UIImageView - How to get the file name of the image assigned

Question

Is it possible to read the name of an UIImageView s UIImage that s presently stored in the UIImageView   I was hoping you could do something kind of like this  but haven t figured it out   NSString  currentImageName    MyIImageView getFileName

User · Answer

Neither UIImageView not UIImage holds on to the filename of the image loaded.

You can either

1: (as suggested by Kenny Winker above) subclass UIImageView to have a fileName property or

2: name the image files with numbers (image1.jpg, image2.jpg etc) and tag those images with the corresponding number (tag=1 for image1.jpg, tag=2 for image2.jpg etc) or

3: Have a class level variable (eg. NSString *currentFileName) which updates whenever you update the UIImageView's image

User · Answer

I have deal with this problem  I have been solved it by MVC design pattern  I created Card class    interface Card   NSObject   property  strong nonatomic  UIImage  img    property   strong nonatomic  NSString  url    end     then in the UIViewController in the DidLoad Method to Do       init Cards Card  card10    Card alloc init   card10 url   image jpg     card10 img    UIImage imageNamed  card10 url         for Example  UIImageView   myImageView     UIImageView alloc initWithImage card10 img    self view addSubview myImageView       may you want to check the image name   so you can do this     for example   NSString   str     image jpg     if  str isEqualToString   card10 url         your code here

User · Answer

Swift 3 First set the accessibilityIdentifier as imageName myImageView image  accessibilityIdentifier    quot add-image quot   Then Use the following code  extension UIImageView     func getFileName   - gt  String           First set accessibilityIdentifier of image before calling      let imgName   self image  accessibilityIdentifier     return imgName        Finally  The calling way of method to identify myImageView getFileName

User · Answer

Nope  No way to do that natively  You re going to have to subclass UIImageView  and add an imageFileName property  which you set when you set the image

User · Answer

Yes you can compare with the help of data like below code  UITableViewCell  cell    UITableViewCell   self view viewWithTag indexPath row   100    UIImage  secondImage    UIImage imageNamed   boxhover png     NSData  imgData1   UIImagePNGRepresentation cell imageView image   NSData  imgData2   UIImagePNGRepresentation secondImage    BOOL isCompare     imgData1 isEqual imgData2   if isCompare          contain same image     cell imageView image    UIImage imageNamed   box png      else         does not contain same image     cell imageView image   secondImage

User · Answer

you can use setAccessibilityIdentifier method for any subclass of UIView  UIImageView  image    image setAccessibilityIdentifier   file name      NSString  file name    image accessibilityIdentifier

User · Answer

Nope  You can t do that   The reason is that a UIImageView instance does not store an image file  It stores a displays a UIImage instance  When you make an image from a file  you do something like this   UIImage  picture    UIImage imageNamed   myFile png      Once this is done  there is no longer any reference to the filename  The UIImage instance contains the data  regardless of where it got it  Thus  the UIImageView couldn t possibly know the filename   Also  even if you could  you would never get filename info from a view  That breaks MVC

User · Answer

use below     UIImageView  imageView     UIImageView    barButtonItem customView subviews lastObject     file name   imageView accessibilityLabel

User · Answer

Get image name Swift 4 2  There is a way if you want to compare button image names that you have in assets    IBOutlet weak var extraShotCheckbox  UIButton    IBAction func extraShotCheckBoxAction   sender  Any        extraShotCheckbox setImage changeCheckBoxImage button  extraShotCheckbox   for   normal     func changeCheckBoxImage button  UIButton  - gt  UIImage       if let imageView   button imageView  let image   imageView image           if image    UIImage named   checkboxGrayOn                 return UIImage named   checkbox              else               return UIImage named   checkboxGrayOn                        return UIImage

User · Answer

if   imageForCheckMark image isEqual  UIImage imageNamed   crossCheckMark png      imageForCheckMark image isEqual  UIImage imageNamed   checkMark png

User · Answer

This code will help you out -  -  NSString   getFileName  UIImageView   imgView      NSString  imgName    imgView image  accessibilityIdentifier      NSLog       imgName       return imgName      Use this as -  NSString  currentImageName    self getFileName MyIImageView

User · Answer

You can use objective c Runtime feature for associating imagename with the UImageView   First import  import  lt objc runtime h gt  in your class  then implement your code as below    NSString  filename     exampleImage   UIImage  image    UIImage imagedName filename   objc setAssociatedObject image   imageFilename   filename  OBJC ASSOCIATION COPY   UIImageView  imageView     UIImageView alloc  initWithImage image     You can then get the image later  NSString  filename   objc getAssociatedObject imageView   imageFilename      Hope it helps you

User · Answer

There is no native way to do this  however  you could easily create this behavior yourself   You can subclass UIImageView and add a new instance variable   NSString  imageFileName    Then you could override setImage  first setting imageFileName to the filename of the image you re setting  and then calling  super setImage imageFileName    Something like this   - void  setImage  NSString  fileName      imageFileName   fileName      super setImage fileName       Just because it can t be done natively doesn t mean it isn t possible

User · Answer

The code is work in swift3 - write code inside didFinishPickingMediaWithInfo delegate method  if let referenceUrl   info UIImagePickerControllerReferenceURL  as  NSURL     ALAssetsLibrary   asset for  referenceUrl as URL   resultBlock    asset in    let fileName   asset  defaultRepresentation   filename     print fileName        do whatever with your file name                  failureBlock  nil

User · Answer

Or you can use the restoration identifier  like this   let myImageView   UIImageView   myImageView image   UIImage named   anyImage   myImageView restorationIdentifier    anyImage     Same name as image s name      Later  in UI Tests  print myImageView restorationIdentifier      Prints  anyImage    Basically in this solution you re using the restoration identifier to hold the image s name  so you can use it later anywhere  If you update the image  you must also update the restoration identifier  like this   myImageView restorationIdentifier    newImageName    I hope that helps you  good luck

User · Answer

No no no    in general these things are possible  It ll just make you feel like a dirty person  If you absolutely must  do this    Create a category with your own implementation of  imageNamed  NSString  imageName that calls through to the existing implementation and uses the technique identified here  How do I use objc setAssociatedObject objc getAssociatedObject inside an object   to permanently associate imageName with the UIImage object that is returned   Use Method Swizzling to swap the provided implementation of imageNamed  for your implementation in the method lookup table of the Objective-C runtime  Access the name you associated with the UIImage instance  using objc getAssociatedObject  anytime you want it    I can verify that this works  with the caveat that you can t get the names of UIImage s loaded in NIBs  It appears that images loaded from NIBs are not created through any standard function calls  so it s really a mystery to me    I m leaving the implementation up to you  Copy-pasting code that screws with the Objective-C runtime is a very bad idea  so think carefully about your project s needs and implement this only if you must

[ios] UIImageView - How to get the file name of the image assigned?

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