问题
I was using a label before and it was working fine. But I just realized I need a UITextView instead and I cant seem to get it working right.
The text just keeps going to the right and I can no longer see it. I need it to adjust to the dynamic height of the cell liked it worked before with the label.
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
回答1:
set the height of textView and connect it to view controller as NSLayoutConstraints and update it via the textViewDidChange.
See the below code in which textViewHeight is the 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()
}
回答2:
Did you try changing the size from textView delegate methods? Perhaps something like this:
func textViewDidChange(_ textView: UITextView) {
let currentOffset = tableView.contentOffset
UIView.setAnimationsEnabled(false)
tableView.beginUpdates()
tableView.endUpdates()
UIView.setAnimationsEnabled(true)
tableView.setContentOffset(currentOffset, animated: false)
}
I used this code to adjust a cell's height as the user typed into the textview. Not sure if it will work for your purposes but give it a shot.
来源：https://stackoverflow.com/questions/43398867/dynamic-cell-height-for-textview-swift