我出于某种原因不断收到此错误。
"type" viewController does not conform to protocol "UITableViewDataSource"
我知道这已被覆盖了一百万次，甚至还有视频解释了为什么会出现这个问题，但由于某种原因我无法修复它，也无法弄清楚我做错了什么。
这是我的代码：
//
// ViewController.swift
// ChatApp
//
// Created by K on 17/03/2015.
// Copyright (c) 2015 Krazy88 All rights reserved.
//
import UIKit
class ViewController: UIViewController, UITableViewDelegate, UITableViewDataSource, UITextFieldDelegate {
@IBOutlet weak var dockViewHeightConstraint: NSLayoutConstraint!
@IBOutlet weak var sendButton: UIButton!
@IBOutlet weak var messageTextField: UITextField!
@IBOutlet weak var messageTableView: UITableView!
var messagesArray:[String] = [String]()
var delegate: UITableViewDataSource? = nil
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
self.messageTableView.delegate = self
self.messageTableView.dataSource = self
// Set self as the delegate for the textfield
self.messageTextField.delegate = self
//Add a tap gesture recognizer to the tableview
let tapGesture:UITapGestureRecognizer = UITapGestureRecognizer(target:self, action: "tableViewTapped")
self.messageTableView.addGestureRecognizer(tapGesture)
// Retrieve messages from Parse
self.retreiveMessages()
}
override func didReceiveMemoryWarning(){
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
@IBAction func sendButtonTapped(sender: UIButton) {
// Send button is tapped
// Call the end editing method for the text field
self.messageTextField.endEditing(true)
//Disable the send button and textfield
self.messageTextField.enabled = false
self.sendButton.enabled = false
// Create a PFObject
var newMessageObject:PFObject = PFObject(className: "Message")
// Set the Text key to the text of the messageTextField
newMessageObject["Text"] = self.messageTextField.text
// Save the PFObject
newMessageObject.saveInBackgroundWithBlock { (success:Bool, error:NSError!) -> Void in
if (success == true) {
//Message has been saved!
// TODO: Retrieve the latest messages and reload the table
NSLog("Message saved successfully.")
}
else {
// Something bad happened.
NSLog(error.description)
}
// Enable the textfield and send button
self.sendButton.enabled = true
self.messageTextField.enabled = true
self.messageTextField.text = ""
}
}
func retreiveMessages() {
// Create a new PFQuery
var query:PFQuery = PFQuery(className: "Message")
// Call findobjectsinbackground
query.findObjectsInBackgroundWithBlock { (objects:[AnyObject]!, error:NSError!) -> Void in
// clear the messageArray
self.messagesArray = [String]()
// Loop through the objects array
for messageObject in objects {
// Retrieve the Text column of each PFObject
let messageText:String? = (messageObject as PFObject)["Text"] as? String
// Assign it into our messagesArray
if messageText != nil {
self.messagesArray.append(messageText!)
}
}
// Reload the tableview
self.messageTableView.reloadData()
// Reload the tableview
}
func tableViewTapped() {
// Force the textfield to end editing
self.messageTextField.endEditing(true)
}
// MARK: Textfield Delegate Methods
func textFieldDidBeginEditing(textField: UITextField) {
// Perform an animation to grow the dockview
self.view.layoutIfNeeded()
UIView.animateWithDuration(0.5, animations: {
self.dockViewHeightConstraint.constant = 350
self.view.layoutIfNeeded()
} , completion: nil)
}
func textFieldDidEndEditing(textField:UITextField) {
// Perform an animation to grow the dockview
self.view.layoutIfNeeded()
UIView.animateWithDuration(0.5, animations: {
self.dockViewHeightConstraint.constant = 60
self.view.layoutIfNeeded()
}, completion: nil)
}
// MARK: TableView Delegate Methods
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
// Create a table cell
let cell = self.messageTableView.dequeueReusableCellWithIdentifier("MessageCell") as UITableViewCell
// Customize the cell
cell.textLabel.text = self.messagesArray[indexPath.row]
//Return the cell
return cell
}
func TableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return messagesArray.count
}
}
}
任何帮助提示或建议将非常感激，因为我已经尝试了一切！
感谢阅读
Kurando
答案 0 :(得分：1)
您的UITableViewDataSource @required委托位于retreiveMessages（）内。修复第二个最后一个括号的位置.. !!
