Swift中的多色文本

Question

你能帮助我吗，我试着制作多色文字，但是我收到一个SIGABRT错误，但绝对不知道它来自哪里。这是代码：

class ViewController: UIViewController {    

@IBOutlet weak var ColoredTxt: UILabel!
override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
    var Timer = NSTimer.scheduledTimerWithTimeInterval(0.1, target: ColoredTxt, selector: Selector("ColoredTxt"), userInfo: nil, repeats: true)

}


@IBAction func Btn(sender: AnyObject) {

    let redValue = CGFloat(drand48())
    let greenValue = CGFloat(drand48())
    let blueValue = CGFloat(drand48())

    ColoredTxt.textColor = UIColor(red: redValue, green: greenValue, blue: blueValue, alpha: 1.0)
}


func randomColor() {

    let redValue = CGFloat(drand48())
    let greenValue = CGFloat(drand48())
    let blueValue = CGFloat(drand48())

    ColoredTxt.textColor = UIColor(red: redValue, green: greenValue, blue: blueValue, alpha: 1.0)

    }
}

Answer 1

你需要这样的东西，使用NSMutableAttributedString允许你做这样的事情

这是代码

   func multicolorString(originalString : String) ->NSMutableAttributedString
    {
        let mutableString = NSMutableAttributedString(string: originalString)

        for index in 0..<originalString.characters.count
        {
            if(index % 2 == 0)
            {
                mutableString.addAttribute(NSForegroundColorAttributeName, value: UIColor.green, range: NSMakeRange(index, 1))
            }else if(index % 3 == 0)
            {
                mutableString.addAttribute(NSForegroundColorAttributeName, value: UIColor.blue, range: NSMakeRange(index, 1))
            }else{
                mutableString.addAttribute(NSForegroundColorAttributeName, value: UIColor.red, range: NSMakeRange(index, 1))
            }
        }

        return mutableString
    }

然后像这样使用

self.ColoredTxt.attributedText = self.multicolorString("Owner")

我希望这有助于你

Answer 2

func getAttribute(_ array: [[String: UIColor]]) -> NSAttributedString {
    let attributedString = NSMutableAttributedString(string: "" )

    for item in array {
        let text = item.keys.first ?? ""
        let color = item.values.first ?? UIColor.black
        let attributed = NSMutableAttributedString(string: text, attributes: [NSForegroundColorAttributeName : color])
        attributedString.append(attributed)
    }

    return attributedString
}

用法：

let attributedString = getAttribute([["H" : UIColor.black], ["i" : UIColor.gray]])
button.setAttributedTitle(attributedString, for: .normal)
label.attributedText = attributedString