NSAttributedString 和 Button 的问题

Question

我正在尝试使用 NSAttributedString 更新按钮标题字段。所以我尝试设置属性标题，但它无法正常工作。它不显示我放入 NSAttributedString 中的正确属性。我得出的结论是我初始化 NSAttributedString 的方法不正确，或者按钮覆盖了颜色。

我得到了字符串的原始值，但没有属性值。

卡片结构

struct Card {
    private var shape : Shape = Shape.none
    private var color : Color = Color.none
    private var number : Number = Number.none
    private var shading : Shading = Shading.none
    //These attributes are not showing up
    private var strokeTextAttributes : [NSAttributedStringKey:Any] = [NSAttributedStringKey:Any]() 
    private var manipulatedValue : String = ""

    init(shape : Shape, color : Color, number : Number, shading : Shading){
        self.shape = shape
        self.color = color
        self.number = number
        self.shading = shading
        //How many multiples of the shape should be on the card
        for _ in 1...number.rawValue{
            manipulatedValue.append(shape.rawValue)
        }
        //0 is the NSStringKey, 1 is the UIColor
        strokeTextAttributes[color.rawValue.0] = color.rawValue.1
    }

    func rawValue() -> NSAttributedString{
        return NSAttributedString(string: manipulatedValue, attributes: strokeTextAttributes)
    }
}

ViewController Class

class ViewController: UIViewController {
    private var game : Set = Set()

    override func viewDidLoad() {
        super.viewDidLoad()

        for index in 0...game.cardsInPlay.count-1{
            cardButtons[index].layer.borderWidth = 3.0
            cardButtons[index].layer.borderColor = UIColor.black.cgColor
            cardButtons[index].layer.cornerRadius = 8.0
            cardButtons[index].setAttributedTitle(game.cardsInPlay[index]!.rawValue(), for: UIControlState.normal)
        }
    }

    @IBOutlet var cardButtons: [UIButton]!
}

我尝试将这些值硬编码到 Card 结构的初始值设定项中。但同样的情况会再次发生。该按钮显示卡片和数字的正确形状，但不是正确的颜色。该颜色将是 Main.Storyboard 检查器中的默认颜色。浅蓝。问题是字典不工作，因此 strokeTextAttributes 不包含任何有意义的内容，或者 UIButton 正在做一些愚蠢的事情。

Answer 1

您正在设置 NSAttributedStringKey.strokeColor，但您没有设置 NSAttributedStringKey.strokeWidth。这就是为什么你没有得到想要的结果。
如果它不存在，我想（这完全有意义）将 .strokeWidth 设置为 0 是一样的，这在文档 "doing nothing":

中有说明

Specify 0 (the default) for no additional changes

通过将其设置为 0 或根本不设置，我得到了相同的结果。

示例测试代码：

let str = "Hello !"
let attributedString = NSMutableAttributedString.init(string: str,
                                                      attributes: [.font: UIFont.systemFont(ofSize: 40),
                                                                   .foregroundColor: UIColor.white])

let label1 = UILabel(frame: CGRect(x: 30, y: 40, width: 200, height: 50))
label1.backgroundColor = .lightGray
label1.attributedText = attributedString

let label2 = UILabel(frame: CGRect(x: 30, y: 95, width: 200, height: 50))
label2.backgroundColor = .lightGray
label2.attributedText = attributedString


let label3 = UILabel(frame: CGRect(x: 30, y: 150, width: 200, height: 50))
label3.backgroundColor = .lightGray
label3.attributedText = attributedString

let label4 = UILabel(frame: CGRect(x: 30, y: 205, width: 200, height: 50))
label4.backgroundColor = .lightGray
label4.attributedText = attributedString

attributedString.addAttributes([NSAttributedStringKey.strokeColor: UIColor.red],
                               range: NSRange.init(location: 0, length: attributedString.string.utf16.count))
label2.attributedText = attributedString
print("Only Stroke Color:\n\(attributedString)")

attributedString.addAttributes([NSAttributedStringKey.strokeWidth: 0],
                               range: NSRange.init(location: 0, length: attributedString.string.utf16.count))
label3.attributedText = attributedString
print("Stroke Color + Width set to 0:\n\(attributedString)")

attributedString.addAttributes([NSAttributedStringKey.strokeWidth: -4],
                               range: NSRange.init(location: 0, length: attributedString.string.utf16.count))
label4.attributedText = attributedString
print("Stroke Color + Width set to -4:\n\(attributedString)")

self.view.addSubview(label1)
self.view.addSubview(label2)
self.view.addSubview(label3)
self.view.addSubview(label4)

日志输出：

$>Only Stroke Color:
Hello !{
    NSColor = "UIExtendedGrayColorSpace 1 1";
    NSFont = "<UICTFont: 0x7f8973e11120> font-family: \".SFUIDisplay\"; font-weight: normal; font-style: normal; font-size: 40.00pt";
    NSStrokeColor = "UIExtendedSRGBColorSpace 1 0 0 1";
}
$>Stroke Color + Width set to 0:
Hello !{
    NSColor = "UIExtendedGrayColorSpace 1 1";
    NSFont = "<UICTFont: 0x7f8973e11120> font-family: \".SFUIDisplay\"; font-weight: normal; font-style: normal; font-size: 40.00pt";
    NSStrokeColor = "UIExtendedSRGBColorSpace 1 0 0 1";
    NSStrokeWidth = 0;
}
$>Stroke Color + Width set to -4:
Hello !{
    NSColor = "UIExtendedGrayColorSpace 1 1";
    NSFont = "<UICTFont: 0x7f8973e11120> font-family: \".SFUIDisplay\"; font-weight: normal; font-style: normal; font-size: 40.00pt";
    NSStrokeColor = "UIExtendedSRGBColorSpace 1 0 0 1";
    NSStrokeWidth = "-4";
}

渲染：

NSAttributedString 和 Button 的问题

Issues with NSAttributedString and Button

uibutton

nsattributedstring

ios

swift

nsattributedstringkey