将颜色数组保存到用户默认值- iOS SWIFT2.3

Question

我想知道如何将UIColors数组保存到用户默认状态。

我有下面的代码来将单个UIColor保存到用户默认值，有人知道如何修改它以允许我在NS用户默认值中存储UIColor数组吗？

​

extension NSUserDefaults {
    
    func colorForKey(key: String) -> UIColor? {
        var color: UIColor?
        if let colorData = dataForKey(key) {
            color = NSKeyedUnarchiver.unarchiveObjectWithData(colorData) as? UIColor
        }
        return color
    }
    
    
    
    func setColor(color: UIColor?, forKey key: String) {
        var colorData: NSData?
        if let color = color {
            colorData = NSKeyedArchiver.archivedDataWithRootObject(color)
        }
        setObject(colorData, forKey: key)
    }
    
}

​

• 我正在使用Swift 2.3

Answer 1

你可以这样做

let colors = [UIColor.whiteColor(), UIColor.greenColor()] // Array of colors
NSUserDefaults.standardUserDefaults().setObject(NSKeyedArchiver.archivedDataWithRootObject(colors), forKey: "ColorsKey") //For saving in NSUserDefaults
//For retrieving use following 
let decodedColorsData  = NSUserDefaults.standardUserDefaults().objectForKey("ColorsKey") as! NSData
let colorsArray = (NSKeyedUnarchiver.unarchiveObjectWithData(decodedColorsData) as! NSArray) as Array

Answer 2

Swift 4.2:将颜色/颜色保存并加载到用户默认状态注意:默认加载可以工作，但是包含一个不推荐的项，但还没有一个好的示例来替换它。

               let colorToSetAsDefault : UIColor = view.backgroundColor!
                do
                {
                    let data : NSData = try NSKeyedArchiver.archivedData(withRootObject: colorToSetAsDefault,requiringSecureCoding: false) as NSData
                    UserDefaults.standard.set(data, forKey: "userHeadingColor") // your key in quotes
                    UserDefaults.standard.synchronize()
                } // end of do
                catch
                {
                    print("Couldn't save color")
                }  // end of catch

            // load the color back as a test to make sure the save has worked
            if let colorObject = UserDefaults.standard.object(forKey: "userHeadingColor")
            {
                let colorData = colorObject as! NSData
                let color = NSKeyedUnarchiver.unarchiveObject(with: colorData as Data) as? UIColor
                // replace with unarchivedObjectOfClass:fromData:error:
                self.testDefaultsView.backgroundColor = color
            }
            else
            {

            }