[英]How would you add a label between two columns in a UIPicker?
正如@Paulw11 所評論的,這里有一個演示實現。
enum PickerComponents: CaseIterable {
case timeFrom
case to
case timeTo
}
enum TimeFrom: String, CaseIterable {
case now = "Now"
case tenAM = "10:00AM"
case quarterToTenAM = "10:15AM"
}
enum TimeTo: String, CaseIterable {
case fiveThirtyPM = "5:30PM"
case fiveFortyFive = "5:45PM"
case sixPM = "6:00PM"
}
class ViewController: UIViewController {
@IBOutlet weak var pickerView: UIPickerView!
private let pickerComponents = PickerComponents.allCases
override func viewDidLoad() {
super.viewDidLoad()
self.pickerView.delegate = self
self.pickerView.dataSource = self
}
}
extension ViewController: UIPickerViewDataSource, UIPickerViewDelegate {
func numberOfComponents(in pickerView: UIPickerView) -> Int {
return pickerComponents.count
}
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
let component = pickerComponents[component]
switch component {
case .timeFrom:
return TimeFrom.allCases.count
case .to:
return 1
case .timeTo:
return TimeTo.allCases.count
}
}
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
let component = pickerComponents[component]
switch component {
case .timeFrom:
return TimeFrom.allCases[row].rawValue
case .to:
return "to"
case .timeTo:
return TimeTo.allCases[row].rawValue
}
}
}
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