How to assign an action for UIImageView object in Swift

Question

I m trying to assign an UIImageView to an action when the user taps it   I know how to create an action for a UIButton  but how could I mimic the same behavior of a UIButton  but using a UIImageView

User · Answer

For swift 2 0 and above do this   IBOutlet weak var imageView  UIImageView      override func viewDidLoad             super viewDidLoad              Do any additional setup after loading the view  typically from a nib          let tap   UITapGestureRecognizer target  self  action   selector ViewController tappedMe           imageView addGestureRecognizer tap          imageView userInteractionEnabled   true           func tappedMe                 print  Tapped on Image

User · Answer

You ll need a UITapGestureRecognizer  To set up use this   override func viewDidLoad         super viewDidLoad        let tapGestureRecognizer   UITapGestureRecognizer target  self  action   selector imageTapped tapGestureRecognizer         imageView isUserInteractionEnabled   true     imageView addGestureRecognizer tapGestureRecognizer      objc func imageTapped tapGestureRecognizer  UITapGestureRecognizer        let tappedImage   tapGestureRecognizer view as  UIImageView         Your action      You could also use a UIButton and assign an image to it  without text and than simply connect an IBAction

User · Answer

Swift4 Code  Try this some new extension methods   import UIKit  extension UIView        fileprivate struct AssociatedObjectKeys           static var tapGestureRecognizer    MediaViewerAssociatedObjectKey mediaViewer             fileprivate typealias Action       - gt  Void         fileprivate var tapGestureRecognizerAction  Action            set               if let newValue   newValue                      Computed properties get stored as associated objects                 objc setAssociatedObject self   amp AssociatedObjectKeys tapGestureRecognizer  newValue  objc AssociationPolicy OBJC ASSOCIATION RETAIN                                  get               let tapGestureRecognizerActionInstance   objc getAssociatedObject self   amp AssociatedObjectKeys tapGestureRecognizer  as  Action             return tapGestureRecognizerActionInstance                       public func addTapGestureRecognizer action      - gt  Void              self isUserInteractionEnabled   true         self tapGestureRecognizerAction   action         let tapGestureRecognizer   UITapGestureRecognizer target  self  action   selector handleTapGesture           self addGestureRecognizer tapGestureRecognizer               objc fileprivate func handleTapGesture sender  UITapGestureRecognizer            if let action   self tapGestureRecognizerAction               action              else               print  no action                        Now whenever we want to add a UITapGestureRecognizer to a UIView or UIView subclass like UIImageView  we can do so without creating associated functions for selectors   Usage    profile ImageView addTapGestureRecognizer           print  image tapped

User · Answer

You can put a UIButton with a transparent background over top of the UIImageView  and listen for a tap on the button before loading the image

User · Answer

You could actually just set the image of the UIButton to what you would normally put in a UIImageView  For example  where you would do   myImageView image   myUIImage   You could instead use   myButton setImage myUIImage  forState  UIControlState Normal    So  here s what your code could look like   override func viewDidLoad      super viewDidLoad      var myUIImage  UIImage   set the UIImage here   myButton setImage myUIImage  forState  UIControlState Normal      IBOutlet var myButton  UIButton   IBAction func buttonTap sender  UIButton        handle the image tap     The great thing about using this method is that if you have to load the image from a database  you could set the title of the button before you set the image   myButton setTitle  Loading Image      forState  UIControlState Normal    To tell your users that you are loading the image

User · Answer

Swift 4 Code    Step 1 In ViewdidLoad       let pictureTap   UITapGestureRecognizer target  self  action   selector MyInfoTableViewController imageTapped          userImageView addGestureRecognizer pictureTap         userImageView isUserInteractionEnabled   true   Step 2 Add Following Function   objc func imageTapped              let imageView   userImageView         let newImageView   UIImageView image  imageView  image          newImageView frame   UIScreen main bounds         newImageView backgroundColor   UIColor black         newImageView contentMode    scaleAspectFit         newImageView isUserInteractionEnabled   true         let tap   UITapGestureRecognizer target  self  action   selector dismissFullscreenImage           newImageView addGestureRecognizer tap          self view addSubview newImageView           self navigationController  isNavigationBarHidden   true         self tabBarController  tabBar isHidden   true          It s Tested And Working Properly

User · Answer

You need to add a a gesture recognizer  For tap use UITapGestureRecognizer  for tap and hold use UILongPressGestureRecognizer  to your UIImageView   let tap   UITapGestureRecognizer target  self  action   selector YourClass tappedMe   imageView addGestureRecognizer tap  imageView isUserInteractionEnabled   true   And Implement the selector method like    objc func tappedMe         println  Tapped on Image

User · Answer

Need to add lazy for TapGestureRecognizer to register  since the  self  in UITapGestureRecognizer target  self      will be nil if it s not a lazy var  Even if you set isUserInteractionEnable   true  it won t register without lazy var    lazy var imageSelector   UIImageView         let image   UIImageView image   imageName png         now add tap gesture     image isUserInteractionEnabled   true     image addGestureRecognizer UITapGestureRecognizer target  self  action   selector handleImageSelector        return image      objc private func handleImageSelector         print  Pressed image selector

User · Answer

You can add a UITapGestureRecognizer to the imageView  just drag one into your Storyboard xib  Ctrl-drag from the imageView to the gestureRecognizer  and Ctrl-drag from the gestureRecognizer to the Swift-file to make an IBAction   You ll also need to enable user interactions on the UIImageView  as shown in this image

User · Answer

I suggest to place invisible opacity   0  button on your imageview and then handle interaction on button

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