I have seen multiple questions on how to implement a checkbox by just changing the background image when clicked, but I don't understand why the checkbox only shows when I add it to my ViewController setupViews.
It simply will not show up or change when I have all the functionality in my actionButton function. Should i be using a protocol and delegate set up to get my button showing changing when clicked? Below is my code, I am hoping someone can shed some light as to what I am missing here?
class MainMenuViewController: UIViewController {
let clickingCheckbox = ClickingCheckbox()
var checkbox = UIImage(named: "Checked_Checkbox")
var empty_checkbox = UIImage(named:"Empty_Checkbox")
var isBoxClicked: Bool!
override func viewDidLoad() {
super.viewDidLoad()
setupViews()
}
func setupViews() {
self.backgroundImage.addSubview(contentView)
self.contentView.addSubview(clickingCheckbox)
clickingCheckbox.snp.makeConstraints { (make) in
make.top.equalTo(signInButton.snp.bottom).offset(-MainMenuViewController.padding)
make.leading.equalTo(buttonView)
make.width.equalTo(signInButton).multipliedBy(0.2)
make.height.equalTo(clickingCheckbox.snp.width)
}
clickingCheckbox.addTarget(self, action: #selector(buttonAction(_:)), for: .touchUpInside)
clickingCheckbox.setImage(empty_checkbox, for: UIControlState.normal) #The checkbox only shows on screen if I put it here, however it does nothing when clicked!
}
#objc func buttonAction(_ sender: ClickingCheckbox) {
if isBoxClicked == true {
isBoxClicked = false
}else{
isBoxClicked = true
}
if isBoxClicked == true {
sender.setImage(checkbox, for: UIControlState.selected)
}else{
sender.setImage(empty_checkbox, for: UIControlState.normal)
}
print("test")
}
In my Class I have.....
class ClickingCheckbox: UIButton {
override func draw(_ rect: CGRect) {
super.draw(rect)
}
}
I have tried keeping the buttonAction functionality in the class, but that didn't work, I have tried a multiple different ways but can't get my head around how to show it working. All other advice is given to implement using IBOutlets so this would be really helpful for me to understand. Thanks
Try something like this:
class ClickingCheckbox: UIButton {
convenience init() {
self.init(frame: .zero)
self.setImage(UIImage(named: "Empty_Checkbox"), for: .normal)
self.setImage(UIImage(named: "Checked_Checkbox"), for: .selected)
self.addTarget(self, action: #selector(buttonTapped), for: .touchUpInside)
}
#objc private func buttonTapped() {
self.isSelected = !self.isSelected
}
}
Related
I just started learning Swift. I am following this Apple tutorial but I was met with this error. I copied the exact code from the tutorial. Not sure where did I go wrong.
Error message:
"Type 'RatingControl' has no member 'ratingButtonTapped(button:)'"
//Mark: Private Methods
private func setupButtons() {
for _ in 0..<5 {
//Create the button
let button = UIButton()
button.backgroundColor = UIColor.red
//Add constraints
button.translatesAutoresizingMaskIntoConstraints = false
button.heightAnchor.constraint(equalToConstant: 44.0).isActive = true
button.widthAnchor.constraint(equalToConstant: 44.0).isActive = true
//Setup the button action
button.addTarget(self, action: #selector(RatingControl.ratingButtonTapped(button:)), for: .touchUpInside)
//Add the button to the stack
addArrangedSubview(button)
//Add the new button to the rating button array
ratingButtons.append(button)
}
}
Initial to get the button action the RatingControl.swift class will be like
import UIKit
#IBDesignable class RatingControl: UIStackView {
//MARK: Initialization
override init(frame: CGRect) {
super.init(frame: frame)
}
required init(coder: NSCoder) {
super.init(coder: coder)
}
//MARK: Button Action
#objc func ratingButtonTapped(button: UIButton) {
print("Button pressed")
}
}
Create a file named RatingControl.swift with code and run your project. This issue will be resolved.
if you already have the full class the just add #objc before the method ratingButtonTapped.
