Product-Calculator/Product Calculator/Constants/Extension.swift

//
//  Extension.swift
//  Product Calculator
//
//  Created by Suraj Kumar Mandal on 10/11/21.
//

import UIKit
import Foundation

extension UIView{
    func cardView() -> Void {
        self.layer.cornerRadius = 10
        self.layer.shadowColor = UIColor.gray.cgColor
        self.layer.shadowOffset = CGSize(width: 0.0, height: 0.0)
        self.layer.shadowRadius = 6.0
        self.layer.shadowOpacity = 0.5
    }
}

extension UITextField {
    func datePicker<T>(target: T,
                       doneAction: Selector,
                       cancelAction: Selector,
                       datePickerMode: UIDatePicker.Mode = .date) {
        let screenWidth = UIScreen.main.bounds.width
        
        func buttonItem(withSystemItemStyle style: UIBarButtonItem.SystemItem) -> UIBarButtonItem {
            let buttonTarget = style == .flexibleSpace ? nil : target
            let action: Selector? = {
                switch style {
                case .cancel:
                    return cancelAction
                case .done:
                    return doneAction
                default:
                    return nil
                }
            }()
            
            let barButtonItem = UIBarButtonItem(barButtonSystemItem: style,
                                                target: buttonTarget,
                                                action: action)
            
            return barButtonItem
        }
        
        let datePicker = UIDatePicker(frame: CGRect(x: 0,
                                                    y: 0,
                                                    width: screenWidth,
                                                    height: 216))
        datePicker.datePickerMode = datePickerMode
        //datePicker.maximumDate = Date()
        // iOS 14 and above
        if #available(iOS 14, *) {
            datePicker.preferredDatePickerStyle = .wheels
            datePicker.sizeToFit()
        }
        self.inputView = datePicker
        
        let toolBar = UIToolbar(frame: CGRect(x: 0,
                                              y: 0,
                                              width: screenWidth,
                                              height: 44))
        toolBar.setItems([buttonItem(withSystemItemStyle: .cancel),
                          buttonItem(withSystemItemStyle: .flexibleSpace),
                          buttonItem(withSystemItemStyle: .done)],
                         animated: true)
        self.inputAccessoryView = toolBar
    }
}

extension UIWindow {
    static var key: UIWindow? {
        if #available(iOS 13, *) {
            return UIApplication.shared.windows.first { $0.isKeyWindow }
        } else {
            return UIApplication.shared.keyWindow
        }
    }
}

extension UIViewController {
    func convertDateFormat(inputDate: String) -> String {
        let olDateFormatter = DateFormatter()
        olDateFormatter.dateFormat = "yyyy-MM-dd"
        let oldDate = olDateFormatter.date(from: inputDate)
        let convertDateFormatter = DateFormatter()
        convertDateFormatter.dateFormat = "dd/MM/yyyy"
        return convertDateFormatter.string(from: oldDate!)
    }
}

extension Date {
    init(dateString:String) {
        self = Date.iso8601Formatter.date(from: dateString)!
    }

    static let iso8601Formatter: ISO8601DateFormatter = {
        let formatter = ISO8601DateFormatter()
        formatter.formatOptions = [.withFullDate,
                                          .withTime,
                                          .withDashSeparatorInDate,
                                          .withColonSeparatorInTime]
        return formatter
    }()
}

extension String {
    func stringBefore(_ delimiter: Character) -> String {
        if let index = firstIndex(of: delimiter) {
            return String(prefix(upTo: index))
        } else {
            return ""
        }
    }
    
    func stringAfter(_ delimiter: Character) -> String {
        if let index = firstIndex(of: delimiter) {
            return String(suffix(from: index).dropFirst())
        } else {
            return ""
        }
    }
}