如何在countDownTimer上在DatePicker中设置SwiftUI模式？
如何在countDownTimer上在DatePicker中设置SwiftUI模式？
提问于 2019-10-26 20:28:36
使用UIKit，UIDatePicker允许设置模式为UIDatePicker.Mode.countDownTimer，我们可以设置持续时间。
使用SwiftUI，我看不到任何解决这个问题的原生方法。唯一的方法是与UIKit进行接口？
更新
唯一找到的解决办法
DurationPickerView.swift
import SwiftUI
import UIKit
struct DurationPickerView: UIViewRepresentable {
@Binding var time: Time
func makeCoordinator() -> DurationPickerView.Coordinator {
Coordinator(self)
}
func makeUIView(context: Context) -> UIDatePicker {
let datePicker = UIDatePicker()
datePicker.datePickerMode = .countDownTimer
datePicker.addTarget(context.coordinator, action: #selector(Coordinator.onDateChanged), for: .valueChanged)
return datePicker
}
func updateUIView(_ datePicker: UIDatePicker, context: Context) {
let date = Calendar.current.date(bySettingHour: time.hour, minute: time.minute, second: time.second, of: datePicker.date)!
datePicker.setDate(date, animated: true)
}
class Coordinator: NSObject {
var durationPicker: DurationPickerView
init(_ durationPicker: DurationPickerView) {
self.durationPicker = durationPicker
}
@objc func onDateChanged(sender: UIDatePicker) {
print(sender.date)
let calendar = Calendar.current
let date = sender.date
durationPicker.time = Time(hour: calendar.component(.hour, from: date), minute: calendar.component(.minute, from: date), second: calendar.component(.second, from: date))
}
}
}Time.swift
import Foundation
struct Time {
var hour: Int
var minute: Int
var second: Int = 0
}回答 2
Stack Overflow用户
回答已采纳
发布于 2020-06-06 22:47:17
现在获得倒计时行为的唯一方法是将UIDatePicker包装在自定义视图中。
下面是使用Ailton Vieira Pinto Filho's的简化countDownDuration代码版本。
import SwiftUI
struct DurationPicker: UIViewRepresentable {
@Binding var duration: TimeInterval
func makeUIView(context: Context) -> UIDatePicker {
let datePicker = UIDatePicker()
datePicker.datePickerMode = .countDownTimer
datePicker.addTarget(context.coordinator, action: #selector(Coordinator.updateDuration), for: .valueChanged)
return datePicker
}
func updateUIView(_ datePicker: UIDatePicker, context: Context) {
datePicker.countDownDuration = duration
}
func makeCoordinator() -> Coordinator {
Coordinator(self)
}
class Coordinator: NSObject {
let parent: DurationPicker
init(_ parent: DurationPicker) {
self.parent = parent
}
@objc func updateDuration(datePicker: UIDatePicker) {
parent.duration = datePicker.countDownDuration
}
}
}Stack Overflow用户
发布于 2021-12-03 22:38:22
这是另一个解决办法。只是把两个人放在一起，这样看起来就不太好了。但是它确实避免了另一个答案中的错误，因为它不会在第一次更新在选择器中选择的值。
import SwiftUI
struct CountDownPicker: View {
var hours = Array(0...23)
var min = Array(0...59)
@Binding var selectedHours: Int
@Binding var selectedMins: Int
var body: some View {
GeometryReader { geometry in
HStack {
Picker(selection: $selectedHours, label: Text("hrs")) {
ForEach(0..<self.hours.count) {
Text("\(self.hours[$0]) hrs")
.bold()
}
}
.frame(maxWidth: geometry.size.width / 2)
.clipped()
.pickerStyle(.wheel)
Picker(selection: self.$selectedMins, label: Text("mins")) {
ForEach(0..<self.min.count) {
Text("\(self.min[$0]) mins")
.bold()
}
}
.frame(maxWidth: geometry.size.width / 2)
.clipped()
.pickerStyle(.wheel)
}
}
.offset(y: -100)
.padding()
.frame(width: .infinity, height: 140, alignment: .center)
}
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/58574463
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