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Ich habe einen Controller erstellt, der Administratoren die Möglichkeit gibt, neue Studenten zur Datenbank hinzuzufügen. Ich versuche, ein UIPicker zu einem Textfeld in einer Tabellenansicht hinzuzufügen, die andere benutzerdefinierte Zellen verwendet.Swift: TextField aktualisiert sich nicht nach der Auswahl aus UIPickerView
Der UIPicker erscheint, wenn ich das Feld auswähle, und es gibt auch alle Daten aus meinem Array zurück. Das Problem ist, dass mein Textfeld nach dem Auswählen von etwas aus dem UIPicker NICHT aktualisiert wird. Ein einfacher Druck auf die Konsole bestätigt jedoch, dass die Auswahl funktioniert.
Wie sende ich meine Auswahl korrekt an das Textfeld, das mit dem UIPicker verbunden ist?
class AddStudentInfoController: UITableViewController, UITextFieldDelegate, UIPickerViewDelegate, UIPickerViewDataSource {
@IBOutlet var addStudentGradeTextField: UITextField!
var pickerGrade = UIPickerView()
var allCellsText = [String]()
let firstNameCell = "firstNameCell"
let lastNameCell = "lastNameCell"
let gradeCell = "gradeCell"
var array = ["First Name", "Last Name", "Grade"]
var grade = ["--", "One", "Two", "Three"]
override func viewDidLoad() {
super.viewDidLoad()
pickerGrade.delegate = self
pickerGrade.dataSource = self
pickerGrade.backgroundColor = UIColor.white
self.tableView.tableFooterView = UIView(frame: CGRect.zero)
self.tableView.rowHeight = 60
tableView.register(AddStudentFirstNameCell.self, forCellReuseIdentifier: firstNameCell)
tableView.register(AddStudentLastNameCell.self, forCellReuseIdentifier: lastNameCell)
tableView.register(AddStudentGradeCell.self, forCellReuseIdentifier: gradeCell)
}
// Load tableview
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return array.count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
if indexPath.row == 0 {
let cell = tableView.dequeueReusableCell(withIdentifier: firstNameCell, for: indexPath) as! AddStudentFirstNameCell
cell.textLabel!.text = self.array[indexPath.row]
cell.selectionStyle = UITableViewCellSelectionStyle.none
return cell
}
else if indexPath.row == 1 {
let cell = tableView.dequeueReusableCell(withIdentifier: lastNameCell, for: indexPath) as! AddStudentLastNameCell
cell.textLabel!.text = self.array[indexPath.row]
cell.selectionStyle = UITableViewCellSelectionStyle.none
return cell
}
else {
let cell = tableView.dequeueReusableCell(withIdentifier: gradeCell, for: indexPath) as! AddStudentGradeCell
cell.textLabel!.text = self.array[indexPath.row]
cell.selectionStyle = UITableViewCellSelectionStyle.none
cell.addStudentGradeTextField?.inputView = pickerGrade
return cell
}
}
// Picker view
func textFieldDidBeginEditing(_ textField: UITextField) {
pickerGrade.reloadAllComponents()
pickerGrade.isHidden = false
}
func numberOfComponents(in pickerView: UIPickerView) -> Int {
return 1
}
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int{
return grade.count
}
func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int)
{
addStudentGradeTextField?.text = grade[row]
self.view.endEditing(true)
}
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
return grade[row]
}
// End editing
func textFieldDidEndEditing(_ textField: UITextField) {
allCellsText.append(textField.text!)
}
}
Alle meine benutzerdefinierten Zellen für die Tabellenansicht.