More info: You can download the full project of the tutorial you currently following. The download link is present at the bottom.
We truly need to see the whole RatingControl class in order give you a complete answer. However your problem based on the error is that you there is no function with the name ratingButtonTapped inside your RatingControl class. There should be a class like the following in order to register it as a target to a button.
Example of .addTarget usage:
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
//Setup the button action
let button = UIButton()
button.addTarget(self, action: #selector(ratingButtonTapped(_:)), for: .touchUpInside)
view.addSubview(button)
}
#objc func ratingButtonTapped(sender: UIButton) {
// Triggered when the button is pressed
}
}
In my ViewController,
there is multiple buttons connected to the same action
my button is like check or uncheck
I have tried below
My action is triggered, but image didn't change
var uncheckBoxImage = UIImage(named: "uncheckBox")
var checkBoxImage = UIImage(named: "checkBox")
override func viewDidLoad() {
super.viewDidLoad()
for button in buttons{
button?.setImage(uncheckBoxImage, for: .normal)
//every button I set uncheckBoxImage first.
}
}
#IBAction func btnAction(_ sender: UIButton) { //connect every button
if sender.imageView == checkBoxImage {
sender.setImage(uncheckBoxImage, for: .normal)
}else {
sender.setImage(checkBoxImage, for: .normal)
}
}
I also tried below, but it can't process multiple button
var cube:Bool = false
#IBAction func btnAction(_ sender: Any) {
cube = !cube
if cube {
sender.setImage(checkBoxImage, for: .normal)
} else {
sender.setImage(uncheckBoxImage, for: .normal)
}
}
How should I fix these situation ?
Like it has some questions for you
And you just need to click to be check or click again to be uncheck
The trick is to use the selectedState for buttons.
Set both images for .normal and .selected state:
button?.setImage(uncheckBoxImage, for: .normal)
button?.setImage(checkBoxImage, for: .selected)
then, in IBAction:
#IBAction func btnAction(_ sender: UIButton) {
sender.isSelected = !sender.isSelected
...
}
You should implement different button's state, it will change image automatically
var uncheckBoxImage = UIImage(named: "uncheckBox")
var checkBoxImage = UIImage(named: "checkBox")
override func viewDidLoad() {
super.viewDidLoad()
for button in buttons{
button?.setImage(uncheckBoxImage, for: .normal)
button?.setImage(checkBoxImage, for: .selected)
}
}
#IBAction func btnAction(_ sender: UIButton) { //connect every button
sender.isSelected = !sender.isSelected
}
Hi Please try with a tintcolor if that works
var uncheckBoxImage = UIImage(named: "uncheckBox")
var checkBoxImage = UIImage(named: "checkBox")
override func viewDidLoad() {
super.viewDidLoad()
for button in buttons{
button?.setImage(uncheckBoxImage, for: .normal)
button?.tintColor = UIColor.clear
}
}
#IBAction func btnAction(_ sender: UIButton) {
if sender.tintColor == UIColor.clear {
sender.setImage(checkBoxImage, for: .normal)
sender.tintColor = UIColor.green
}else if sender.tintColor == UIColor.green {
sender.setImage(uncheckBoxImage, for: .normal)
sender.tintColor = UIColor.clear
}
}
For just two states, abstracting "normal" and "selected", it's better to use the above answers, but if you need to handle multiple cases, you can use <#UIButton#>.currentImage!.isEqual(to: foo), to compare images and use only .normal state.
This is an example:
#IBAction func btnAction(_ sender: UIButton) {
if sender.currentImage != nil && sender.currentImage!.isEqual(UIImage(named: "a")) {
sender.setImage(UIImage(named: "b"), for: .normal)
} else {
sender.setImage(UIImage(named: "a"), for: .normal)
}
}
If you want multiple selection then you can use.
override func viewDidLoad() {
super.viewDidLoad()
for button in buttons {
button.setImage(UIImage(named: "uncheckBox"), for: .normal)
button.setImage(UIImage(named: "checkBox"), for: .selected)
button.tintColor = .clear
}
}
#IBAction func btnAction(_ sender: UIButton) {
// toggle automatic changes selection state
sender.isSelected.toggle()
}
How can I make a UIButton change image from A to B and again B to A, every time it's pressed?
