Ios 如何以编程方式触发 SwiftUI DatePicker

如下图所示，如果您键入日期"Jan 11 2023"，则会显示日期 Select 器.我想实现的是在其他地方有一个按钮，当那个按钮被点击时，自动显示这个日期 Select 器.

有没有人知道是否有办法实现这一点？

DatePicker("Jump to", selection: $date, in: dateRange, displayedComponents: [.date]) 

以下是对@rob mayoff答案的测试.我还是不能 弄清楚为什么它还不起作用.

我在带有iOS 16.2模拟器的iPhone 14和Xcode14.2上进行了测试，也在设备上进行了测试.我注意到的是，虽然叫了triggerDatePickerPopover()，但永远也打不到button.accessibilityActivate().

import SwiftUI

struct ContentView: View {
  @State var date: Date = .now
  let dateRange: ClosedRange<Date> = Date(timeIntervalSinceNow: -864000) ... Date(timeIntervalSinceNow: 864000)

  var pickerId: String { "picker" }

  var body: some View {
    VStack {
      DatePicker(
        "Jump to",
        selection: $date,
        in: dateRange,
        displayedComponents: [.date]
      )
      .accessibilityIdentifier(pickerId)

      Button("Clicky") {
        triggerDatePickerPopover()
          print("Clicky Triggered")
      }
    }
    .padding()
  }
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}

extension NSObject {
  func accessibilityDescendant(passing test: (Any) -> Bool) -> Any? {

    if test(self) { return self }

    for child in accessibilityElements ?? [] {
      if test(child) { return child }
      if let child = child as? NSObject, let answer = child.accessibilityDescendant(passing: test) {
        return answer
      }
    }

    for subview in (self as? UIView)?.subviews ?? [] {
      if test(subview) { return subview }
      if let answer = subview.accessibilityDescendant(passing: test) {
        return answer
      }
    }

    return nil
  }
}


extension NSObject {
  func accessibilityDescendant(identifiedAs id: String) -> Any? {
    return accessibilityDescendant {
      // For reasons unknown, I cannot cast a UIView to a UIAccessibilityIdentification at runtime.
      return ($0 as? UIView)?.accessibilityIdentifier == id
      || ($0 as? UIAccessibilityIdentification)?.accessibilityIdentifier == id
    }
  }
    
    func buttonAccessibilityDescendant() -> Any? {
       return accessibilityDescendant { ($0 as? NSObject)?.accessibilityTraits == .button }
     }
}

extension ContentView {
  func triggerDatePickerPopover() {
    if
      let scene = UIApplication.shared.connectedScenes.first as? UIWindowScene,
      let window = scene.windows.first,
      let picker = window.accessibilityDescendant(identifiedAs: pickerId) as? NSObject,
      let button = picker.buttonAccessibilityDescendant() as? NSObject
    {
        print("triggerDatePickerPopover")
      button.accessibilityActivate()
    }
  }
}

Update 2: I followed up the debug instruction. It seems that with exact same code. My inspector are missing the accessibility identifier. Not knowing why.... feels mind buggingly now.

这里有一个下载项目https://www.icloud.com/iclouddrive/040jHC0jwwJg3xgAEvGZShqFg#DatePickerTest的链接

更新3: @罗布·梅奥夫的解决方案太棒了！对于任何阅读的人来说.如果它对你的情况不起作用，那就等着吧.这可能只是因为设备或模拟器为可访问性做好了准备.