ios - 如何存档文本颜色为渐变的 UItextfield？

Question

我正在尝试存档一个文本字段。其中文本字段文本是渐变色。我将其存档以将数据存储到我的核心数据库中。但是存档方法给我这个错误。 *** 由于未捕获的异常“NSInternalInconsistencyException”而终止应用程序，原因:“在这种情况下仅支持 RGBA 或白色颜色空间。” 存档代码是 let data = NSKeyedArchiver.archivedData( withRootObject: testerText) 。 viewdidload 代码是。

  override func viewDidLoad() {
        super.viewDidLoad()

       testerText.textColor = UIColor(patternImage: gradientImage(size: testerText.frame.size, color1: CIColor(color: UIColor.green), color2: CIColor(color: UIColor.red), direction: .Left))

        let data = NSKeyedArchiver.archivedData(withRootObject: testerText)

        //print(toshow)

    }  

下面给出了使文本颜色渐变的函数。

func gradientImage(size: CGSize, color1: CIColor, color2: CIColor, direction: GradiantDerection = .Up) -> UIImage {

    let context = CIContext(options: nil)
    let filter = CIFilter(name: "CILinearGradient")
    var startVector: CIVector
    var endVector: CIVector

    filter!.setDefaults()

    switch direction {
    case .Up:
        startVector = CIVector(x: size.width * 0.5, y: 0)
        endVector = CIVector(x: size.width * 0.5, y: size.height)
    case .Left:
        startVector = CIVector(x: size.width, y: size.height * 0.5)
        endVector = CIVector(x: 0, y: size.height * 0.5)
    case .UpLeft:
        startVector = CIVector(x: size.width, y: 0)
        endVector = CIVector(x: 0, y: size.height)
    case .UpRight:
        startVector = CIVector(x: 0, y: 0)
        endVector = CIVector(x: size.width, y: size.height)
    }

    filter!.setValue(startVector, forKey: "inputPoint0")
    filter!.setValue(endVector, forKey: "inputPoint1")
    filter!.setValue(color1, forKey: "inputColor0")
    filter!.setValue(color2, forKey: "inputColor1")

    let image = UIImage(cgImage: context.createCGImage(filter!.outputImage!, from: CGRect(x: 0, y: 0, width: size.width, height: size.height))!)
    return image
}

现在我想知道如何归档那些 textfield 以便我可以将其存储到我的数据库中？

Answer 1

为 TextField 中的 GradientText 试试这个

      override func viewDidLoad() {
          super.viewDidLoad()
      testerText.textColor = UIColor(patternImage: gradientImage(size: testerText.frame.size, color1: CIColor(color: UIColor(red: 1.0, green: 1.0, blue: 1.0, alpha: 1.0)), color2: CIColor(color: UIColor(red: 1.0, green: 1.0, blue: 1.0, alpha: 0.2))))

      let data = NSKeyedArchiver.archivedData(withRootObject: testerText.text as Any)
      }



   func gradientImage(size: CGSize, color1: CIColor, color2: CIColor) -> UIImage {

       let context = CIContext(options: nil)
       let filter = CIFilter(name: "CILinearGradient")
       var startVector: CIVector
       var endVector: CIVector

      filter!.setDefaults()

      startVector = CIVector(x: size.width * 0.5, y: 0)
      endVector = CIVector(x: size.width * 0.5, y: size.height * 0.8)

          filter!.setValue(startVector, forKey: "inputPoint0")
          filter!.setValue(endVector, forKey: "inputPoint1")
          filter!.setValue(color1, forKey: "inputColor0")
          filter!.setValue(color2, forKey: "inputColor1")

      let image = UIImage(cgImage: 
      context.createCGImage(filter!.outputImage!, from: CGRect(x: 0, y: 0, width: size.width, height: size.height))!)
         return image

        }