Aligning UIButtons/UITextFields in the center

I 开发者_如何转开发know that you can align UILabels in the center by typing this code:

label.textAlignment = UITextAlignmentCenter

Two questions: 1), how do you do the same for UIButtons and UITextFields? And 2), will these objects remain in the center after the device is rotated? Thanks for your help!

---

1. UIButton has UILabel inside. You can access it via titleLabel property:

button.titleLabel.textAlignment = UITextAlignmentCenter;

2. Yes, they will remain in center

3. You can find more info about UIButton in UIButton's Class Reference.