01-PrintConfigViewController.swift

//
//  PrintConfigViewController.swift
//  Fobo
//
//  Created by Lacy Rhoades on 8/24/18.
//

import UIKit

protocol PrintConfigViewControllerDelegate: class {
    func printConfigDidCancel()
    func save(printConfig: PrintConfig)
}

class PrintConfigViewController: UINavigationController {
    var settingsDelegate: PrintConfigViewControllerDelegate?
    
    var form: PrintConfigFormViewController
    init(_ config: PrintConfig) {
        form = PrintConfigFormViewController(config)
        
        super.init(nibName: nil, bundle: nil)
        
        form.navigationItem.rightBarButtonItem = UIBarButtonItem(barButtonSystemItem: .save, target: self, action: #selector(didTapDone))
        form.navigationItem.leftBarButtonItem = UIBarButtonItem(barButtonSystemItem: .cancel, target: self, action: #selector(didTapCancel))
        
        self.viewControllers = [form]
    }
    
    override init(nibName nibNameOrNil: String?, bundle nibBundleOrNil: Bundle?) {
        fatalError("Use init(config:)")
    }
    
    required init?(coder aDecoder: NSCoder) {
        fatalError("Use init(config:)")
    }
    
    @objc func didTapDone() {
        if let newValue = self.form.editedConfig {
            self.settingsDelegate?.save(printConfig: newValue)
        }
    }
    
    @objc func didTapCancel() {
        self.settingsDelegate?.printConfigDidCancel()
    }
}

extension PrintConfigViewController: InteriorPresentedVC {
    var sizeForPresentation: CGSize {
        return UIScreen.smallFormControllerSize
    }
}

02-PrintConfigFormViewController.swift

//
//  PrintConfigFormViewController.swift
//  Fobo
//
//  Created by Lacy Rhoades on 8/24/18.
//

import Eureka

class PrintConfigFormViewController: FormViewController {
    
    var config: PrintConfig
    
    init(_ config: PrintConfig) {
        self.config = config
        
        super.init(nibName: nil, bundle: nil)
        
        self.title = "Print Settings"
        
        form +++ Section() {
            section in
            } <<< SwitchRow("Enable") {
                row in
                row.title = "Enabled"
                row.value = self.config.isEnabled
                }
            <<< StepperRow("Quantity") {
                row in
                row.title = "Number of Prints"
                row.value = Double(self.config.quantity)
                row.displayValueFor = {
                    value in
                    return String(format: "%.0f", value ?? 1)
                }
                }.cellSetup({ (cell, row) in
                    cell.stepper.stepValue = 1
                    cell.stepper.minimumValue = 1
                    cell.stepper.maximumValue = 10
                })
            <<< PickerInlineRow<PrintMode>("Mode") {
                row in
                row.title = "Print Button"
                row.value = self.config.mode
                row.options = PrintMode.allValues
            }
            <<< PickerInlineRow<PaperSize>("Size") {
                row in
                row.title = "Paper Size (when available)"
                row.value = self.config.paperSize
                row.options = PaperSize.allValues
            }
    }
    
    override init(nibName nibNameOrNil: String?, bundle nibBundleOrNil: Bundle?) {
        fatalError("Nib init not allowed")
    }
    
    required init?(coder aDecoder: NSCoder) {
        fatalError("Coder init not allowed")
    }
    
    var editedConfig: PrintConfig? {
        let sizeRow = form.rowBy(tag: "Size") as? PickerInlineRow<PaperSize>
        let quantityRow = form.rowBy(tag: "Quantity") as? StepperRow
        let modeRow = form.rowBy(tag: "Mode") as? PickerInlineRow<PrintMode>
        
        guard let size: PaperSize = sizeRow?.value,
            let quantity: Double = quantityRow?.value,
            let mode: PrintMode = modeRow?.value else {
                return nil
        }
        
        return PrintConfig(paperSize: size, quantity: Int(quantity), mode: mode)
    }
}