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Swift - dynamically resizes UIButton

I am trying to dynamically change the UIButton frame but it doesn't work.

@IBOutlet weak var button1: UIButton!

@IBAction func btn_move2_touchupinside(sender: AnyObject, forEvent event: UIEvent) {
           button1.frame = CGRectMake(0, 0, 100, 100)
}

I am guessing that I have to reload the button after changing the frame. Can anyone please help?

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2 answers


Automatic layout prevents you from updating the frame with buttons. Here are three different ways to make this work the easiest to set up:



  • Disable automatic layout. In the Builder interface, click on the View controller. Then in the File Inspector at the far right, uncheck the Use Auto Layout box.

  • Define your program programmatically in ViewDidLoad

    :

    let button = UIButton.buttonWithType(.System) as UIButton
button.frame = CGRectMake(200, 200, 100, 100)
button.addTarget(self, action: "btn_move2_touchupinside:forEvent:", forControlEvents: .TouchUpInside)
button.setTitle("New Button", forState: .Normal)
self.view.addSubview(button)

  • Configure 4 constraints for your button (horizontal offset from top margin of supervisor, vertical offset from top layout guide, width and height). Configure @IBOutlets

    for these constraints and then update their properties constant

    in code.

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Simple use of this code will work fine:

button.layer.frame = newFrame


Or you need to reset the center of the button:

button.frame = newFrame
button.center = newCenter
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