VC with UISlider to change textfield on VC2 - ios

Question

I have a View controller that has a tableView embedded in a ContainerView and just below the ContainerView I have a UISlider. I have code on a view controller for the UISlider and code on another view controller that controls the table view.
Properties of the UISlider are set based on the selected text field - this section of code works. I am struggling to create a function/feature that will change the textField value when the UISlider is move. I think the UISlider Action needs to on the code that controls the UISlider, but I cannot determine how to cast the value of the UISlider.setvalue between the two viewController as the slider is moved to update the textField located in a tableCell. Hopefully makes some sense.
// UISlider ViewController
override func viewDidLoad() {
super.viewDidLoad()
sliderOutlet.isContinuous = true
sliderOutlet.tintColor = UIColor.green
self.refreshSlider()
}
#objc func refreshSlider() {
sliderOutlet.minimumValue = Float(GlobalSliderValues.minimumValue)
sliderOutlet.maximumValue = Float(GlobalSliderValues.maximumValue)
sliderOutlet.value = Float(GlobalSliderValues.sliderValue)
// if let chgIntValue = Int(GlobalSliderValues.changeValue)
// { sliderOutlet.setValue(Float(Double(chgIntValue)), animated: true)
// }
}
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
NotificationCenter.default.addObserver(self, selector: #selector(self.refreshSlider), name: Notification.Name("refreshSlider"), object: nil)
}
override func viewDidDisappear(_ animated: Bool) {
super.viewDidDisappear(animated)
NotificationCenter.default.removeObserver(self, name: Notification.Name("refreshSlider"), object: nil)
}
TableView Controller
override func viewDidLoad() {
super.viewDidLoad()
mortgageAmount.addTarget(self, action: #selector(chgTextFieldDidChange(textField:)), for: UIControlEvents.editingChanged)
}
#objc func chgTextFieldDidChange(textField: UITextField)
{
if let chgStringValue = mortgageAmount.text
{
if Double(chgStringValue) ?? 1 > 10000 {
let alert = UIAlertController(title: "Input Error", message: "Value cannot be greater than 10000", preferredStyle: .alert)
alert.addAction(UIAlertAction(title: "Ok", style: .default, handler: nil))
self.present(alert, animated: true, completion: nil)
return
}
GlobalSliderValues.minimumValue = 10
GlobalSliderValues.maximumValue = 10000
GlobalSliderValues.sliderValue = Int(mortgageAmount.text!)!
GlobalSliderValues.mortageAmountValue = Float(Int(mortgageAmount.text!)!)
NotificationCenter.default.post(name:Notification.Name("refreshSlider"), object: nil)
if let chgIntValue = Int(chgStringValue)
{ GlobalSliderValues.changeValue.setValue(Float(Double(chgIntValue)), animated: true)
}
}
}
#IBAction func valueChanged(_ sender: UISlider) {
mortgageAmount.text = String(format: "%.2f",Double(sender.value))
}
struct GlobalSliderValues {
static var minimumValue = Int()
static var maximumValue = Int()
static var lowerValue = Int()
static var UpperValue = Int()
static var locationValue = Int()
static var sliderValue = Int()
static var sliderChgValue = ""
}

Answer 1

We don't need notification center to deal with refreshing the slider. Since we are using constants to store value your code can be changed as follows
class ViewController: UIViewController {
#IBOutlet weak var sliderOutlet: UISlider!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
sliderOutlet.isContinuous = true
sliderOutlet.tintColor = UIColor.green
}
#objc func refreshSlider() {
DispatchQueue.main.async {
self.sliderOutlet.minimumValue = Float(GlobalSliderValues.minimumValue)
self.sliderOutlet.maximumValue = Float(GlobalSliderValues.maximumValue)
self.sliderOutlet.value = Float(GlobalSliderValues.sliderValue)
print(self.sliderOutlet.minimumValue)
print(self.sliderOutlet.maximumValue)
print(self.sliderOutlet.value)
}
}
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
self.refreshSlider()
}
}
I entered mortgage amount as so 1098 so slider look like below