swift - ViewController 中的 CustomCell 标签不显示数据

Question

下午好，我正在 Firebase 中运行一个查询，我用得到的信息来运行另一个查询。我遇到的问题是在第二个 CustomCell 上显示数据。我正在使用 print 语句，数据显示在控制台中。 Segues 按预期工作，TableViews 设置为数据源和委托(delegate)，IBOutlet 就位， Storyboard中的单元标识符也就位。我找不到解决方案，我不确定我错过了什么。任何帮助是极大的赞赏。

包含第二个查询的单元格

class PatlistCell: UITableViewCell {

    @IBOutlet weak var ptnameLbl: UILabel!
    @IBOutlet weak var assignedmdLbl: UILabel!
    @IBOutlet weak var officemdLbl: UILabel!
    @IBOutlet weak var roomnumberLbl: UILabel!
    @IBOutlet weak var seenoseeLbl: UILabel!
    @IBOutlet weak var assigneddateLbl: UILabel!
    @IBOutlet weak var ptdataBtn: UIButton!

var ptdatas = [PTData]()
var ptdatainfoRef: CollectionReference!
var delegate: MyCellDelegate?
var patDataQuery: Query!

override func awakeFromNib() {
    super.awakeFromNib()

    ptdatainfoRef = Firestore.firestore().collection(PTLIST_REF)
}

func configurePatListCell(ptlist: PTList) {

    ptnameLbl.text = ptlist.ptname
    assignedmdLbl.text = ptlist.assignedmd
    officemdLbl.text = ptlist.officemd
    roomnumberLbl.text = ptlist.room
    seenoseeLbl.text = ptlist.seenosee
    assigneddateLbl.text = ptlist.assigneddate 
}

@IBAction func ptdataTapped(_ sender: Any) {

    let patDataQuery = ptdatainfoRef.whereField("ptname", 
isEqualTo: (ptnameLbl.text!))
        .whereField("assignedmd", isEqualTo: (assignedmdLbl.text!))
        .whereField("officemd", isEqualTo: (officemdLbl.text!))
        .whereField("room", isEqualTo: (roomnumberLbl.text!))
        .whereField("seenosee", isEqualTo: (seenoseeLbl.text!))
        .whereField("assigneddate", isEqualTo: 
(assigneddateLbl.text!))

    patDataQuery.getDocuments { (snapshot, error) in
        if let err = error {
            debugPrint("error getting data: \(err)")
        } else {
            guard let snap = snapshot else { return }
            for document in snap.documents {
                let data = document.data()
                let ptname = data[PTNAME] as? String ?? ""
                let dob = data[DOB] as? String ?? ""
                let fin = data[FIN] as? String ?? ""
                let officemd = data[OFFICEMD] as? String ?? ""
                let assignedmd = data[ASSIGNEDMD] as? String ?? ""
                let assigneddate = data[ASSIGNEDDATE] as? String ?? 
""
                let room = data[ROOM] as? String ?? ""
                let diagnoses = data[DIAGNOSES] as? String ?? ""
                let reasonforadmitorconsult = 
data[REASONFORADMITORCONSULT] as? String ?? ""
                let goalofhospitalization = 
data[GOALOFHOSPITALIZATION] as? String ?? ""
                let seenosee = data[SEENOSEE] as? String ?? ""
                let notestocbo = data[NOTESTOCBO] as? String ?? ""
                let comments = data[COMMENTS] as? String ?? ""
                let hosp = data[HOSP] as? String ?? ""
                let team = data[TEAM] as? String ?? ""

                let newPtdata = PTData (ptname: ptname, dob: dob, 
fin: fin, officemd: officemd, assignedmd: assignedmd, assigneddate: 
assigneddate, room: room, diagnoses: diagnoses, 
reasonforadmitorconsult: reasonforadmitorconsult, 
goalofhospitalization: goalofhospitalization, seenosee: seenosee, 
notestocbo: notestocbo, comments: comments, hosp: hosp, team: team)

                self.ptdatas.append(newPtdata)
                print(document.data())

            }
        }
     self.delegate?.cellButtonPressed(self.ptdatas) //argument to pass the variable to the VC
    }

 }

}

View Controller

class ResultsdataVC: UIViewController  {

@IBOutlet weak var resultsTableView: UITableView!

