I want to change the label in my header to correlate with my UISwitch
though I have have no success as yet?
setLeftNavButton() is called in viewDidLoad()
func setLeftNavButton() {
let switchControl=UISwitch()
//switchControl.isOn = true
//switchControl.setOn(true, animated: false)
switchControl.addTarget(self, action: #selector(switchValueDidChange), for: .valueChanged)
self.navigationItem.leftBarButtonItem = UIBarButtonItem.init(customView: switchControl)
self.switchControl = switchControl
}
var switchControl: UISwitch?
func switchValueDidChange(){
guard let mySwitch = switchControl else { return }
if mySwitch.isOn {
header?.onlineOfflineStatusLabel.text = "on"
}
else {
header?.onlineOfflineStatusLabel.text = "off"
}
self.header?.reloadInputViews()
self.collectionView?.reloadData()
}
try this:
func setLeftNavButton() {
let switchControl = UISwitch()
switchControl.addTarget(self, action: #selector(switchValueDidChange(_:)), for: .valueChanged)
self.navigationItem.leftBarButtonItem = UIBarButtonItem.init(customView: switchControl)
self.switchControl = switchControl
}
#objc
func switchValueDidChange(_ sender: UISwitch){
if sender.isOn {
header?.onlineOfflineStatusLabel.text = "on"
} else {
header?.onlineOfflineStatusLabel.text = "off"
}
self.header?.reloadInputViews()
self.collectionView?.reloadData()
}
Related
By pressing a button in my app, the value of a variable falls by 3. While this happens without any issues, the label which uses string interpolation to show that variable as its text (label.text) does not reflect the change.
How can I make it so pressing the button changes the value of the UILabel?
import UIKit
class ViewController: UIViewController {
var token = 5
let theButton: UIButton = {
let button = UIButton(type: .system)
button.setTitle("button", for: .normal)
button.backgroundColor = .systemPink
button.addTarget(self, action: #selector(theButtonPressed), for: .touchUpInside)
button.translatesAutoresizingMaskIntoConstraints = false
return button
}()
#objc func theButtonPressed() {
if token >= 3 {
token -= 3
print("ok done")
} else {
print("nope")
}
}
lazy var tokenLabel: UILabel = {
let label = UILabel()
label.text = "\(token)"
label.translatesAutoresizingMaskIntoConstraints = false
return label
}()
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = .systemBlue
view.addSubview(tokenLabel)
view.addSubview(theButton)
theButton.heightAnchor.constraint(equalToConstant: 100).isActive = true
theButton.widthAnchor.constraint(equalToConstant: 200).isActive = true
theButton.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
theButton.centerYAnchor.constraint(equalTo: view.centerYAnchor).isActive = true
tokenLabel.centerYAnchor.constraint(equalTo: view.centerYAnchor, constant: 60).isActive = true
tokenLabel.heightAnchor.constraint(equalToConstant: 300).isActive = true
tokenLabel.widthAnchor.constraint(equalToConstant: 200).isActive = true
tokenLabel.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
}
}
You need to update the label's text when the button is pressed.
#objc func theButtonPressed() {
if token >= 3 {
token -= 3
print("ok done")
tokenLabel.text = "\(token)" // <- update
} else {
print("nope")
}
}
Or, you can observe the property token and change the label when a new value is set.
var token = 5 {
didSet {
tokenLabel.text = "\(token)"
}
}
#objc func theButtonPressed() {
if token >= 3 {
token -= 3
print("ok done")
} else {
print("nope")
}
}
I solved the problem
override func viewDidLoad() {
super.viewDidLoad()
let save = UserDefaults.standard.bool(forKey: "RememberMe")
self.circleBox.isChecked = save
}
#objc func checkboxvalue(sender: Checkbox) {
if sender.isChecked == true {
labelcheckbox.text = ("Beni")
action((Any).self)
UserDefaults.standard.set(true, forKey:"RememberMe");
}else{
labelcheckbox.text = ("")
UserDefaults.standard.set(false, forKey:"RememberMe");
}
}
I've designed a recall checkbox. But when I log out of the application, I want the checkbox value to be set to UserDefaults as true or false. So I want the checkbox to remember true or false when I get into the application.
lazy var circleBox: Checkbox = {
let squareBox = Checkbox(frame: CGRect(x: 22, y: 290, width: 25, height: 25))
squareBox.tintColor = .black
squareBox.borderStyle = .square
squareBox.checkmarkStyle = .square
squareBox.uncheckedBorderColor = .lightGray
squareBox.borderWidth = 1
squareBox.addTarget(self, action: #selector(checkboxvalue(sender:)), for: .valueChanged)
return squareBox
}()
#objc func checkboxvalue(sender: Checkbox) {
if sender.isChecked == true {
labelcheckbox.text = ("Remember me")
action((Any).self)
}else{
labelcheckbox.text = ("Don't remember")
}
}
I'm subclassing a UITextfield in order to create a overlay button to the right which will toggle the isSecureTextEntry boolean. Typically when creating IBActions in storyboard the boolean is determined based on the sender which I'd implement in Objective-C code like this:
-(IBAction)showPasswordTapped:(UIButton *)sender{
sender.selected = !sender.selected;
self.passwordField.secureTextEntry = !sender.selected;
}
However, now that I'm subclassing I was thinking of using an if else statement but the logic looked as if it would just set the boolean back to true. What would be the appropriate conditional statement if I don't have access to sender?
