I'm trying to add a three-component Picker (UIPickerView) to a SwiftUI app (in a traditional UIKit app, the data source would return 3
from the numberOfComponents
method), but I can't find an example of this anywhere.
I've tried adding an HStack of three single-component Pickers, but the perspective is off from what it would be if they were all part of a single Picker.
Here's an adaptation of the solutions above, using the UIKit picker:
import SwiftUI
struct PickerView: UIViewRepresentable {
var data: [[String]]
@Binding var selections: [Int]
//makeCoordinator()
func makeCoordinator() -> PickerView.Coordinator {
Coordinator(self)
}
//makeUIView(context:)
func makeUIView(context: UIViewRepresentableContext<PickerView>) -> UIPickerView {
let picker = UIPickerView(frame: .zero)
picker.dataSource = context.coordinator
picker.delegate = context.coordinator
return picker
}
//updateUIView(_:context:)
func updateUIView(_ view: UIPickerView, context: UIViewRepresentableContext<PickerView>) {
for i in 0...(self.selections.count - 1) {
view.selectRow(self.selections[i], inComponent: i, animated: false)
}
context.coordinator.parent = self // fix
}
class Coordinator: NSObject, UIPickerViewDataSource, UIPickerViewDelegate {
var parent: PickerView
//init(_:)
init(_ pickerView: PickerView) {
self.parent = pickerView
}
//numberOfComponents(in:)
func numberOfComponents(in pickerView: UIPickerView) -> Int {
return self.parent.data.count
}
//pickerView(_:numberOfRowsInComponent:)
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
return self.parent.data[component].count
}
//pickerView(_:titleForRow:forComponent:)
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
return self.parent.data[component][row]
}
//pickerView(_:didSelectRow:inComponent:)
func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
self.parent.selections[component] = row
}
}
}
import SwiftUI
struct ContentView: View {
private let data: [[String]] = [
Array(0...10).map { "\($0)" },
Array(20...40).map { "\($0)" },
Array(100...200).map { "\($0)" }
]
@State private var selections: [Int] = [5, 10, 50]
var body: some View {
VStack {
PickerView(data: self.data, selections: self.$selections)
Text("\(self.data[0][self.selections[0]]) \(self.data[1][self.selections[1]]) \(self.data[2][self.selections[2]])")
} //VStack
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView()
}
}