Access text label inside a button - Unity 5.1.4

Questions & Answers
1

How to change button’s label text? I tried these codes:

playBtnLabel = playBtn.gameObject.GetComponent<Text>();

// playBtnLabel is null and

playBtnLabel = playBtn.GetComponent<Text>();

// again playBtnLabel is null

What do i do wrong?

2

Try

playBtn.gameObject.GetComponentInChildren<Text>();

It works!