Not as .normal to .highlighted, but permanent.
I've tried the .highlighted method because I can't find the code for permanent, here's my code:
func ChangeButton() {
Button.setImage(A, for: .normal)
Button.setImage(B, for: .highlighted)
Thanks for mentions of setBackgroundImage to Xavier L. from the other answer.
Try the following code:
import UIKit
class ViewController: UIViewController {
#IBOutlet var button: UIButton!
var buttonActive = false
override func viewDidLoad() {
super.viewDidLoad()
button.setBackgroundImage(UIImage(named: "apple"), for: .normal)
}
#IBAction func buttonPressed() {
if buttonActive {
button.setBackgroundImage(UIImage(named: "apple"), for: .normal)
} else {
button.setBackgroundImage(UIImage(named: "pineapple"), for: .normal)
}
buttonActive = !buttonActive
}
}
And your storyboard should look like that:
N.B. On Stack Overflow you should perform some actions before asking. Try to include some code you tried.
I recommend changing the backgroundImage because it's scaled automatically, and the button text in front won't get covered.
If it's a custom button, within its initializer:
self.addTarget(self, action: #selector(*yourfunctoswitchimages*), for: .touchUpInside)
... and then that yourfunctoswitchimages can just check what the current background image is, and switch it accordingly.
If it's not a custom button, add a target to it in viewDidLoad or something. Here's a lot of sample code.
In your viewDidLoad()
yourButt.addTarget(self, action: #selector(switcheroo), for: .touchUpInside)
Another func in your view controller:
func switcheroo()
{
if yourButt.currentBackgroundImage == image1
{
yourButt.setBackgroundImage(image2), for: .normal)
}
else { // ...set image to image1 }
}
yourButt would be a property of your view controller of course, that way it's accessible to the viewDidLoad() and to other funcs within it.
In my app I'm using UIButton as check button. I have around 10 UIButton which all should toggle between two Image. An image which shows a "x" and another which shows a check mark. I have an action event for each UIButton, but since all 10 UIButton toggle between two images, is there a way to achieve this the best way. Right now I only know this solution, where I have a Boolean flag for each button and when toggle I set the flag to either true or false. But for me this seems like a bad practice.
Example for one of the UIButton:
var MenuBtnSelect = false
func GlutenSelect(sender: AnyObject)
{
if(!MenuBtnSelect)
{
sender.setImage(UIImage(named: "CheckMark"), forState: .Normal)
MenuBtnSelect = true
}
else
{
sender.setImage(UIImage(named: "NotCheckMark"), forState: .Normal)
MenuBtnSelect = false
}
}
First of all you have to set the NotCheckMark image for every button, then you can create the same without the boolean flag.
#IBAction func pushAnyButton(sender: AnyObject) {
if let btnImage : UIButton = sender as? UIButton {
if (btnImage.currentImage == UIImage(named: "CheckMark"))
{
btnImage.setImage(UIImage(named: "NotCheckMark"), forState: .Normal)
}
else
{
btnImage.setImage(UIImage(named: "CheckMark"), forState: .Normal)
}
}
}
You can use this function for all the 10 button if you connect this method to the buttons. Or you can this in more compact way like this:
#IBOutlet weak var anyCheckBoxButton: UIButton!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
anyCheckBoxButton.setImage(UIImage(named: "CheckMark"), forState: .Selected )
anyCheckBoxButton.setImage(UIImage(named: "NotCheckMark"), forState: .Normal )
}
#IBAction func pushAnyCheckBoxButton(sender: AnyObject) {
anyCheckBoxButton.selected = !anyCheckBoxButton.selected
}
The second idea came from here.
