I am creating a class to manage the checkboxes.
This is what I did:
import UIKit
class CheckboxButton: UIButton {
//let checked = ""
//let unchecked = ""
let checked = "bubu"
let unchecked = "baba"
var isChecked:Bool = false{
didSet{
if isChecked == true {
self.setTitle(checked, forState: UIControlState.Normal)
}else{
self.setTitle(unchecked, forState: UIControlState.Normal)
}
}
}
override func awakeFromNib() {
self.titleLabel?.font = UIFont(name: "FontAwesome", size: 20)
self.addTarget(self, action: "buttonClicked", forControlEvents: UIControlEvents.TouchUpInside)
self.isChecked = false
}
func buttonClicked(sender:UIButton){
if(sender == self){
if isChecked == true {
isChecked = false
}else{
isChecked = true
}
}
}
}
Everything is fine, but when I click on the button, the app just crashes with error Thread 1: signal SIGABRT
Is there something wrong?
Thanks for any help!
Since your action function takes parameters func buttonClicked(sender:UIButton) the action of your target should always contain : at the end, so all you have to do is to replace add target line with this
self.addTarget(self, action: "buttonClicked:", forControlEvents: UIControlEvents.TouchUpInside)
Also your buttonClicked function can be simplified like this:
func buttonClicked(sender:UIButton){
if(sender == self){
isChecked = !isChecked
}
}
Related
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
}
}
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
}
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)
}
}
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
}
}
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
}
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)
}
I have a button which I want to change background color and text when tapped(select) and bring it back to its original state when tapped again (deselect). I am able to select it but I am not being able to deselect it. I have researched on SO and I am getting errors in this code in the if-else part
#IBAction func btn1Pressed(_ sender: AnyObject) {
sender.setTitleColor(UIColor.blue, for: UIControlState.normal)
(sender as! UIButton).backgroundColor = UIColor.green
if sender.isSelected {
sender.selected = false
}
else {
sender.selected = true
}
}
Try this:
#IBAction func btnPressed(_ sender: AnyObject) {
guard let button = sender as? UIButton else { return }
if !button.isSelected {
button.isSelected = true
button.setTitleColor(UIColor.blue, for: UIControl.State.normal)
button.backgroundColor = UIColor.green
}
else {
button.isSelected = false
button.setTitleColor(UIColor.green, for: UIControl.State.normal)
button.backgroundColor = UIColor.blue
}
}
It sounds to me like UISwitch is what you're looking for. Give it a try instead of wasting time implementing something that's already there for you.
try this
#IBAction func btn1Pressed(sender: UIButton) {
if sender.selected {
sender.selected = false
sender.setTitleColor(UIColor.redColor(), forState: .Normal)
sender.backgroundColor = UIColor.blackColor()
}
else {
sender.selected = true
sender.setTitleColor(UIColor.redColor(), forState: .Selected)
sender.backgroundColor = UIColor.blackColor()
}
}
Change background color of selected button from storyboard like below in state config choose selected and then change background color and also coustomize default for normal button.
and use below in action
(sender as! UIButton).selected = !(sender as! UIButton).selected
Please try this code first you need to crate action and propert of the button like
#IBOutlet var btn_ButtonPressed: UIButton!
then Action.
#IBAction func click_ButtonPressed(_ sender: Any) {
if !sender.isSelected() {
sender.selected = true
btn_ButtonPressed.setTitleColor(UIColor.red, forState: .normal)
btn_ButtonPressed.backgroundColor = UIColor.yellow
}
else {
sender.selected = false
btn_ButtonPressed.setTitleColor(UIColor.yellow, forState: .normal)
btn_ButtonPressed.backgroundColor = UIColor.red
}
}
this one worked fine for me!
//
#IBAction func buttonColorChanger(sender : UIButton ) {
if button.isSelected == false
{
button.backgroundColor = UIColor.purple
print("selected")
button.setTitle("selected", for: .normal)
button.setTitleColor(UIColor.white, for: .normal)
button.isSelected = true
}else{
button.backgroundColor = UIColor.white
print("unselected")
button.isSelected = false
}
}
A cleaner approach would be:
#objc private func buttonTapped(_ sender: UIButton) {
sender.isSelected.toggle()
if selected {
// Setup appearance for selected state.
} else {
// Setup appearance for deselected state.
