I m trying to set a click listener programmatically in an iO

Question

I m trying to set a click listener programmatically in an iOS application and I m getting an error because I m setting the bridge incorrectly What should the value be for the bridge ``` ExportObjCClass class ViewController UIViewController constructor aDecoder NSCoder super aDecoder override fun initWithCoder aDecoder NSCoder = initBy ViewController aDecoder ObjCOutlet lateinit var label UILabel ObjCOutlet lateinit var textField UITextField ObjCOutlet lateinit var button UIButton override fun viewDidLoad super viewDidLoad button addTarget this action=sel registerName buttonPressed forControlEvents=UIControlEventTouchDown ObjCMethod selector = buttonPressed bridge = ViewController fun buttonPressed label text = Konan says 2 $ textField text ```

Vyacheslav Karpukhin [JB] · Answer

If you replace the entire ` ObjCMethod` annotation with ` ObjCAction` like in the sample it seems to work

spierce7 · Answer

It does Why does it work

Vyacheslav Karpukhin [JB] · Answer

Let s ask < svyatoslav scherbina>

spierce7 · Answer

I m also interested why something like this won t work to make click listeners easier ``` ExportObjCClass class ViewController UIViewController constructor aDecoder NSCoder super aDecoder override fun initWithCoder aDecoder NSCoder = initBy ViewController aDecoder ObjCOutlet lateinit var label UILabel ObjCOutlet lateinit var textField UITextField ObjCOutlet lateinit var button UIButton override fun viewDidLoad super viewDidLoad button onClick label text = Konan says Hello $ textField text fun UIButton onClick onClick gt Unit val handler = ClickHandler onClick this addTarget handler sel registerName buttonPressed UIControlEventTouchUpInside ExportObjCClass class ClickHandler private val onClick gt Unit Suppress unused ObjCAction fun buttonPressed onClick ```

svyatoslav.scherbina · Answer

gt It does Why does it work ` ObjCMethod` annotation is not supposed to be applied this way thus it doesn t work ` ObjCAction` annotation is designed for this case so it works

svyatoslav.scherbina · Answer

gt I m also interested why something like this won t work to make click listeners easier Your code has a couple of issues 1 `ClickHandler` should extend `NSObject` class 2 `addTarget` requires the target object `handler` in your case to be stored somewhere to prevent from being removed gt The control does not retain the object in the target parameter It is your responsibility to maintain a strong reference to the target object while it is attached to a control So you can create a list of handlers in `ViewController` and add all handlers to that list The list should be cleared when view is being unloaded because otherwise you would leave a cycle of objects referencing each other with strong references and since that cycle would contain Objective C object `ViewController` it would not be deleted by Kotlin Native garbage cycle collector By the way it is not necessary to add ` ExportObjCClass` to `ClickHandler`

spierce7 · Answer

Thanks for the help I was able to get it working slightly smiling face Something tells me that I m going to find a lot of little things like this very annoying coming from Android to iOS