Just give every button you want to use as a check mark a tag = 1000. if sender.tag == 1000 it is off, set it to 1001 and change the image. Try like this:
import UIKit
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
#IBAction func switchImage(sender: UIButton) {
sender.toggleSwitch
}
}
extension UIButton {
var toggleSwitch: Bool {
if tag == 1000 {
tag = 1001
setImage(UIImage(named: "CheckMark"), forState: .Normal)
return true
} else {
tag = 1000
setImage(UIImage(named: "NotCheckMark"), forState: .Normal)
return false
}
}
}
I am trying to create 4 UIButtons that highlight and stay highlighted when they are clicked. The only problem is I need only one UIButton to be Highlighted at a time. So, if there is a UIButton highlighted already, I need it to be "unhighlighted" and highlight the UIButton I clicked. I have tried to do this before and failed. Please help me with this problem.
I am using the Swift coding language to do this.
Any input or suggestions would be greatly appreciated.
If you give this answer an upvote, remember to upvote dasblikenlight's answer as well.
class ViewController: UIViewController {
// Connect all 4 buttons to this outlet
#IBOutlet var radioGroup: [UIButton]!
// Connect this action to all 4 buttons
#IBAction func radioGroupClicked(sender: AnyObject) {
// Unhighlight all buttons
unhighlightRadioGroup()
// Highlight the one being clicked on
highlightRadioGroup(sender as! UIButton)
}
// Set all 4 buttons in unselected state
func unhighlightRadioGroup() {
for button in radioGroup {
button.selected = false
}
}
// Set one button in the selected state
func highlightRadioGroup(button : UIButton) {
button.selected = true
}
}
You can do it with an IBOutletCollection. Command-drag one of the buttons into the view controller code, and choose creating of an IBOutletCollection on drop, and name your collection something - say, radioGroup. Then control-drag the remaining three buttons into the same IBOutletCollection.
Next thing is to add a method to un-highlight all buttons in your radioGroup. This can be done with a simple loop.
Finally, add calls to unhighlightRadioGroup from the event handler of your buttons. Event handler should first call your unhighlightRadioGroup method, and then highlight the sender received in the event handler.
lazy var buttonsArray: [UIButton] = {
var buttons = [UIButton]()
let firstButton = UIButton()
let secondButton = UIButton()
let thirdButton = UIButton()
let fourthButton = UIButton()
buttons = [firstButton, secondButton, thirdButton, fourthButton]
return buttons
}()
private func setupButtonMethods() {
filteredButtons[0].addTarget(self, action: #selector(firstButtonPressed(sender:)), for: .touchUpInside)
filteredButtons[1].addTarget(self, action: #selector(secondButtonPressed(sender:)), for: .touchUpInside)
filteredButtons[2].addTarget(self, action: #selector(thirdButtonPressed(sender:)), for: .touchUpInside)
filteredButtons[3].addTarget(self, action: #selector(fourthButtonPressed(sender:)), for: .touchUpInside)
}
private func setupHiglightedStateOnButton(button: UIButton) {
for btn in buttonsArray {
btn.isSelected = false
btn.backgroundColor = .gray
btn.setTitleColor(.white, for: .normal)
btn.isUserInteractionEnabled = true
}
button.isSelected = true
button.backgroundColor = .yellow
button.setTitleColor(.black, for: .normal)
button.isUserInteractionEnabled = false
}
#objc func firstButtonPressed(sender: UIButton) {
setupHiglightedStateOnButton(button: sender)
}
#objc func secondButtonPressed(sender: UIButton) {
setupHiglightedStateOnButton(button: sender)
}
#objc func thirdButtonPressed(sender: UIButton) {
setupHiglightedStateOnButton(button: sender)
}
#objc func fourthButtonPressed(sender: UIButton) {
setupHiglightedStateOnButton(button: sender)
}
remember to call setupButtonMethods() inside viewDidLoad()