}
}
I'm going to implement a check box like this:
by
class CheckBox: UIButton {
let checkedImage = UIImage(named: "checked")
let uncheckedImage = UIImage(named: "unchecked")
var checked : Bool = false{
didSet{
if checked == false{
self.setImage(uncheckedImage, forState: .Normal)
}else {
self.setImage(checkedImage, forState: .Normal)
}
}
}
override func awakeFromNib() {
self.addTarget(self, action: "buttonClicked:", forControlEvents: .TouchUpInside)
checked = false
}
func buttonClicked(sender: UIButton){
if (sender == self){
checked = !checked
}
}
}
but everything I got is:
Could you explain what happened?
i tried your code it's works fine i only changed this part self.addTarget... to:
self.addTarget(self, action: #selector(CheckBox.buttonClicked(_:)), forControlEvents: .TouchUpInside)
and when you create the button change it class to: CheckBox
Call self.setNeedsLayout() at the end of your didSet statement.
If you change any of subviews you need to ask it to update it's layout and children. Let me know if that helped.
My UIButton is in a UICollectionviewcell, which is in a UICollectionview, which is in a UITableViewCell, which is in a UITableView.
The button is a like button, I want it to change its text when clicked. But after changing the text, it returns the original value. What might be the reason here?
Here is what it looks like:
https://gfycat.com/UnlawfulGroundedErin
This is the onClickEvent of button:
#IBAction func actionClick(sender: MyActionButton) {
if (sender.toggle){
print("Do dislike call here.")
sender.toggle = false
sender.titleLabel?.text = "Like"
}else{
print("Do like call here.")
sender.toggle = true
sender.titleLabel?.text = "Unlike"
}
}
Try This. It will work properly
#IBAction func actionClick(sender: MyActionButton) {
if (sender.toggle){
print("Do dislike call here.")
sender.toggle = false
sender.titleLabel?.text = "Like"
sender.setTitle("Like", forState: UIControlState.Normal)
}else{
print("Do like call here.")
sender.toggle = true
sender.setTitle("Unlike", forState: UIControlState.Normal)
}
}
UIButton have different texts for its title in different states.
Just for your knowledge
In viewDidLoad:
btnObject.setTitle("Like", forState: UIControlState.Normal)
btnObject.setTitle("Unlike", forState: UIControlState.Selected)
then in method actionClick: if you write only one statement,
sender.selected = !sender.selected;
it will work.
try this
#IBAction func actionClick(sender: UIButton) {
if sender.isSelected() {
sender.selected = false
sender.setTitle("Like", forState: UIControlState.Normal)
}
else {
sender.selected = true
sender.setTitle("Unlike", forState: UIControlState.Normal)
}
}
Choice-2
var isSelectFirst:Bool = false
#IBAction func actionClick(sender: UIButton) {
if isHighLighted == false{
sender.setTitle("Unlike", forState: UIControlState.Normal)
isHighLighted = true
}else{
sender.setTitle("Like", forState: UIControlState.Normal)
isHighLighted = false
}
}
I have written a subclass that selects and deselects buttons. I have put this subclass on around 5 buttons in a View Controller.
I want to amend the code so that if the user selects one and then selects another the first one gets deselected.
I was thinking of using the .tag on the button to count which buttons has been selected and remove the selection when the next button is pressed.
Here is the code :
thanks
class ChangeColour: UIButton {
var buttontagpressed: Int = 0
var isChecked:Bool = false{
didSet{
if isChecked == true {
self.backgroundColor = UIColor(red:0.27, green:0.29, blue:0.31, alpha:1.0)
self.setTitleColor(UIColor.whiteColor(), forState: .Normal)
buttontagpressed = self.tag
}
else
{
self.backgroundColor = UIColor(red:0.09, green:0.83, blue:0.56, alpha:1.0)
self.setTitleColor(UIColor(red:0.24, green:0.24, blue:0.24, alpha:1.0), forState: .Normal)
}
}
}
override func awakeFromNib() {
self.addTarget(self, action: "buttonselected:", forControlEvents: UIControlEvents.TouchUpInside)
self.isChecked = false
}
func buttonselected (sender:UIButton) {
buttontagpressed = self.tag
if (sender == self)
{
if isChecked == true
{
isChecked = false
}
else
{
isChecked = true
}
}
}
}
Rather than using tag (which I think is quite an ugly solution) I would be inclined to add a property to your class which keeps a reference of the previously selected button. This solution would be much more elegant - Or you could use UINotificationCenter to broadcast a message to all buttons to initiate the deselect.