textView Swift的動態單元格高度

Question

我之前使用過標籤，它工作正常。但我只是意識到我需要一個UITextView，而我似乎無法讓它正常工作。

文本只是不斷去的權利，我再也看不到了。我需要它來調整它以前使用標籤工作的單元格的動態高度。

struct postStruct { 
    let username : String! 
    let message : String! 
    let photoURL : String! 
    let timeStamp: String! 
    let cellUserId : String! 
} 



class GeneralChatroom: UIViewController, UITableViewDataSource, UITableViewDelegate, UITextFieldDelegate { 

    @IBOutlet weak var messageTextField: UITextField! 
    @IBOutlet weak var tableView: UITableView! 

    var generalRoomDataArr = [postStruct]() 



    override func viewDidLoad() { 
     super.viewDidLoad() 



     //Key Board - self delegate for return key 
     messageTextField.delegate = self 

     //TableView Cell word wrap (Dynamic Text) 
     self.tableView.dataSource = self 
     self.tableView.delegate = self 
     self.tableView.estimatedRowHeight = 78 
     self.tableView.rowHeight = UITableViewAutomaticDimension 

     //Liquid Loader 
     let growColor = UIColor.red 
     let lineMatColor = UIColor(red: 11/255.0, green: 211/255.0, blue: 138/255.0, alpha: 1.0) 
     let lineMatFrame = CGRect(x: self.view.frame.width * 0.5 - 25, y: 500, width: 50, height: 50) 
     let lineMat = LiquidLoader(frame: lineMatFrame, effect: .Line(lineMatColor,4,1.0, growColor)) 

     //Placement of liquid Loader 
     let screenSize = UIScreen.main.bounds 
     let screenWidth = screenSize.width 
     // let screenHeight = screenSize.height 
     lineMat.frame = CGRect(x:screenWidth - 55 , y: 20, width:20 , height: 20) 
     view.addSubview(lineMat) 


     //Start Here 


     let ref = FIRDatabase.database().reference() 
     //let userID = FIRAuth.auth()?.currentUser?.uid 







     ref.child("general_room").queryOrderedByKey().observe(.childAdded, with: {snapshot in 

      let snapDict = snapshot.value as? NSDictionary 
      let message = snapDict?["Message"] as? String ?? "" 
      let username = snapDict?["user_name"] as? String ?? "" 
      let userIDString = snapDict?["uid"] as? String ?? "" 
      let firebaseUserPhotoURL = snapDict?["photo_url"] as? String ?? "" 






//   print("username: " + username) 
//   print("message: " + message) 
//   print("URL: " + firebaseUserPhotoURL) 
//   print("Snapshot" + snapshot.key) 

      //Time String from Firbase Database 
      let timeString = snapDict?["time_stamp"] as? String ?? "2017-03-06 00:20:51" 

      //timeAgoSinceDate - Format and call function to recieve time of post 
      let dateFormatter = DateFormatter() 
      dateFormatter.dateFormat = "yyyy-MM-dd HH:mm:ss" 
      let timeStampDate = dateFormatter.date(from: timeString) 
      let timeStamp = timeAgoSinceDate(date: timeStampDate!, numericDates: false) 


      //Assign array values 
      self.generalRoomDataArr.insert(postStruct(username: username, message: message, photoURL: firebaseUserPhotoURL, timeStamp: timeStamp, cellUserId: userIDString), at: 0) 
      self.tableView.reloadData() 


     }) 


     //End Here 


     self.tableView.reloadData() 



    }//End ViewDidLoad 





    //MARK:      Buttons (BackButton || Send Button) 


    @IBAction func backButtonPressed(_ sender: UIButton) { 
     self.performSegue(withIdentifier: "BackToRoom", sender: nil) 
    } 


    //Message Send button is pressed data uploaded to firebase 
    @IBAction func sendButtonPressed(_ sender: UIButton) { 

     //If a character exists will be uploaded to firebase 
     if ((messageTextField.text?.characters.count)! > 0) { 

     let message : String = self.messageTextField.text! 
     UploadGeneralChatRoom(message: message) //upload to general_room 
     self.messageTextField.text = nil 
     messageTextField.resignFirstResponder()//Quit keyboard 

     self.tableView.reloadData() //Reload tableView 
     //UploadUserData() //Update Rank in database 

     } 


    } 




    //MARK:      TableView (Cell & Labels) 



