Unable to change image for the button in swift 3? - ios

Question

In my code for checkmark I used button to change images for selected and unselected but unable to implement if I click on it's changing to unchecked but again selecting button it's unable to change to check image can anyone help me how to resolve this ?
var checkedImage = UIImage(named: "check")! as UIImage
var uncheckedImage = UIImage(named: "uncheck")! as UIImage
var isChecked: Bool = true
var checkMarkSelected = 0
checkMarkButton.addTarget(self, action: #selector(checkMarkAction(button:)), for: .touchUpInside)
func checkMarkAction(button : UIButton) {
if isChecked == true {
checkMarkButton.setImage(checkedImage, for: .selected)
isChecked = false
checkMarkSelected = 1
}
else {
checkMarkButton.setImage(uncheckedImage, for: .normal)
isChecked = true
checkMarkSelected = 0
}
}

Answer 1

Step 1: Select your CheckUIButton and set Image “Uncheck” (state config must be Default in attribute inspector)
Step 2: In attribute inspector change state config to Selected and set image “Check”
Step 3: Put following code in your UIButton action.
#IBAction func checkclick(_ sender: UIButton) {
sender.isSelected = !sender.isSelected
}

Answer 2

In Swift 3
#IBAction func btntouchupInsideevent(_ sender: UIButton)
{
if yourbtnOutletName.currentImage == "YourCheckImageName"
{
yourbtnOutletName.setImage(YourUncheckImage.imagetype, for: .normal)
}
else
{
btnIsEventRecouring.setImage(YourcheckImage.imagetype, for: .normal)
}
}

Answer 3

I think that you should add the action in the viewDidLoad() function of your view controller for that button or, if you are declaring it in a stand-alone UIButton inherited class in order to reuse it in the future in many view controllers, you should add the target in the initialiser of the UIButton.
If the code is written in that way is even strange that Xcode is not giving you warnings...
EDIT: This is a code snippet of how I would do it
//Comments
import UIKit
class ViewController: UIViewController {
//link this to the checkmark buttons
//subclass UIButton making a button with the property isChecked: Bool
#IBOutlet weak var checkmarkButton: UICheckButton!
var checkMarkSelected = 0
override function viewDidLoad() {
//do stuff with your viewdidload
}
//link this to the checkmark buttons
#IBAction func checkMarkAction(sender: UICheckButton) {
if sender.isChecked == false {
let checkedImage = UIImage(named: "check")
checkMarkButton.setImage(checkedImage, for: .normal)
sender.isChecked = true
checkMarkSelected += checkMarkSelected
} else {
let uncheckedImage = UIImage(named: "uncheck")
checkMarkButton.setImage(uncheckedImage, for: .normal)
sender.isChecked = false
checkMarkSelected -= checkMarkSelected
}
}

Answer 4

In Swift 4:
#IBOutlet weak var termsAndConditionsButton: UIButton!
if termsAndConditionsButton.isSelected == true {
termsAndConditionsButton.setImage(UIImage(named: "checkboxOff"), for: .normal)
termsAndConditionsButton.isSelected=false
}
else{
termsAndConditionsButton.setImage(UIImage(named: "checkboxOn"), for: .normal)
termsAndConditionsButton.isSelected=true
}

Answer 5

Try with this on IBAction function
sender.isSelected = !sender.isSelected
if sender.isSelected == true {
sender.isSelected = true
sender.setImage(UIImage(named: "img_on"), for: UIControl.State.selected)
}else{
sender.isSelected = false
sender.setImage(UIImage(named: "img_off"), for: UIControl.State.normal)
}