无法向下拖动/关闭 UIColorPickerViewController答案

【问题标题】：Can't drag down/dismiss UIColorPickerViewController无法向下拖动/关闭 UIColorPickerViewController
【发布时间】：2022-08-10 01:03:41
【问题描述】：

我使用 sheet() 方法将 UIColorPickerViewController 显示为工作表，一切正常，但我不能再向下拖动/关闭视图。

import Foundation
import SwiftUI

struct ColorPickerView: UIViewControllerRepresentable {
    private var selectedColor: UIColor!
    
    init(selectedColor: UIColor) {
        self.selectedColor = selectedColor
    }
    
    func makeUIViewController(context: Context) -> UIColorPickerViewController {
        let colorPicker = UIColorPickerViewController()
        colorPicker.selectedColor = self.selectedColor
        
        return colorPicker
    }
    
    func updateUIViewController(_ uiViewController: UIColorPickerViewController, context: Context) {
        // Silent
    }
}

.sheet(isPresented: self.$viewManager.showSheet, onDismiss: {
    ColorPickerView()
}

知道如何使拖动/向下关闭手势起作用吗？

谢谢！

标签： swiftui uiviewcontrollerrepresentable uicolorpickerviewcontroller

【解决方案1】：

在尝试构建类似于上面的颜色选择器时遇到了同样的问题。起作用的是使用“关闭”按钮将颜色选择器“包装”在视图中。并且还发现视图顶部的栏将允许选择器现在被向下拖走。下面是我的包装。（可以向栏添加更多功能，例如标题。）

struct ColorWrapper: View {
    var inputColor: UIColor
    @Binding var isShowingColorPicker: Bool
    @Binding var selectedColor: UIColor?

    var body: some View {
        VStack {
            HStack {
                Spacer()
                Button("Dismiss", action: {
                    isShowingColorPicker = false
                }).padding()
            }
            ColorPickerView(inputColor: inputColor, selectedColor: $selectedColor)
        }
    }
}

为了完整起见，这是我的颜色选择器版本：

import SwiftUI

struct ColorPickerView: UIViewControllerRepresentable {
    typealias UIViewControllerType = UIColorPickerViewController

    var inputColor: UIColor

    @Binding var selectedColor: UIColor?

    @Environment(\.presentationMode) var isPresented

    func makeUIViewController(context: Context) -> UIColorPickerViewController {
        let picker = UIColorPickerViewController()
        picker.delegate = context.coordinator
        picker.supportsAlpha = false
        picker.selectedColor = inputColor
        return picker
    }

    func updateUIViewController(_ uiViewController: UIColorPickerViewController, context: Context) {
        uiViewController.supportsAlpha = false
    }

    func makeCoordinator() -> Coordinator {
        return Coordinator(parent: self)
    }

    class Coordinator: NSObject, UINavigationControllerDelegate, UIColorPickerViewControllerDelegate {
        var parent: ColorPickerView

        init(parent: ColorPickerView) {
            self.parent = parent
        }

        func colorPickerViewControllerDidFinish(_ viewController: UIColorPickerViewController) {
            parent.isPresented.wrappedValue.dismiss()
        }

        func colorPickerViewController(_ viewController: UIColorPickerViewController, didSelect color: UIColor, continuously: Bool) {
            parent.selectedColor = color
            parent.isPresented.wrappedValue.dismiss()
        }
    }

}

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