我想在 SwiftUI 中使用 DatePicker,它工作正常并且符合预期。我想添加一个时间间隔,如所解释的:UIDatePicker 15 分钟增量 Swift
DatePicker("Please enter a time", selection: $wakeUp, displayedComponents: .hourAndMinute)
SwiftUI 中有修改器吗?
我不相信对此有任何修改。然而,可以通过使用 UIViewRepresentable 来包装 UIDatePicker 来“自己做”:
![](https://i.stack.imgur.com/TuvEO.png)
该代码的基本结构基于与 UIKit 交互教程。
struct MyDatePicker: UIViewRepresentable {
@Binding var selection: Date
let minuteInterval: Int
let displayedComponents: DatePickerComponents
func makeCoordinator() -> Coordinator {
return Coordinator(self)
}
func makeUIView(context: UIViewRepresentableContext<MyDatePicker>) -> UIDatePicker {
let picker = UIDatePicker()
// listen to changes coming from the date picker, and use them to update the state variable
picker.addTarget(context.coordinator, action: #selector(Coordinator.dateChanged), for: .valueChanged)
return picker
}
func updateUIView(_ picker: UIDatePicker, context: UIViewRepresentableContext<MyDatePicker>) {
picker.minuteInterval = minuteInterval
picker.date = selection
switch displayedComponents {
case .hourAndMinute:
picker.datePickerMode = .time
case .date:
picker.datePickerMode = .date
case [.hourAndMinute, .date]:
picker.datePickerMode = .dateAndTime
default:
break
}
}
class Coordinator {
let datePicker: MyDatePicker
init(_ datePicker: MyDatePicker) {
self.datePicker = datePicker
}
@objc func dateChanged(_ sender: UIDatePicker) {
datePicker.selection = sender.date
}
}
}
struct DatePickerDemo: View {
@State var wakeUp: Date = Date()
@State var minterval: Int = 1
var body: some View {
VStack {
Stepper(value: $minterval) {
Text("Minute interval: \(minterval)")
}
MyDatePicker(selection: $wakeUp, minuteInterval: minterval, displayedComponents: .hourAndMinute)
Text("\(wakeUp)")
}
}
}
struct DatePickerDemo_Previews: PreviewProvider {
static var previews: some View {
DatePickerDemo()
}
}
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