I want to change the transparency or visibility (alpha) with a UI button

Question

Hi, I am trying to enable an UI Button, but I cant....I want to enable my script with the function (On Click) adding the Update function. But it doesn't work.

Basically I want to change the transparency or visibility (alpha) with this button

Please any advice is more than welcome.

 private var a : float = 1; // alpha starts at 1
 var fadeSpeed : float = 2;
 private var Green : b!oolean = true;
  
 function Update(){
   
     if(Green == true){
         GetComponent.<UI.Text>().material.color.a = Mathf.Lerp(GetComponent.<UI.Text>().material.color.a, 1, Time.deltaTime * fadeSpeed);
 
     }else{
 
         GetComponent.<UI.Text>().material.color.a = Mathf.Lerp(GetComponent.<UI.Text>().material.color.a, 0, Time.deltaTime * fadeSpeed);
     }    
 }![alt text][1]

[1]: /storage/temp/56618-capture.jpg

Answer 1

Answer by allenallenallen · Oct 21, 2015 at 01:14 PM

OnClick() only works with a function you created yourself.

Make a new function called ChangeAlpha() or soemthing and copy the contents in Update() into it.

 function ChangeAlpha(){
     // if(Green == true){...... blah blah blah blah
 }

Then you'll see the option to call it in the editor menu.

On a side note, you don't need to write "Green == true". You just need to write "Green"

 if (Green){
 }
 else{
 }

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paco morales · Oct 21, 2015 at 02:47 PM 0

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Hi allenallenallen,

Thanks for your replay.

I did make the changes, but when I hit the button the alpha only change a little, I have to hit the button several times in order to make the text invisible.

Is there other think I can do?

Thanks for your help!

 private var a : float = 1; // alpha starts at 1
 var fadeSpeed : float = 1;
 private var Green : boolean = true;
  
  
 function ChangeAlpha(){
   
     if(Green){
 
         GetComponent.<UI.Text>().material.color.a = $$anonymous$$athf.Lerp(GetComponent.<UI.Text>().material.color.a, 0, Time.deltaTime * fadeSpeed);
     }
     else{
 
         GetComponent.<UI.Text>().material.color.a = $$anonymous$$athf.Lerp(GetComponent.<UI.Text>().material.color.a, 1, Time.deltaTime * fadeSpeed);
     }    
 }

allenallenallen paco morales · Oct 21, 2015 at 03:31 PM 0

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Do you want it to happen instantly or fade in/out?

Fade: http://answers.unity3d.com/questions/225438/slowly-fades-from-opaque-to-alpha.html

allenallenallen allenallenallen · Oct 22, 2015 at 12:38 AM 1

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Use a simple boolean.....

Learn some simple coding even if you're strictly a 3D modeler.

 if(Green){
      GetComponent.<UI.Text>().material.color.a = 0;
      Green = false;
 
  }
  else{
      GetComponent.<UI.Text>().material.color.a = 1;
      Green = true;
 
  }

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paco morales · Oct 21, 2015 at 02:50 PM 0

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Basically I want to hit one time the button and make invisible the text and hit again the button and make the text visible again.

I want to change the transparency or visibility (alpha) with a UI button

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