// #
// Custom cells for AddStudent.swift
// #
class AddStudentFirstNameCell: UITableViewCell {
override init(style: UITableViewCellStyle, reuseIdentifier: String?) {
super.init(style: .subtitle, reuseIdentifier: reuseIdentifier)
setupViews()
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
let addStudentTextField: UITextField = {
let addStudentTextField = UITextField()
addStudentTextField.placeholder = "First Name"
addStudentTextField.textColor = .red
addStudentTextField.translatesAutoresizingMaskIntoConstraints = false
addStudentTextField.rightViewMode = UITextFieldViewMode.always
addStudentTextField.autocorrectionType = .no
return addStudentTextField
}()
func setupViews() {
addSubview(addStudentTextField)
addStudentTextField.rightAnchor.constraint(equalTo: self.rightAnchor, constant: 10).isActive = true
addStudentTextField.centerYAnchor.constraint(equalTo: self.centerYAnchor).isActive = true
addStudentTextField.widthAnchor.constraint(equalToConstant: 150).isActive = true
addStudentTextField.heightAnchor.constraint(equalToConstant: 48).isActive = true
}
}
class AddStudentLastNameCell: UITableViewCell {
override init(style: UITableViewCellStyle, reuseIdentifier: String?) {
super.init(style: .subtitle, reuseIdentifier: reuseIdentifier)
setupViews()
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
let addStudentTextField: UITextField = {
let addStudentTextField = UITextField()
addStudentTextField.placeholder = "Last Name"
addStudentTextField.textColor = .red
addStudentTextField.translatesAutoresizingMaskIntoConstraints = false
addStudentTextField.rightViewMode = UITextFieldViewMode.always
addStudentTextField.autocorrectionType = .no
return addStudentTextField
}()
func setupViews() {
addSubview(addStudentTextField)
addStudentTextField.rightAnchor.constraint(equalTo: self.rightAnchor, constant: 10).isActive = true
addStudentTextField.centerYAnchor.constraint(equalTo: self.centerYAnchor).isActive = true
addStudentTextField.widthAnchor.constraint(equalToConstant: 150).isActive = true
addStudentTextField.heightAnchor.constraint(equalToConstant: 48).isActive = true
}
}
class AddStudentGradeCell: UITableViewCell {
override init(style: UITableViewCellStyle, reuseIdentifier: String?) {
super.init(style: .subtitle, reuseIdentifier: reuseIdentifier)
setupViews()
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
let addStudentGradeTextField: UITextField! = {
let addStudentGradeTextField = UITextField()
addStudentGradeTextField.placeholder = "--"
addStudentGradeTextField.textColor = .red
addStudentGradeTextField.translatesAutoresizingMaskIntoConstraints = false
addStudentGradeTextField.rightViewMode = UITextFieldViewMode.always
addStudentGradeTextField.autocorrectionType = .no
return addStudentGradeTextField
}()
func setupViews() {
addSubview(addStudentGradeTextField)
addStudentGradeTextField.rightAnchor.constraint(equalTo: self.rightAnchor, constant: 10).isActive = true
addStudentGradeTextField.centerYAnchor.constraint(equalTo: self.centerYAnchor).isActive = true