var ptlists = [PTList]()
var ptdatas = [PTData]()

override func viewDidLoad() {
    super.viewDidLoad()
    resultsTableView.delegate = self
    resultsTableView.dataSource = self
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if segue.identifier == "gotoptinfo" {
        let destVC = segue.destination as! PatdataVC
        destVC.ptdatas = ptdatas
    }
}
}

extension ResultsdataVC: UITableViewDataSource, 
UITableViewDelegate, MyCellDelegate {

func tableView(_ tableView: UITableView, numberOfRowsInSection 
section: Int) -> Int {
    return ptlists.count
}

func tableView(_ tableView: UITableView, cellForRowAt indexPath: 
IndexPath) -> UITableViewCell {
    if tableView == self.resultsTableView {
        let cell = tableView.dequeueReusableCell(withIdentifier: 
"PatlistCell", for: indexPath) as? PatlistCell
        cell!.configurePatListCell(ptlist: ptlists[indexPath.row])
        cell!.delegate = self
        return cell!
    }
    return UITableViewCell()
}

func cellButtonPressed() {
    self.ptdatas = ptdatas . //this allows the VC populate the local variable                              
    performSegue(withIdentifier: "gotoptinfo", sender: self)
}
}

第二个单元格

class PatdataCell: UITableViewCell {

@IBOutlet weak var ptnameLbl: UILabel!
@IBOutlet weak var dobLbl: UILabel!
@IBOutlet weak var finLbl: UILabel!
@IBOutlet weak var officemdLbl: UILabel!
@IBOutlet weak var assignedmdLbl: UILabel!
@IBOutlet weak var assigneddateLbl: UILabel!
@IBOutlet weak var roomnumberLbl: UILabel!
@IBOutlet weak var diagnosesLbl: UILabel!
@IBOutlet weak var reasonforadmitorconsultLbl: UILabel!
@IBOutlet weak var goalofhospitalizationLbl: UILabel!
@IBOutlet weak var seenoseeLbl: UILabel!
@IBOutlet weak var notestocboLbl: UILabel!
@IBOutlet weak var commentsLbl: UILabel!
@IBOutlet weak var hospitalLbl: UILabel!
@IBOutlet weak var teamLbl: UILabel!

override func awakeFromNib() {
    super.awakeFromNib()
}

func configurePatDataCell(ptdata: PTData) {

    ptnameLbl.text = ptdata.ptname
    dobLbl.text = ptdata.dob
    finLbl.text = ptdata.fin
    officemdLbl.text = ptdata.officemd
    assignedmdLbl.text = ptdata.assignedmd
    assigneddateLbl.text = ptdata.assigneddate
    roomnumberLbl.text = ptdata.room
    diagnosesLbl.text = ptdata.diagnoses
    reasonforadmitorconsultLbl.text = 
ptdata.reasonforadmitorconsult
    goalofhospitalizationLbl.text = ptdata.goalofhospitalization
    seenoseeLbl.text = ptdata.seenosee
    notestocboLbl.text = ptdata.notestocbo
    commentsLbl.text = ptdata.comments
        hospitalLbl.text = ptdata.hosp
        teamLbl.text = ptdata.team

    }
}

第二个ViewController

class PatdataVC: UIViewController, UITableViewDelegate, 
UITableViewDataSource {

var ptdatas = [PTData]()

@IBOutlet weak var patDataTableView: UITableView!

override func viewDidLoad() {
    super.viewDidLoad()

    patDataTableView.delegate = self
    patDataTableView.dataSource = self
}

func tableView(_ tableView: UITableView, numberOfRowsInSection 
section: Int) -> Int {
    return ptdatas.count
}

func tableView(_ tableView: UITableView, cellForRowAt indexPath: 
IndexPath) -> UITableViewCell {
    if tableView == patDataTableView {
        let cell = tableView.dequeueReusableCell(withIdentifier: 
"PatdataCell", for: indexPath) as? PatdataCell
        cell!.configurePatDataCell(ptdata: ptdatas[indexPath.row])
        return cell!
    }
    return UITableViewCell()
}
}

单元代表

protocol MyCellDelegate {
func cellButtonPressed (_ ptdatas: [PTData])
}

Answer 1

ptdatas 存在于 ResultsdataVC 和 PatlistCell 中。在您的 PatlistCell 中，会附加此数据，但 ResultsdataVC 中的变量不会更新。

在准备segue中，您正在设置空的ptdatas列表。

解决方案是让您的委托(delegate)符合 cellButtonPressed(ptdatas: [PTData]) 并将生成的数组从 tableViewCell 传递到 ResultsdataVC，并在执行 segue 之前更新 ResultsdataVC PTData 数组。