Swift Swiftui 将 colored颜色 保存到 UserDefaults 并从 @AppStorage 使用它

默认情况下，您不能将Color()存储在UserDefaults中，但可以使用@AppStorage和NSKeyedArchiver来实现此结果.完整的示例和文档来自this article.

创建扩展:

import Foundation
import SwiftUI
import UIKit

extension Color: RawRepresentable {

    public init?(rawValue: String) {
        
        guard let data = Data(base64Encoded: rawValue) else{
            self = .black
            return
        }
        
        do{
            let color = try NSKeyedUnarchiver.unarchiveTopLevelObjectWithData(data) as? UIColor ?? .black
            self = Color(color)
        }catch{
            self = .black
        }
        
    }

    public var rawValue: String {
        
        do{
            let data = try NSKeyedArchiver.archivedData(withRootObject: UIColor(self), requiringSecureCoding: false) as Data
            return data.base64EncodedString()
            
        }catch{
            
            return ""
            
        }
        
    }

}

并像这样使用它:

@AppStorage("colorkey") var storedColor: Color = .black
    
    var body: some View {
        
        VStack{
            ColorPicker("Persisted Color Picker", selection: $storedColor, supportsOpacity: true)
            }
}