    //Get Data of current cell that has been tapped 
    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) { 

     let userIdentityString = generalRoomDataArr[indexPath.row].cellUserId 

     print("Uid of cell Data: " + userIdentityString!) 
     print("section: \(indexPath.section)") 
     print("row: \(indexPath.row)") 

     //1.) If imageView touch is deteected 
     //2.) Segua to new view controller by passing in the string UID(userIdentityString) of the cell 
     //3.) Get database information based on the UID that is added(look at prevous methods) 
     //  -might have to call this function and use separeate function 
     //4.) Output data from database Users to represent a user profile 



     //All you have to do is pass a UID (Check other Database methods to send UID) 

    } 


    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int { 
     return generalRoomDataArr.count // your number of cell here 
    } 




    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell { 


     let cell = tableView.dequeueReusableCell(withIdentifier: "cell") 

     //Transform Data From^to load at the bottom 
     tableView.transform = CGAffineTransform (scaleX: 1,y: -1); 
     cell?.contentView.transform = CGAffineTransform (scaleX: 1,y: -1); 
     cell?.accessoryView?.transform = CGAffineTransform (scaleX: 1,y: -1); 

     //Set username label to display username 
     let usernameLabel = cell?.viewWithTag(1) as! UILabel 
     usernameLabel.text = generalRoomDataArr[indexPath.row].username 


     //Set message label to display message 
//  let messageLabel = cell?.viewWithTag(2) as! UILabel 
//  messageLabel.text = generalRoomDataArr[indexPath.row].message 
//  messageLabel.numberOfLines = 0 

     let messageLabel = cell?.viewWithTag(5) as! UITextView 
     messageLabel.text = generalRoomDataArr[indexPath.row].message 



     //initialize UI Profile Image 
     let imageView = cell?.viewWithTag(3) as! UIImageView 

     //Make Porfile Image Cirlce 
     imageView.layer.cornerRadius = imageView.frame.size.width/2 
     imageView.clipsToBounds = true 

     //Set timeStampLabel to current time AGO 
     let timeStampLabel = cell?.viewWithTag(4) as! UILabel 
     timeStampLabel.text = generalRoomDataArr[indexPath.row].timeStamp 
     timeStampLabel.numberOfLines = 0 


     //Loading and change of Usesrs profile image on chat cell 
     let userProfileChatImage = generalRoomDataArr[indexPath.row].photoURL 

     //Load profile image(on cell) with URL & Alamofire Library 
      let downloadURL = NSURL(string: userProfileChatImage!) 
      imageView.af_setImage(withURL: downloadURL as! URL) 

     return cell! 
    } 




    //MARK:    KeyBoard close on return button 


    // Hide the keyboard when the return key pressed 
    func textFieldShouldReturn(_ messageTextField: UITextField) -> Bool { 
     messageTextField.resignFirstResponder() 
     return true 
    } 




}//END CLASS 

Answer 1

設置textView的高度，並將其作爲NSLayoutConstraints連接到視圖控制器並通過textViewDidChange進行更新。

請參見下面的代碼中textViewHeight是NSLayoutConstraints

func textViewDidChange(_ textView: UITextView) { 

    let fixedWidth = textView.frame.size.width 
    textView.sizeThatFits(CGSize(width: fixedWidth, height: CGFloat.greatestFiniteMagnitude)) 
    let newSize = textView.sizeThatFits(CGSize(width: fixedWidth, height: CGFloat.greatestFiniteMagnitude)) 
    var newFrame = textView.frame 
    newFrame.size = CGSize(width: max(newSize.width, fixedWidth), height: newSize.height) 
    textView.frame = newFrame; 
    textViewHeight.constant = newFrame.size.height 
    tableView.beginUpdates() 
    tableView.endUpdates() 
} 

Answer 2

您是否嘗試通過textView委託方法更改大小？也許是這樣的：

func textViewDidChange(_ textView: UITextView) { 
    let currentOffset = tableView.contentOffset 
    UIView.setAnimationsEnabled(false) 
    tableView.beginUpdates() 
    tableView.endUpdates() 
    UIView.setAnimationsEnabled(true) 
    tableView.setContentOffset(currentOffset, animated: false) 
} 

我用這個代碼來調整單元格的高度，因爲用戶鍵入到textview中。不知道它是否會爲你的目的而工作，但給它一個鏡頭。