我有一個名為 ThemeVC 的類，它有一個文本視圖（與一個 IBoutlet 連接）和應用到它的功能（它有一個識別器來檢測被點擊的單詞）。
我的目標是我想提取那部分功能，并將其放在自己的類中或創建一個委托，以便我可以在其他文本視圖上重用該功能。
有誰知道怎么做？
我在下面粘貼了我的代碼。（這里的注釋，是應該從任何視圖控制器呼叫的函式）
import UIKit
class ThemeVC: UIViewController, UITextViewDelegate, UINavigationControllerDelegate {
@IBOutlet weak var themeTextView: UITextView!
var tB = UIBarButtonItem()
// Move away from ThemeVC ... ->
var selectionDict = [String:Int]()
var viewTagCount = Int()
var tap = UIGestureRecognizer()
var firstTimeGrouped = false
// -> ... Move away from ThemeVC
override func viewDidLoad() {
super.viewDidLoad()
themeTextView.delegate = self
loadbuttons ()
//HERE
addTagSelectorToolBar ()
}
func loadbuttons () {
tB = UIBarButtonItem(image: UIImage(systemName: "hand.point.up.left"), style: .plain, target: self, action: #selector(getTag(sender:)))
navigationItem.rightBarButtonItems = [tB]
}
@objc func getTag(sender: AnyObject) {
themeTextView.resignFirstResponder()
//HERE
startTagSelection()
}
}
// Move away from ThemeVC ... ->
extension ThemeVC {
func startTagSelection () {
navigationController?.setToolbarHidden(false, animated: false)
tap.isEnabled = true
tB.isEnabled = false
themeTextView.isEditable = false
themeTextView.isSelectable = false
}
}
extension ThemeVC {
@objc func doneTagSelection(){
navigationController?.setToolbarHidden(true, animated: false)
tap.isEnabled = false
tB.isEnabled = true
themeTextView.isEditable = true
themeTextView.isSelectable = true
firstTimeGrouped = false
}
}
extension ThemeVC {
func addTagSelectorToolBar (){
addTappedTagRecognizer()
tap.isEnabled = false
let done = UIBarButtonItem(barButtonSystemItem: .done, target: self, action: #selector(doneTagSelection))
let spacer = UIBarButtonItem(barButtonSystemItem: .flexibleSpace, target: self, action: nil)
toolbarItems = [spacer, done]
}
}
extension ThemeVC {
func addTappedTagRecognizer () {
tap = UITapGestureRecognizer(target: self, action: #selector(tapResponse(recognizer:)))
tap.delegate = self as? UIGestureRecognizerDelegate
themeTextView.addGestureRecognizer(tap)
}
@objc private func tapResponse(recognizer: UITapGestureRecognizer) {
let location: CGPoint = recognizer.location(in: themeTextView)
let position: CGPoint = CGPoint(x:location.x, y:location.y)
let tapPosition: UITextPosition? = themeTextView.closestPosition(to:position)
if tapPosition != nil {
let textRange: UITextRange? = themeTextView.tokenizer.rangeEnclosingPosition(tapPosition!, with: UITextGranularity.word, inDirection: UITextDirection(rawValue: 1))
if textRange != nil
{
let tappedWord: String? = themeTextView.text(in:textRange!)
