iOS 14 UIColorPicker 吸管工具未返回所选颜色

Question

我目前正在尝试实现新的 iOS 14 UIColorPicker。一切都很好，除了 UIColorPicker 的 eye dropper 功能。选择滴管并采样颜色后，默认行为应该是重新打开 UIColorPicker，并将您选择的颜色作为活动颜色。出于某种原因，这不会发生。这是我的实现，它非常标准，所以我不确定为什么滴管没有按预期运行。

当我按下一些 UI 元素时，这些函数作为选择器传递

@objc func pickColorSky(sender: UIControl){
  presentColorPicker(tag: 1, sender: sender)
}

@objc func pickColorBackground(sender: UIControl){
  presentColorPicker(tag: 2, sender: sender)
}
  
@objc func pickColorGround(sender: UIControl){
  presentColorPicker(tag: 3, sender: sender)
}

这是呈现 UIColorPickerView 本身的函数

@objc private func presentColorPicker(tag: Int, sender: UIControl){
    let vc = UIColorPickerViewController()
    vc.supportsAlpha = false
    vc.delegate = self
    vc.view.tag = tag
    vc.modalPresentationStyle = .popover
    vc.popoverPresentationController?.sourceView = sender
    vc.popoverPresentationController?.sourceRect = sender.bounds
    self.present(vc, animated: true)
}

以及处理与颜色选择器交互的委托方法

extension myViewController: UIColorPickerViewControllerDelegate {
  
  func colorPickerViewControllerDidFinish(_ viewController: UIColorPickerViewController) {
    guard let options = editor?.apiView?.getRenderingOptions() else { return }
      if viewController.view.tag == 1 {
        let newColor = getMobileApiColor(color: viewController.selectedColor)
        options.skyColor = newColor
        skyRow.color.backgroundColor = newColor.uiColor
      }
      else if viewController.view.tag == 2 {
        let newColor = getMobileApiColor(color: viewController.selectedColor)
        options.backgroundColor = newColor
        backgroundRow.color.backgroundColor = newColor.uiColor
      }
      else if viewController.view.tag == 3 {
        let newColor = getMobileApiColor(color: viewController.selectedColor)
        options.groundColor = newColor
        groundRow.color.backgroundColor = newColor.uiColor
      }
      editor?.modelView?.setNeedsDisplay()
  }

Answer 1

试试这个方法colorPickerViewControllerDidSelectColor

extension ViewController: UIColorPickerViewControllerDelegate {
    
    //  Called once you have finished picking the color.
    func colorPickerViewControllerDidFinish(_ viewController: UIColorPickerViewController) {
        self.view.backgroundColor = viewController.selectedColor
        
    }
    
    //  Called on every color selection done in the picker.
    func colorPickerViewControllerDidSelectColor(_ viewController: UIColorPickerViewController) {
            self.view.backgroundColor = viewController.selectedColor
    }
}