这是您正确的代码：
import Foundation
import UIKit
class ViewController : UIViewController, UITableViewDataSource, UITableViewDelegate, UITextFieldDelegate {
@IBOutlet weak var dockViewHeightConstraint: NSLayoutConstraint!
@IBOutlet weak var sendButton: UIButton!
@IBOutlet weak var messageTextField: UITextField!
@IBOutlet weak var messageTableView: UITableView!
var messagesArray:[String] = [String]()
var delegate: UITableViewDataSource? = nil
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
messageTableView.delegate = self
messageTableView.dataSource = self
// Set self as the delegate for the textfield
self.messageTextField.delegate = self
//Add a tap gesture recognizer to the tableview
let tapGesture:UITapGestureRecognizer = UITapGestureRecognizer(target:self, action: "tableViewTapped")
self.messageTableView.addGestureRecognizer(tapGesture)
// Retrieve messages from Parse
self.retreiveMessages()
}
override func didReceiveMemoryWarning(){
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
@IBAction func sendButtonTapped(sender: UIButton) {
// Send button is tapped
// Call the end editing method for the text field
self.messageTextField.endEditing(true)
//Disable the send button and textfield
self.messageTextField.enabled = false
self.sendButton.enabled = false
// Create a PFObject
var newMessageObject:PFObject = PFObject(className: "Message")
// Set the Text key to the text of the messageTextField
newMessageObject["Text"] = self.messageTextField.text
// Save the PFObject
newMessageObject.saveInBackgroundWithBlock { (success:Bool, error:NSError!) -> Void in
if (success == true) {
//Message has been saved!
// TODO: Retrieve the latest messages and reload the table
NSLog("Message saved successfully.")
}
else {
// Something bad happened.
NSLog(error.description)
}
// Enable the textfield and send button
self.sendButton.enabled = true
self.messageTextField.enabled = true
self.messageTextField.text = ""
}
}
func retreiveMessages() {
// Create a new PFQuery
var query:PFQuery = PFQuery(className: "Message")
// Call findobjectsinbackground
query.findObjectsInBackgroundWithBlock { (objects:[AnyObject]!, error:NSError!) -> Void in
// clear the messageArray
self.messagesArray = [String]()
// Loop through the objects array
for messageObject in objects {
// Retrieve the Text column of each PFObject
let messageText:String? = (messageObject as PFObject)["Text"] as? String
// Assign it into our messagesArray
if messageText != nil {
self.messagesArray.append(messageText!)
}
}
// Reload the tableview
self.messageTableView.reloadData()
// Reload the tableview
}
}
func tableViewTapped() {
// Force the textfield to end editing
self.messageTextField.endEditing(true)
}
// MARK: Textfield Delegate Methods
func textFieldDidBeginEditing(textField: UITextField) {
// Perform an animation to grow the dockview
self.view.layoutIfNeeded()
UIView.animateWithDuration(0.5, animations: {
self.dockViewHeightConstraint.constant = 350
self.view.layoutIfNeeded()
} , completion: nil)
}
func textFieldDidEndEditing(textField:UITextField) {
// Perform an animation to grow the dockview
self.view.layoutIfNeeded()
UIView.animateWithDuration(0.5, animations: {
self.dockViewHeightConstraint.constant = 60
self.view.layoutIfNeeded()
}, completion: nil)
}
// MARK: TableView Delegate Methods
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int
{
return messagesArray.count
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
// Create a table cell
let cell = self.messageTableView.dequeueReusableCellWithIdentifier("MessageCell") as UITableViewCell
// Customize the cell
cell.textLabel?.text = self.messagesArray[indexPath.row]
//Return the cell
return cell
}
}
从这里复制。
并始终确保在cellForRowAtIndexPath之前调用numberOfRowsInSection。