print(tappedWord ?? "Unable to get word")
}
}
}
}
// ... -> Move away from ThemeVC
如何測驗我的代碼：
- 使用情節提要創建一個新專案
- 在左側用 themeVC 重命名 viewcontroller，并用我提供的代碼替換它的代碼。
- 在故事板上，將控制器嵌入到導航控制器中，在右側，將身份檢查器類從視圖控制器更改為 themeVC
- 添加一個文本視圖并將其鏈接到 IBoutlet
uj5u.com熱心網友回復：
看看你想從 ThemeVC 中移除的部分，我不得不說并不是所有的東西都應該從 ThemeVC 中移除。
例如，您標記startTagSelection為要移開的內容，但您參考了navigationController屬于視圖控制器的內容，因此理想情況下，UITextView 不應該負責更新您的 UINavigationBar。
所以評論中討論的兩個想法是使用子類和協議。
協議是建議的，Ptit Xav所以我將展示一種可以使用的方式，Ptit Xav如果有其他想法，可以添加答案。
我從創建協議開始
// Name the protocol as you see appropriate
// I add @objc so it can be accessible from Storyboard
// This will be used to `hand over` responsibility of
// a certain action / event
@objc
protocol CustomTextViewTagDelegate: class {
func customTextViewDidStartSelection(_ textView: CustomTextView)
func customTextViewDidFinishSelection(_ textView: CustomTextView)
}
接下來我繼承一個 UITextView 來添加我自己的自定義
@IBDesignable
class CustomTextView: UITextView {
var selectionDict = [String:Int]()
var viewTagCount = Int()
var tap = UIGestureRecognizer()
var firstTimeGrouped = false
// Name it as you wish
// @IBInspectable added for storyboard accessibility
// You could also make it an IBOutlet if your prefer
// that interaction
@IBInspectable
weak var tagDelegate: CustomTextViewTagDelegate?
func startTagSelection () {
// Remove the commented lines as this should the responsibility of
// the view controller, manage in the view controller using the delegate
// navigationController?.setToolbarHidden(false, animated: false)
// tB.isEnabled = false
tap.isEnabled = true
isEditable = false
isSelectable = false
// Hand over responsibility of this action back whatever
// has subscribed as the delegate to implement anything else
// for this action
tagDelegate?.customTextViewDidStartSelection(self)
}
func addTappedTagRecognizer () {
tap = UITapGestureRecognizer(target: self,
action: #selector(tapResponse(recognizer:)))
tap.delegate = self as? UIGestureRecognizerDelegate
addGestureRecognizer(tap)
}
@objc private func tapResponse(recognizer: UITapGestureRecognizer) {
let location: CGPoint = recognizer.location(in: self)
let position: CGPoint = CGPoint(x:location.x,
y: location.y)
let tapPosition: UITextPosition? = closestPosition(to:position)
if tapPosition != nil {
let textRange: UITextRange? = tokenizer.rangeEnclosingPosition(tapPosition!,
with: UITextGranularity.word,
inDirection: UITextDirection(rawValue: 1))
if textRange != nil
{
let tappedWord: String? = text(in:textRange!)
print(tappedWord ?? "Unable to get word")
}
}
}
@objc func doneTagSelection() {
// This is not the text view's responsibility, manage in the
// view controller using the delegate
// navigationController?.setToolbarHidden(true, animated: false)
// tB.isEnabled = true
tap.isEnabled = false
isEditable = true
isSelectable = true
firstTimeGrouped = false
// Hand over responsibility of this action back whatever
// has subscribed as the delegate to implement anything else
// for this action
tagDelegate?.customTextViewDidFinishSelection(self)
}
}
最后像這樣使用它
class ThemeVC: UIViewController {
// Change UITextView to CustomTextView
@IBOutlet weak var themeTextView: CustomTextView!
var tB = UIBarButtonItem()
// If you do not set up the delegate in your
// storyboard, you need to it in your code
// call this function from didLoad or something
// if needed
private func configureTextView() {
themeTextView.tagDelegate = self
}
// All your other implementation
}
extension ThemeVC: CustomTextViewTagDelegate {
func customTextViewDidStartSelection(_ textView: CustomTextView) {
navigationController?.setToolbarHidden(false,
animated: false)
tB.isEnabled = false
}
func customTextViewDidFinishSelection(_ textView: CustomTextView) {
navigationController?.setToolbarHidden(true,
animated: false)
tB.isEnabled = true
}
}
I did not add addTagSelectorToolBar as part of the CustomTextView implementation as this is not a good candidate to be part of that module as all of its code is related to the view controller so i don't recommend making a part of the CustomTextView implementation.
轉載請註明出處，本文鏈接：https://www.uj5u.com/shujuku/451002.html
上一篇：已發布的布爾變數自動重置