本文介绍了textView Swift 的动态单元格高度的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我之前使用过一个标签，效果很好.但我刚刚意识到我需要一个 UITextView 而我似乎无法让它正常工作.
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.
文字一直向右移动，我再也看不到了.我需要它来调整单元格的动态高度，就像它以前使用标签一样.
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
推荐答案
设置 textView 的高度并将其作为 NSLayoutConstraints 连接到视图控制器并通过 textViewDidChange 更新它.
set the height of textView and connect it to view controller as NSLayoutConstraints and update it via the textViewDidChange.
见下面的代码，其中 textViewHeight 是 NSLayoutConstraints
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()
}
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