简单地说，如果在选项菜单/视图（未显示）中关闭语法选项，我试图在编辑模式下禁用语法选择按钮（submitButton）。运行时，该按钮显示为已禁用，但如果您触摸该按钮则显示以下错误：
[UITextView edit]：无法识别的选择器发送到实例0x7fc0ff001e00
这让我很难过。我浏览了互联网，但我没有找到任何有用的东西。我只有两个对该按钮的引用。 IBAction和IBOutlet。
我确信它很简单。感觉像这样。 ：P
请原谅凌乱的代码（也大幅减少）：
编辑：添加了一些可能相关的功能。
import UIKit
import AFNetworking
import Highlightr
class PasteView: UIViewController, UITextViewDelegate, UIGestureRecognizerDelegate {
var isCurrentlyEditing = false;
// Previous pastes array
var savedList: [String] = []
var submitButtonState: Bool = true
let highlightr = Highlightr()
var syntaxIndex: Int = 0
var syntaxPastebin: String = "Syntax"
var syntaxHighlightr: String = ""
var languages = ["C", "BASIC", "Java", "JavaScript", "Kotlin", "Swift"]
override func viewDidLoad() {
super.viewDidLoad()
//Don't judge for the following code - fairly redundant but works
let tapOutTextField: UITapGestureRecognizer = UITapGestureRecognizer(target: textView, action: #selector(edit));
textView.delegate = self;
textView.addGestureRecognizer(tapOutTextField);
view.addGestureRecognizer(tapOutTextField)
// Load previous pastes to savedList array
loadSavedListItems()
// Sets the theme of syntax highlighter. Could be made a choice in the future in Options menu.
highlightr?.setTheme(to: "github-gist")
// Picks up the default syntax/language that was set in options menu/view
let defaults = UserDefaults.standard
syntaxIndex = defaults.integer(forKey: "selectedText")
syntaxPastebin = languages[defaults.integer(forKey: "selectedText")]
syntaxHighlightr = langMap[syntaxPastebin]!
}
@IBOutlet weak var titleText: UITextField!
@IBAction func editAction(_ sender: Any) {
titleText.text = "";
}
@IBOutlet weak var submitButton: UIBarButtonItem!
@IBOutlet weak var doneButton: UIBarButtonItem!
@IBAction func done(_ sender: Any) {
if (!isCurrentlyEditing) {
if (textView.text?.isEmpty)! {
let mainStoryboard = UIStoryboard(name: "Main", bundle: nil);
let vC: ViewController = mainStoryboard.instantiateViewController(withIdentifier: "mainView") as! ViewController;
self.present(vC, animated: false, completion: nil);
} else {
let alertController = UIAlertController(title: "Are you sure?", message: "You'll lose all text currently in the editor", preferredStyle: .alert)
let OKAction = UIAlertAction(title: "Yes", style: .default) { (action) in
let mainStoryboard = UIStoryboard(name: "Main", bundle: nil);
let vC: ViewController = mainStoryboard.instantiateViewController(withIdentifier: "mainView") as! ViewController;
self.present(vC, animated: false, completion: nil);
}
alertController.addAction(OKAction)
let NoActions = UIAlertAction(title: "Cancel", style: .default) { (action) in
}
alertController.addAction(NoActions)
self.present(alertController, animated: true) {
}
}
} else {
isCurrentlyEditing = false;
doneButton.title = "Back";
view.endEditing(true);
submitButton.isEnabled = true
submitButtonState = true;
submitButton.title = "Submit";
// Converts pasted/typed text into highlighted syntax if selected in options menu
let defaults = UserDefaults.standard
if (defaults.object(forKey: "SyntaxState") != nil && defaults.bool(forKey: "SyntaxState") == true) {
let code = textView.text
if syntaxHighlightr == "default" {
textView.attributedText = highlightr?.highlight(code!)
} else if syntaxHighlightr == "none" {
textView.attributedText = NSAttributedString(string: code!)
} else {
textView.attributedText = highlightr?.highlight(code!, as: syntaxHighlightr)
}
}
}
}
@objc func edit() {
isCurrentlyEditing = true
submitButtonState = false
let defaults = UserDefaults.standard
if (defaults.bool(forKey: "SyntaxState") == true) {
submitButton.title = syntaxPastebin
} else {
submitButton.isEnabled = false
}
doneButton.title = "Done"
}
@IBOutlet weak var textView: UITextView!
@IBAction func submit(_ sender: UIBarButtonItem!) {
if submitButton.isEnabled {
if submitButtonState {
let text = textView.text;
if (text?.isEmpty)! {
let alertController = UIAlertController(title: "Error!", message: "Text cannot be empty!", preferredStyle: .alert)
let OKAction = UIAlertAction(title: "OK", style: .default) { (action) in
// handle response here.
}
alertController.addAction(OKAction)
self.present(alertController, animated: true) {
}
} else {
if (isInternetAvailable()) {
// Check if internet is available and then handles and submits API
} else {
let alertController = UIAlertController(title: "Error!", message: "Not connected to the internet!", preferredStyle: .alert)
let OKAction = UIAlertAction(title: "OK", style: .default) { (action) in
// handle response here.
}
alertController.addAction(OKAction)
self.present(alertController, animated: true) {
}
}
}
} else {
// Pops up syntax selector popup if in Editing State
selectSyntax()
}
}
}
// Syntax picker method with segue via code
func selectSyntax() {
let sb = UIStoryboard(name: "SyntaxSelectViewController", bundle: nil)
let popup = sb.instantiateInitialViewController()! as! SyntaxSelectViewController
popup.syntax = syntaxPastebin
popup.syntaxIndex = syntaxIndex
present(popup, animated: true)
// Callback closure to fetch data from popup
popup.onSave = { (data, index) in
self.syntaxHighlightr = self.langMap[data]!
self.syntaxIndex = index
self.syntaxPastebin = data
self.submitButton.title = self.syntaxPastebin
}
}
func textViewDidBeginEditing(_ textView: UITextView) {
edit();
}
func textViewDidChange(_ textView: UITextView) {
isCurrentlyEditing = true
submitButtonState = false
let defaults = UserDefaults.standard
if (defaults.bool(forKey: "SyntaxState") == true) {
submitButton.title = syntaxPastebin
} else {
submitButton.isEnabled = false
}
doneButton.title = "Done"
}
func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWith otherGestureRecognizer: UIGestureRecognizer) -> Bool {
return true
}
let langMap = ["C": "cpp", "BASIC": "basic", "Java": "java", "JavaScript": "javascript", "Kotlin": "kotlin", "Swift": "swift"]
答案 0 :(得分：1)
您已将textView指定为点按手势识别器的目标，实际上应该是self（因为edit功能已在您的{PasteView中定义1}}类，而不是UITextView）。所以这个：
UITapGestureRecognizer(target: textView, action: #selector(edit))
......应该是这样的：
UITapGestureRecognizer(target: self, action: #selector(edit))