryServices (0x12aec9998) and 
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk
/System/Library/PrivateFrameworks/PhotoLibraryServices.framework/PhotoLibraryServices (0x129dc3d38). 
One of the two will be used. Which one is undefined.
2016-11-26 00:45:15.039905 myproject[1359:38345] 
[Generic] Creating an image format with an unknown type is an error
nil

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Answer 9

johnkx OP

Nov ’16

I had solved with

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
       
        if let image = info[UIImagePickerControllerOriginalImage] as? UIImage
        {
            p2Image.image = image
            let saveImage = p2Image.image
            let imageData:NSData = UIImagePNGRepresentation(saveImage!)! as NSData
           
            UserDefaults.standard.set(imageData, forKey: "keyp2Image")
        }
        else
        {
            /
        }
        self.dismiss(animated: true, completion: nil)
    }
   
   
    override func viewWillAppear(_ animated: Bool) {
       
       
        if UserDefaults.standard.object(forKey: "keyp2Image") != nil
        {
        let data = UserDefaults.standard.object(forKey: "keyp2Image") as! NSData
        p2Image.image = UIImage(data: data as Data)
        }
    }

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