Question

我试图在UILabel中设置文本的静态部分的颜色，而动态部分变成高分。设置颜色的语句与设置高分的语句之间似乎存在冲突。

viewDidLoad()中的这些行会产生＆＃34; Highscore＆＃34;部分绿色。

var myString:NSString = "Highscore\n0"  
var myMutableString = NSMutableAttributedString()

myMutableString = NSMutableAttributedString(string: myString as String, attributes: [NSFontAttributeName:UIFont(name: "Georgia", size: 20.0)!])
myMutableString.addAttribute(NSForegroundColorAttributeName, value: UIColor.greenColor(), range: NSRange(location:0,length:9)) 
labelHighscore.attributedText = myMutableString

虽然另一种方法中的这一行格式化标签以更新分数（0部分），但不保持绿色。

labelHighscore.text = NSString(format: “Highscore\n%i", Highscore) as String

在此行之后调用viewDidLoad()允许＆＃34;高分＆＃34;保持绿色，但分数不会更新。

Answer 1

此代码：

let highScore = 209

let myString = NSString(format: "Highscore\n%i", highScore)

var myMutableString = NSMutableAttributedString()
myMutableString = NSMutableAttributedString(string: myString as String, attributes: [NSFontAttributeName:UIFont(name: "Georgia", size: 20.0)!])
myMutableString.addAttribute(NSForegroundColorAttributeName, value: UIColor.greenColor(), range: NSRange(location:0,length:9))

对我来说效果很好，我不确定你的意思是什么＆＃34;两者都是＆＃34;上方。

如果您拨打以下代码：label.text = "Highscore\n0"，这将覆盖属性字符串，因此无论何时更新highScore的值，您都需要再次设置属性字符串。有几种方法可以使这更容易，例如，您可以创建一个获取分数并返回属性，形成的字符串的函数。像这样：

func getAttributedString(score:Int) -> NSMutableAttributedString {
    let myString = NSString(format: "Highscore\n%i", score)
    let myMutableString = NSMutableAttributedString(string: myString as String, attributes: [NSFontAttributeName:UIFont(name: "Georgia", size: 20.0)!])
    myMutableString.addAttribute(NSForegroundColorAttributeName, value: UIColor.greenColor(), range: NSRange(location:0,length:9))

    return myMutableString
}

然后在viewDidLoad中，您可以设置它的默认值：

labelHighscore.attributedText = getAttributedString(0)

然后每当分数更新时，您都可以更新标签：

let newScore = currentScore + 50
labelHighscore.attributedText = getAttributedString(newScore)

您甚至可以获得为您设置标签的属性文本的功能

func updateScoreLabel(score:Int) -> Void {
    let myString = NSString(format: "Highscore\n%i", score)
    let myMutableString = NSMutableAttributedString(string: myString as String, attributes: [NSFontAttributeName:UIFont(name: "Georgia", size: 20.0)!])
    myMutableString.addAttribute(NSForegroundColorAttributeName, value: UIColor.greenColor(), range: NSRange(location:0,length:9))

    labelHighscore.attributedText = myMutableString
}

修改

我不认为您可以设置属性文本，然后不断更新并保留格式（我可能在这里错了），我认为当您需要更新文本时，您必须设置attribtedText每次都有价值，我做了一个带标签和按钮的快速测试应用程序，每次按钮都会增加100分。当我尝试.text =＆＃34; Highscore：（highScore）＆＃34;格式化已丢失，代码示例如下。

class ViewController: UIViewController { @IBOutlet weak var label: UILabel! @IBOutlet weak var button: UIButton! var highScore = 0 override func viewDidLoad() { super.viewDidLoad() // Do any additional setup after loading the view, typically from a nib. updateScoreLabel() } override func didReceiveMemoryWarning() { super.didReceiveMemoryWarning() // Dispose of any resources that can be recreated. } @IBAction func buttonPressed(sender: UIButton) { highScore += 100 updateScoreLabel() } func updateScoreLabel() -> Void { let myString = NSString(format: "Highscore\n%i", highScore) let myMutableString = NSMutableAttributedString(string: myString as String, attributes: [NSFontAttributeName:UIFont(name: "Georgia", size: 20.0)!]) myMutableString.addAttribute(NSForegroundColorAttributeName, value: UIColor.greenColor(), range: NSRange(location:0,length:9)) label.attributedText = myMutableString } }

将字符串属性添加到动态标签

1 个答案: