實現思路

通過改變Constraint.constant的值來改變檢視的位置

實現步驟

1. 在storyboard中設定好佈局
   

2. 將要修改的Constraint連線成屬性到程式碼中
   

3. 在需要動畫的地方加上程式碼

    self.centerYConstraint.constant = 要移動的距離
    UIView.animate(withDuration: 動畫的時間) {
        self.view.layoutIfNeeded()
    }

完整程式碼

/// Swift3.1
import UIKit

class ViewController
 
: UIViewController {

    @IBOutlet weak var centerYConstraint: NSLayoutConstraint!

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
    }

    override func touchesBegan(_ touches: Set<UITouch>, with event
 
: UIEvent?) {
        self.centerYConstraint.constant = 200
        UIView.animate(withDuration: 1.5) {
            self.view.layoutIfNeeded()
        }
    }
}