UIPickerView 仅填充"?"

Question

所以我试图从数组中填充我的两个选择器视图，但只提出了"？"我已经在这里尝试了一些类似类型的修复程序，但没有一个奏效。

@IBOutlet var startPickerView: UIPickerView!
@IBOutlet var endPickerView: UIPickerView!
var startPickerData: [Int] = []
var endPickerData: [Int] = []
let startArray = (1...999).map { $0 }
let endArray = (2...1000).map { $0 }
let startPickerCellIndexPath = IndexPath(row: 1, section: 1)
let endPickerCellIndexPath = IndexPath(row: 1, section: 2)
var isStartPickerShown: Bool = false {
didSet {
startPickerView.isHidden = !isStartPickerShown
}
}
var isEndPickerShown: Bool = false {
didSet {
endPickerView.isHidden = !isEndPickerShown
}
}
override func viewDidLoad() {
super.viewDidLoad()
self.startPickerView.delegate = self
self.startPickerView.dataSource = self
self.endPickerView.delegate = self
self.endPickerView.dataSource = self
startPickerData = startArray
endPickerData = endArray
self.startPickerView.reloadAllComponents()
self.endPickerView.reloadAllComponents()
}
// MARK: - Table view data source
override func numberOfSections(in tableView: UITableView) -> Int {
// #warning Incomplete implementation, return the number of sections
return 2
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
// #warning Incomplete implementation, return the number of rows
return 1
}
override func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
switch indexPath {
case startPickerCellIndexPath:
if isStartPickerShown {
return 216.0
} else {
return 0.0
}
case endPickerCellIndexPath:
if isEndPickerShown {
return 216.0
} else {
return 0.0
}
default:
return 44.0
}
}
override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
tableView.deselectRow(at: indexPath, animated: true)
switch indexPath {
case startPickerCellIndexPath:
if isStartPickerShown {
isStartPickerShown = false
} else if isStartPickerShown {
isStartPickerShown = false
isStartPickerShown = true
} else {
isStartPickerShown = true
}
tableView.beginUpdates()
tableView.endUpdates()
case endPickerCellIndexPath:
if isEndPickerShown {
isEndPickerShown = false
} else if isEndPickerShown {
isEndPickerShown = false
isEndPickerShown = true
} else {
isEndPickerShown = true
}
tableView.beginUpdates()
tableView.endUpdates()  
default:
break
}
}

func numberOfComponents(in pickerView: UIPickerView) -> Int {
return 1
}

// The number of rows of data
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
if pickerView.tag == 1 {
return startPickerData.count
} else {
return endPickerData.count
}
}
// The data to return fopr the row and component (column) that's being passed in
private func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> Int? {
let startView: Int = startPickerData[row]
let endView: Int = endPickerData[row]
if pickerView.tag == 1 {
return startView
} else {
return endView
}
}
}

我已经为此工作了一天半，但无法弄清楚为什么它不起作用，我已经从这里尝试了几个修复程序。

Answer 1

您需要将最底部的私有方法更改为：

// The data to return fopr the row and component (column) that's being passed in
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
let startView: Int = startPickerData[row]
let endView: Int = endPickerData[row]
if pickerView.tag == 1 {
return String(format: "%d", startView)
} else {
return String(format: "%d", endView)
}
}