ViewController 中的 CustomCell 标签不显示数据
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【中文标题】ViewController 中的 CustomCell 标签不显示数据【英文标题】:CustomCell label in ViewController not displaying data 【发布时间】:2019-08-01 21:35:59 【问题描述】:下午好,我正在 Firebase 中运行一个查询,我得到的信息我用它来运行另一个查询。我遇到的问题是在第二个 CustomCell 上显示数据。我正在使用打印语句,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,IBOutlets 到位,Storyboard 中的单元格标识符也到位。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。
具有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
视图控制器
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
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
第二个视图控制器
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])
【问题讨论】:
【参考方案1】:ptdatas
存在于 ResultsdataVC 和您的 PatlistCell 中。在您的 PatlistCell 中附加了此数据,但未更新 ResultsdataVC 中的变量。
在prepare for segue
中,您正在设置空的ptdatas
列表。
一种解决方案是让您的委托符合cellButtonPressed(ptdatas: [PTData])
并将您生成的数组从 tableViewCell 传递到您的 ResultsdataVC 并在执行 segue 之前更新 ResultsdataVC PTData 数组。
【讨论】:
你是绝对正确的,列表是空的。我刚刚在为 segue 做准备时使用了 print 语句“print(ptdatas),我得到的只是 []。现在,我进行了您建议的更改,但是在更新 PatlistCell 中的委托时出现错误。我正在使用这个: self.delegate?.cellButtonPressed(ptdatas: [PTData]) 并且错误是“无法将 '[PTData].Type' 类型的值转换为预期的参数类型 '[PTData]'。有任何想法吗?谢谢! 已找到解决方案,我已更新初始代码以反映更改。谢谢以上是关于ViewController 中的 CustomCell 标签不显示数据的主要内容,如果未能解决你的问题,请参考以下文章
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