swift - 在 Swift 中仅颜色下划线

Question

如何更改标签中下划线的颜色？我只想改变下划线的颜色，而不是整个文本。

我已经使用此代码来获得下划线:

let underlineAttribute = [NSAttributedStringKey.underlineStyle: NSUnderlineStyle.styleSingle.rawValue]
let underlineAttributedString = NSAttributedString(string: "\(nearSavings[indexPath.row]) ,-", attributes: underlineAttribute)
cell.detailTextLabel?.attributedText = underlineAttributedString

但我找不到设置下划线颜色的代码。任何人都可以提供帮助？

Answer 1

Swift 4 解决方案

您必须将 NSAttributedString 与作为 [NSAttributedStringKey : Any] 的属性数组一起使用。

示例代码:

导入 UIKit

class ViewController: UIViewController {

    @IBOutlet weak var myLabel: UILabel!

    override func viewDidLoad() {
        super.viewDidLoad()

        // Colored Underline Label
        let labelString = "Underline Label"
        let textColor: UIColor = .blue
        let underLineColor: UIColor = .red
        let underLineStyle = NSUnderlineStyle.styleSingle.rawValue

        let labelAtributes:[NSAttributedStringKey : Any]  = [
            NSAttributedStringKey.foregroundColor: textColor,
            NSAttributedStringKey.underlineStyle: underLineStyle,
            NSAttributedStringKey.underlineColor: underLineColor
        ]

        let underlineAttributedString = NSAttributedString(string: labelString,
                                                           attributes: labelAtributes)

        myLabel.attributedText = underlineAttributedString
    }

}