addStudentGradeTextField.widthAnchor.constraint(equalToConstant: 150).isActive = true
addStudentGradeTextField.heightAnchor.constraint(equalToConstant: 48).isActive = true
}
}
Crashlog
Starry`@objc AddStudentGradeCell.init(style : UITableViewCellStyle, reuseIdentifier : String?) -> AddStudentGradeCell:
0x10a402980 <+0>: pushq %rbp
0x10a402981 <+1>: movq %rsp, %rbp
0x10a402984 <+4>: subq $0x70, %rsp
0x10a402988 <+8>: movq %rdi, -0x28(%rbp)
0x10a40298c <+12>: movq %rcx, %rdi
0x10a40298f <+15>: movq %rdx, -0x30(%rbp)
0x10a402993 <+19>: movq %rsi, -0x38(%rbp)
0x10a402997 <+23>: movq %rcx, -0x40(%rbp)
0x10a40299b <+27>: callq 0x10a46732a ; symbol stub for: objc_retain
0x10a4029a0 <+32>: movq -0x40(%rbp), %rcx
0x10a4029a4 <+36>: cmpq $0x0, %rcx
0x10a4029a8 <+40>: sete %r8b
0x10a4029ac <+44>: xorb $-0x1, %r8b
0x10a4029b0 <+48>: testb $0x1, %r8b
0x10a4029b4 <+52>: movq %rax, -0x48(%rbp)
0x10a4029b8 <+56>: jne 0x10a4029bc ; <+60> at AddStudent.swift
0x10a4029ba <+58>: jmp 0x10a4029dc ; <+92> at AddStudent.swift
0x10a4029bc <+60>: movq -0x40(%rbp), %rdi
0x10a4029c0 <+64>: callq 0x10a46747a ; symbol stub for: static (extension in Foundation):Swift.String._unconditionallyBridgeFromObjectiveC (Swift.Optional<__ObjC.NSString>) -> Swift.String
0x10a4029c5 <+69>: xorl %esi, %esi
0x10a4029c7 <+71>: movb %sil, %r8b
0x10a4029ca <+74>: movq %rcx, -0x50(%rbp)
0x10a4029ce <+78>: movq %rax, -0x58(%rbp)
0x10a4029d2 <+82>: movq %rdx, -0x60(%rbp)
0x10a4029d6 <+86>: movb %r8b, -0x61(%rbp)
0x10a4029da <+90>: jmp 0x10a4029f9 ; <+121> at AddStudent.swift
0x10a4029dc <+92>: xorl %eax, %eax
0x10a4029de <+94>: movl %eax, %ecx
0x10a4029e0 <+96>: movb $0x1, %dl
0x10a4029e2 <+98>: movq %rcx, %rsi
0x10a4029e5 <+101>: movq %rcx, %rdi
0x10a4029e8 <+104>: movq %rdi, -0x60(%rbp)
0x10a4029ec <+108>: movq %rcx, -0x50(%rbp)
0x10a4029f0 <+112>: movq %rsi, -0x58(%rbp)
0x10a4029f4 <+116>: movb %dl, -0x61(%rbp)
0x10a4029f7 <+119>: jmp 0x10a4029f9 ; <+121> at AddStudent.swift
0x10a4029f9 <+121>: movb -0x61(%rbp), %al
0x10a4029fc <+124>: movq -0x50(%rbp), %rcx
0x10a402a00 <+128>: movq -0x60(%rbp), %rdx
0x10a402a04 <+132>: movq -0x58(%rbp), %rsi
0x10a402a08 <+136>: leaq -0x20(%rbp), %rdi
0x10a402a0c <+140>: movq %rsi, -0x20(%rbp)
0x10a402a10 <+144>: movq %rdx, -0x18(%rbp)
0x10a402a14 <+148>: movq %rcx, -0x10(%rbp)
0x10a402a18 <+152>: andb $0x1, %al
0x10a402a1a <+154>: movb %al, -0x8(%rbp)
0x10a402a1d <+157>: movq -0x30(%rbp), %rcx
0x10a402a21 <+161>: movq %rdi, -0x70(%rbp)
0x10a402a25 <+165>: movq %rcx, %rdi
0x10a402a28 <+168>: movq -0x70(%rbp), %rsi
0x10a402a2c <+172>: movq -0x28(%rbp), %rdx
0x10a402a30 <+176>: callq 0x10a402680 ; Starry.AddStudentGradeCell.init (style : __C.UITableViewCellStyle, reuseIdentifier : Swift.Optional<Swift.String>) -> Starry.AddStudentGradeCell at AddStudent.swift:384
0x10a402a35 <+181>: addq $0x70, %rsp exc_bad_instruction(code=exc_i386_invop,subcode=0x0)
0x10a402a39 <+185>: popq %rbp
0x10a402a3a <+186>: retq
haben Sie Ihr Handy neu zu laden? – karthikeyan
Wird Ihre PickerViewDidSelectRow-Funktion aufgerufen? –
Kannst du dein Storyboard oder Xib zeigen? – User511