ios - 我怎样才能用带有 UILabel 的 NSAttributedString 进行描边和填充

Question

是否可以同时应用笔画和填充anNSAttributedString和 a UILabel？

Answer 1

是的，关键是将负值应用于NSStrokeWidthAttributeName 如果此值为正，您将只看到描边而不是填充。

目标-C：

self.label.attributedText=[[NSAttributedString alloc] 
initWithString:@"string to both stroke and fill" 
attributes:@{
             NSStrokeWidthAttributeName: @-3.0,
             NSStrokeColorAttributeName:[UIColor yellowColor],
             NSForegroundColorAttributeName:[UIColor redColor]
             }
];

感谢下面的@cacau：另请参阅技术问答 QA1531

斯威夫特 4版本：

let attributes: [NSAttributedStringKey : Any] = [.strokeWidth: -3.0,
                                                 .strokeColor: UIColor.yellow,
                                                 .foregroundColor: UIColor.red]

label.attributedText = NSAttributedString(string: text, attributes: attributes)

斯威夫特 5.1版本：

let attributes: [NSAttributedString.Key : Any] = [.strokeWidth: -3.0,
                                                  .strokeColor: UIColor.yellow,
                                                  .foregroundColor: UIColor.red]

label.attributedText = NSAttributedString(string: text, attributes: attributes)

Answer 2

斯威夫特版本：

let attributes = [NSStrokeWidthAttributeName: -3.0,
                      NSStrokeColorAttributeName: UIColor.yellowColor(),
                      NSForegroundColorAttributeName: UIColor.redColor()];

label.attributedText = NSAttributedString(string: "string to both stroke and fill", attributes: attributes)

斯威夫特 3版本：

    let attributes = [NSStrokeWidthAttributeName: -3.0,
                      NSStrokeColorAttributeName: UIColor.yellow,
                      NSForegroundColorAttributeName: UIColor.red] as [String : Any]

    label.attributedText = NSAttributedString(string: "string to both stroke and fill", attributes: attributes)

Answer 3

现在最新的 swift 苹果删除属性键值声明的 [String: Any] 用作 [NSAttributedStringKey : Any]

    let strokeTextAttributes = [
        NSAttributedStringKey.strokeColor : UIColor.green,
        NSAttributedStringKey.foregroundColor : UIColor.lightGray,
        NSAttributedStringKey.strokeWidth : -4.0,
        NSAttributedStringKey.font : UIFont.boldSystemFont(ofSize: 52)
        ] as [NSAttributedStringKey : Any]

    hello_cell_lb.attributedText = NSAttributedString(string: "\(hello_array[indexPath.row])", attributes: strokeTextAttributes)

谢谢你

Answer 4

斯威夫特 4版本：

let attributes: [NSAttributedStringKey : Any] = [.strokeWidth: -3.0,
                                                 .strokeColor: UIColor.yellow,
                                                 .foregroundColor: UIColor.red]

label.attributedText = NSAttributedString(string: text, attributes: attributes)

Answer 5

这是 UITextView 中的 Stroke 和 Oblique/tilt/slant 文本的示例

    public func setAttributedText(fontStyle: INSTextFontPickerStyle, strokeColor: UIColor = UIColor.white, foregroundColor: UIColor = UIColor.black, isObliqueness: Bool = false, isStrokes: Bool = false) {
        self.fontStyle = fontStyle

        let paragraphStyle = NSMutableParagraphStyle()
        paragraphStyle.alignment = innterTextView.textAlignment

        // Tilting the text
        let obliquenessValue = isObliqueness ? NSNumber(value: 0.2) : NSNumber(value: 0) // The angle of tilting in clockwise

        // Stroke a line in text edges
        var strokeWidth = NSNumber(value: 0.0)
        var _strokeColor = UIColor.clear
        if isStrokes || fontStyle == .strokeEdges {
            strokeWidth = NSNumber(value: -2.0) // The width of stroke
            _strokeColor = strokeColor
        }
        
        textView.attributedText = NSAttributedString(string: textView.text, attributes: [
            NSAttributedString.Key.foregroundColor : foregroundColor,
            NSAttributedString.Key.font : UIFont.systemFont(ofSize: (actualFontSize > 0 ? actualFontSize : fontSize)),
            NSAttributedString.Key.paragraphStyle : paragraphStyle,
            NSAttributedString.Key.strokeColor : _strokeColor,
            NSAttributedString.Key.strokeWidth : strokeWidth,
            NSAttributedString.Key.obliqueness: obliquenessValue
        ])
    }