约束边界ios Swift

我的故事板UIImage视图和标签有一些严重的问题 . 我想要的就是让我的约束力得以解决，看看我在故事板中如何设置它 .

UI looks like this

Story Board

我想要的只是我的UI，看看我在故事板中的确切方式 .

Problem 1: 单元格未显示完整长度 .

Problem 2: 我不知道如何设置messageLabel的约束，使其适用于自动动态单元 . 代码是正确的，因为我可以让它工作但我的所有约束都搞砸了，我不知道如何正确设置它们 .

• 我是swift的新手

Code(took out non-relevant functions)

import UIKit
import Foundation


struct postStruct {
    let username : String!
    let message : String!
    let photoURL : 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()




        self.tableView.dataSource = self
        self.tableView.delegate = self

        tableView.estimatedRowHeight = 44
        tableView.rowHeight = UITableViewAutomaticDimension



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




    }








    }



    func numberOfSections(in tableView: UITableView) -> Int {
        return 1
    }


    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")

        //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

        //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

        //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)

        // your cell coding
        return cell!
    }