Swift：如何移动在情节提要中添加的按钮位置

Question

I have added one button into one UIViewController in storyboard. Now I just want to try how can I move the origin x and y of that button from code so I write this code below

    @IBOutlet weak var testBtn: UIButton!

override func viewDidLoad() {
    super.viewDidLoad()


    testBtn.frame = CGRectMake(0, 0, 200, 10)

}

but The button not move. Do you know why?

Answer 1

You need to place it in viewDidAppear. Even viewWillLoad if not late enough.. Here is a good way to set it with little hassle:

override func viewDidAppear(animated: Bool) {
    super.viewDidAppear(animated)

    // Put the coordinates you want instead of x: 0, y: 0
    testBtn.center = CGPointMake(0, 0)
}

Remember that if you override this method, you must call super at some point in your implementation as recommended in the apple documentation. While not obligatory, it should relieve many problems ;)