Andrea Busi
116 lines
3.8 KiB
Swift
116 lines
3.8 KiB
Swift
//
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// EQNGenericPickerViewController.swift
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// Earthquake Network
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//
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// Created by Busi Andrea on 13/09/2020.
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// Copyright © 2020 Earthquake Network. All rights reserved.
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//
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import Foundation
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/// Protocollo per rappresentare elementi nel picker generico
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protocol PickerRepresentable {
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var pickerTitle: String { get }
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}
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class EQNGenericPickerViewController: UIViewController, UIPickerViewDelegate, UIPickerViewDataSource {
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typealias DoneCompletion = (PickerRepresentable) -> Void
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var onCompletion: DoneCompletion?
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var onCancel: (() -> Void)?
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// MARK: - Properties
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private var selectedIndex: Int?
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private var items = [PickerRepresentable]()
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private lazy var pickerView: UIPickerView = {
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let picker = UIPickerView(frame: .zero)
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picker.delegate = self
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picker.dataSource = self
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return picker
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}()
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private lazy var toolbar: UIToolbar = {
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let toolbar = UIToolbar()
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toolbar.barStyle = .default
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toolbar.isTranslucent = true
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let doneButton = UIBarButtonItem(barButtonSystemItem: .done, target: self, action: #selector(doneTapped(_:)))
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let spaceButton = UIBarButtonItem(barButtonSystemItem: .flexibleSpace, target: nil, action: nil)
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let cancelButton = UIBarButtonItem(barButtonSystemItem: .cancel, target: self, action: #selector(cancelTapped(_:)))
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toolbar.setItems([cancelButton, spaceButton, doneButton], animated: false)
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return toolbar
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}()
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// MARK: - View Lifecycle
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override func viewDidLoad() {
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super.viewDidLoad()
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view.backgroundColor = .clear
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toolbar.translatesAutoresizingMaskIntoConstraints = false
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pickerView.translatesAutoresizingMaskIntoConstraints = false
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view.addSubview(pickerView)
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view.addSubview(toolbar)
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pickerView.bottomAnchor.constraint(equalTo: view.safeAreaLayoutGuide.bottomAnchor).isActive = true
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pickerView.trailingAnchor.constraint(equalTo: view.trailingAnchor).isActive = true
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pickerView.leadingAnchor.constraint(equalTo: view.leadingAnchor).isActive = true
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toolbar.topAnchor.constraint(equalTo: view.topAnchor).isActive = true
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toolbar.trailingAnchor.constraint(equalTo: pickerView.trailingAnchor).isActive = true
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toolbar.leadingAnchor.constraint(equalTo: pickerView.leadingAnchor).isActive = true
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}
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// MARK: - Public
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public func configure(with items: [PickerRepresentable], selectedIndex: Int? = nil, completion: @escaping DoneCompletion) {
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self.onCompletion = completion
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self.items = items
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self.selectedIndex = items.count > 0 ? 1 : nil
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self.pickerView.reloadAllComponents()
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if let selectedIndex = selectedIndex, 0..<items.count ~= selectedIndex {
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self.selectedIndex = selectedIndex
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self.pickerView.selectRow(selectedIndex, inComponent: 0, animated: false)
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}
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}
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// MARK: - Actions
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@objc func doneTapped(_ sender: Any) {
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guard let index = selectedIndex else {
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return
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}
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onCompletion?(items[index])
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}
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@objc func cancelTapped(_ sender: Any) {
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onCancel?()
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}
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// MARK: - UIPickerViewDataSource
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func numberOfComponents(in pickerView: UIPickerView) -> Int {
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1
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}
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func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
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items.count
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}
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func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
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items[row].pickerTitle
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}
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// MARK: - UIPickerViewDataDelegate
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func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
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selectedIndex = row
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}
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}
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