为什么我的UIButton在Swift中会影响我的UIImageView？

Question

I'm building a simple app in Swift, and the app contains a png image, a UISegmentedControl, and a UIButton. Selecting different controls on the UISegmentedControl resizes an image of a pizza. When I click on "Large" in the UISegmentedControl, and then I press a button on the interface called submitOrderDisplay, it shrinks the image from its large size to its small size. I know it has something to do with the setTitle method I am using at the very bottom of the code, but I don't understand why that causes the image to reset to its default small size. If I remove the setTitle method, the resizing does not occur after I click the UIButton. I don't want the image to change size after the button is pressed. How do I achieve that?

import UIKit

class SecondViewController: UIViewController{


@IBOutlet weak var sizeChoiceControl: UISegmentedControl!
@IBOutlet weak var submitOrderDisplay: UIButton!
@IBOutlet weak var myImageView: UIImageView!


@IBAction func sizeSelected() {

    if(sizeChoiceControl.titleForSegmentAtIndex(sizeChoiceControl.selectedSegmentIndex)! == "Small"){
        myImageView.setHeight(height: 85)
        myImageView.setWidth(width: 85)
        myImageView.setX(x: 146)
        myImageView.setY(y: 63)
    }
    else if(sizeChoiceControl.titleForSegmentAtIndex(sizeChoiceControl.selectedSegmentIndex)! == "Medium"){
        myImageView.setHeight(height: 100)
        myImageView.setWidth(width: 100)
        myImageView.setX(x: 139)
        myImageView.setY(y: 55)
    }
    else if(sizeChoiceControl.titleForSegmentAtIndex(sizeChoiceControl.selectedSegmentIndex)! == "Large"){
        myImageView.setHeight(height: 115)
        myImageView.setWidth(width: 115)
        myImageView.setX(x: 131)
        myImageView.setY(y: 48)
    }
}

@IBAction func SubmitOrderClicked(sender: UIButton) { 

    submitOrderDisplay.setTitle("Update Order", forState: UIControlState.Normal)
}
}

Answer 1

Write the configuration of the button inside the viewDidLoad function:

submitOrderDisplay.setTitle("Update Order", forState: UIControlState.Normal)

I understand that you want to put the title Update Order.

If you want to change the title when pressed, you must call it for another State of the button like:

submitOrderDisplay.setTitle("Update Order", forState: UIControlState.Highlihgted)

If you change the configuration of the button for different states when an event happens, that must be why the size is ressetting.