PickerView

PickerView.swift

//How to implement ?

     let values = self.provinceList.compactMap{$0.name ?? ""}
        let picker = PickerManager(input: values, selected: values.first) { (value, index) in
            self.txtProvinces.text = value
            self.provinceID = self.provinceList[index].provinceID ?? 0
        }
        self.txtProvinces.inputView = picker
        
    
// Picker Manager
class PickerManager<T:Equatable>: UIView, UIPickerViewDelegate, UIPickerViewDataSource {
    
    private var inputArray = [T]()
    private var compilationHandler: ((T,Int) -> Void)?
    private var inputPickerView = UIPickerView()
    
    override init(frame:CGRect) {
        super.init(frame:frame)
    }
    
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    init(input:[T], selected:T? ,compilationHandler:@escaping (T,Int) -> Void) {
        super.init(frame: CGRect.zero)
        self.autoresizingMask = [.flexibleWidth, .flexibleHeight]
        //self.inputPickerView = UIPickerView(frame: CGRect.zero)
        self.inputPickerView.delegate = self
        self.inputPickerView.dataSource = self
        self.inputArray = input
        self.compilationHandler = compilationHandler
        if let value = selected {
             inputPickerView.reloadAllComponents()
             if input.count > 0 {
                 OperationQueue.current?.addOperation {
                    let index = input.firstIndex(of: value) ?? 0
                    self.inputPickerView.selectRow(index, inComponent: 0, animated: false)
                 }
             }
         }
        self.addSubview(self.inputPickerView)
    }
    

    //MARK: - Picker View deleage and dataSorce methods -
    func numberOfComponents(in pickerView: UIPickerView) -> Int {
        return 1
    }
    
    func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
        return self.inputArray.count
    }
    
    func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
        return "\(self.inputArray[row])"
     }
     
     func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
        
        if let returnValue = self.compilationHandler {
            returnValue(self.inputArray[row], row)
        }
     }

    
    // Only override draw() if you perform custom drawing.
    // An empty implementation adversely affects performance during animation.
    override func draw(_ rect: CGRect) {
        // Drawing code
        debugPrint(self.frame)
        debugPrint(self.frame.size)
        debugPrint(self.frame.origin)
        self.inputPickerView.frame = CGRect(x: 0, y: 0, width: self.frame.size.width, height: self.frame.size.height)
    }
    

}