Here is my subclass in Swift:
class SecurePasswordUITextField : UITextField {
override func awakeFromNib() {
super.awakeFromNib()
self.isSecureTextEntry = true
var overlayButton = UIButton.init(type: UIButtonType.custom)
overlayButton.titleLabel = "Show"
overlayButton.addTarget(self, action: #selector(showSecureCharacters), for: .touchUpInside)
overlayButton = CGRect.init(x: self.bounds.origin.x, y: self.bounds.origin.y, width: 28, height: 28)
self.rightView = overlayButton
self.rightViewMode = UITextFieldViewMode.always
}
func showSecureCharacters(){
if self.isSecureTextEntry {
self.isSecureTextEntry = false
} else {
self.isSecureTextEntry = true
}
if !self.isSecureTextEntry{
self.isSecureTextEntry = true
} else {
self.isSecureTextEntry = false
}
}
}
You can access the sender
overlayButton.addTarget(self, action: #selector(showSecureCharacters(_:)), for: .touchUpInside)
//
#objc func showSecureCharacters(_ sender:UIButton){ --- }
Also this is sufficient
self.isSecureTextEntry = !self.isSecureTextEntry
I have a tableView that has a UISwitch in it I am using notificationCenter to get the row of the UISwitch. How do I now use that info to turn off every other switch except the switch that I clicked?
func creatNotification() {
let switchNotification = Notification.Name("answer")
NotificationCenter.default.addObserver(self,selector: #selector(getSwitchRow),name:switchNotification, object:nil)
}
#objc func getSwitchRow(notification: NSNotification){
rowNumber = notification.object as! Int
print("dataView2, getSwitchRow, rowNumber:", rowNumber)
}
#IBAction func `switch`(_ sender: UISwitch) {
var dataViewObject = DataView2()
dataViewObject.creatNotification()
let switchNotification = Notification.Name("answer")
NotificationCenter.default.post(name: switchNotification, object: rowNumber)
let switchNotification2 = Notification.Name("switch")
NotificationCenter.default.post(name: switchNotification, object: answerSwitch.isOn)
if(answerSwitch.isOn == true){
}
}
you can define an attribute : var previousSwitch: UISwitch?
Then the Selector :
#objc func setOn(sender: UISwitch,indexPath: IndexPath){
if previousSwitch != nil {
previousSwitch?.isOn = false
}
let sw = sender
let isSetOn = sw.isOn
if (isSetOn){
print("on")
}else{
print("off")
}
previousSwitch = sw
}
and in Cell :
sw.addTarget(self, action: #selector(setOn(sender:indexPath:)), for: .valueChanged)
cell?.contentView.addSubview(sw)
How to save On-Off value of a button? I have a On-Off button, when a user opens the app and click the Off button, I want the app to save it, so that when the app is reopened, the value of the button is still Off. Hopefully, this can be done by using User Defaults. My code:
class ViewController: UIViewController {
var soundEnable:Bool = true
var soundImage:UIImage?
#IBAction func soundbtn(_ sender: UIButton) {
let soundButton = sender
if (soundEnable) {
soundImage = UIImage.init(named: "mute.png")
soundEnable = false
} else {
soundImage = UIImage.init(named: "sound.png")
soundEnable = true
}
soundButton.setImage(soundImage, for: UIControlState.normal)
}
}
You need to set the image one more place at viewDidLoad.
You input the wrong parameter for setImage:
soundButton.setImage(soundImage, for: UIControlState())
it should be a specific state:
soundButton.setImage(soundImage, for: UIControlState.normal)
Please write these lines in viewDidLoad method
override func viewDidLoad() {
super.viewDidLoad()
if (UserDefaultsManager.useDarkTheme) {
soundImage = UIImage.init(named: "mute")
print(UserDefaultsManager.useDarkTheme)
} else {
soundImage = UIImage.init(named: "sound")
print(UserDefaultsManager.useDarkTheme)
}
}
#IBOutlet weak var backgroundImage: UIImageView!
let ImageNameKey = "ImageNameKey"
let soundbg = UIImage(named: "sound")
let mutebg = UIImage(named: "mute")
override func viewDidLoad() {
super.viewDidLoad()
//Sound.play(file: "bg", fileExtension: "wav", numberOfLoops: -1)
let defaults = UserDefaults.standard
if let name = defaults.string(forKey: ImageNameKey) {
if (name == "sound") {
backgroundImage.image = soundbg
} else {
backgroundImage.image = mutebg
}
}
}
#IBAction func clickbtn(_ sender: UIButton) {
let defaults = UserDefaults.standard
if(backgroundImage.image == soundbg){
backgroundImage.image = mutebg
defaults.set("mute", forKey: ImageNameKey)
Sound.enabled = false
}
else{
backgroundImage.image = soundbg
defaults.set("sound", forKey: ImageNameKey)
Sound.enabled = true
}
}