Question by Moubien · May 14, 2017 at 09:21 PM · prefab button start listener

A Problem with button listener in Start()

Hello I have a Button prefab which I want to assign different methods for it depends on some condition but when I add my code to Start() it get called once. and If I add it to update it gets called a lot of time which crashes the application here is my code: void Start () {

    if (Pick1)
    {
         Power1 = Instantiate(b, panel.transform, true) as GameObject;
         //GUI adjustment
         Power1.transform.localScale = new Vector3(1, 1, 1);
         Power1.transform.position = new Vector3(0, 0, 100);
         Power1.GetComponent<Button>().onClick.AddListener(() => Freeze());
    }

}

Freeze() method only getting called 1 time no matter how many times I press the button any suggestion please?

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SohailBukhari · May 15, 2017 at 08:19 AM 0

If you add listener in the start then AddListener only call one time because start calls only once. Lets suppose you want to add listener again when object triggers, then you need to remove all listeners and then again add new listener.

 void Start ()
     {
         btn.onClick.AddListener(Func1);
     }
 
 void OnTriggerEnter()
 {
     btn.onClick.RemoveAllListeners();
     btn.onClick.AddListener(Func2);
 
 }
 
 void Func1()
 {
     Debug.Log("func1");
 }
 void Func2()
 {
     Debug.Log("func2");
 }

Masterio · May 15, 2017 at 08:23 AM 0

https://unity3d.com/learn/tutorials/topics/user-interface-ui/ui-button

RobAnthem · May 15, 2017 at 08:24 AM 0

This should work, what exactly does Freeze() do? Perhaps it is something in the Freeze() method that affects the button? Also no need for a lambda, you can just assign it like this

 Power1.GetComponent<Button>().onClick.AddListener(Freeze);

I think the lambda might be your issue, since it compiles differently.

taxvi · May 15, 2017 at 09:36 AM 0

can you share the code of your Freeze() function?

A Problem with button listener in Start()

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