New UI Button Dynamic onClick Listener problem

Question

Hi everybody, I'm trying to add event listeners to some UI buttons at runtime. I have seen some examples, but for some reason the functions are not being added to my button, even when no error occurs. This is my code:

 Script A:
 
 public void DisplayPanel()
 {
     this.uiPanel = this.levelUIManager.GetLevelPanelFromPool() as LevelUIPanel;
     this.uiPanel.SetReplayFunction(() => TestLog());
 }
 
 public void TestLog()
 {
     Debug.Log("Replay");
 }
 
 //...
 //...
 
 Script B (LevelUIPanel)
 
 public void SetReplayFunction(UnityEngine.Events.UnityAction call)
 {
     Button button = this.replayButton.GetComponent<Button>();
     if(button)
     {
         Debug.Log("Button Found");//This line prints on console without problem
         button.onClick.AddListener(call);
     }
 }

Thanks in advance for your help

Answer 1

Best Answer

Answer by AndresBarrera · Jan 26, 2015 at 12:44 PM

Ok, I found the issue. My button was not calling the functions because there was another invisible button over it swallowing the click events. BUT the Inspector window for my uiPanel button was not displaying the dynamically added events on its list, so I thought there were not being added. This is probably a bug, it is confusing.

Also, for all wondering the syntax to add the functions, it could work with any of the following:

 AddListener(() => TestLog());
 
 //Or
 
 AddListener(() => { TestLog(); });
 
 //Or
 
 AddListener(TestLog);

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dakshvirr · Apr 25, 2018 at 07:48 AM 0

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Was having a similar problem but it was because of a UI mask that i had added. That mask was covering my button which is why it was not being detected. I just added the button as a child of the mask and it worked. Hope this helps someone too... :)

New UI Button Dynamic onClick Listener problem

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