cachedTextGenerator alway return zero in the start function

I want to repeat some character in one row line in the UI Text .so I should get the uicharinfo about my specify character. when i fill the character in the text, and play game, nothing return in the start function. If i debug game, it will return value . it's very strange for me . anyone can help me , or tell me better way to solve my solution (for example ,fill "=" ,in one row according to the screen width.)