GetKeyUp not working sometimes.

Hey, I tryed to make some accelerator that while i click,then values are getting bigger and when i release the mouse button/touch/ pressing "space" something will happend.
i am using those functions:

Code (CSharp):

1.        if (Input.touchCount > 0 || (Input.GetMouseButton(0)) || Input.GetKey("space"))
2.             {
3. //Do something
4. }

Code (CSharp):

1.     if (Input.GetMouseButtonUp(0) || Input.GetKeyUp("space"))
2.             {
3. // Do something
4. }

It works totally fine but sometimes the release is not working.
Any ideas?

 

Edit: I think its because my function was at Fixed update.

 

You're correct. Fixed Update can run >= 0 times per frame, so getting an Up or Down key (or button) during that method is not reliable.

 

Never take input at FixedUpdate unless its checking if its down or not (getkey without up/down)