Ios 在枚举案例中嵌入更多数据

我有以下叠瓦枚举

public enum Icons {
    public enum Arrow: String {
        case Angle1 = "\u{f100}"
        case Angle2 = "\u{f101}"
        case Angle3 = "\u{f102}"
        case Angle4 = "\u{f103}"
        case ArrowBottomLeft = "\u{f104}"
        case ArrowBottomRight = "\u{f105}"
    }

    public enum Clothing: String {
        case BallCap = "\u{f100}"
        case Belt = "\u{f101}"
        case Boot = "\u{f102}"
        case BowTie = "\u{f103}"
    }

    public enum Emotions: String {
        case Angel = "\u{f100}"
        case AngrySick = "\u{f101}"
        case Angry = "\u{f102}"
        case Bitter = "\u{f103}"
        case Concerned = "\u{f104}"
        case Cool = "\u{f105}"
    }
}

我有一个巨大的图标集合，我想集成到我的应用程序中。我还有一个UIImage扩展初始值设定项，它将UIFont作为参数，并为要绘制的图标指定一个字符串（源于

Icons.Category.Icons

——注意，在本例中，类别是箭头、衣服或情感）

要获取图标，请调用：

let image = UIImage(  
                      fromIcon: Icons.Emotions.Angel.rawValue, 
                      withFont: UIFont.iconFontAngel(22)
                   )

三种图标中的每一种都有关联的UIFont扩展名：

• 箭头类型有

  UIFont.icontarrow（大小）

• 服装类型有

  UIFont.icontClothing（尺码）

• 情感类型有

  UIFont.iconContemotions（大小）

如何更好地声明图标以包括UIFont、字体大小和其他类别特定选项，因为我确切地知道每个类别对应的UIFont，并且我只需将单个参数（如

Icons.Arrow.Angle3

）传递给UIImage初始值设定项并从该参数中提取字符串，UIFont和其他需要的选项

---

我正在考虑将图标类型声明为set，但我不确定如何以干净的方式解决此问题。

不要为此使用枚举。使用结构

public struct FontBasedIcon {

    private init(string: String, fontName: String) {
        self.string = string
        self.fontName = fontName
    }

    public let string: String
    public let fontName: String

    public func font(size size: CGFloat) -> UIFont {
        return UIFont(name: fontName, size: size)!
    }

    public func image(fontSize fontSize: CGFloat) -> UIImage {
        let string = self.string as NSString
        let attributes = [ NSFontAttributeName: self.font(size: fontSize) ]
        var rect = string.boundingRectWithSize(CGSizeMake(CGFloat.infinity, CGFloat.infinity), options: .UsesLineFragmentOrigin, attributes: attributes, context: nil)
        let size = CGSizeMake(ceil(rect.width), ceil(rect.height))
        UIGraphicsBeginImageContextWithOptions(size, false, 0)
        defer { UIGraphicsEndImageContext() }
        string.drawAtPoint(CGPoint.zero, withAttributes: attributes)
        return UIGraphicsGetImageFromCurrentImageContext()
    }

}

然后将常量声明为静态属性：

public extension FontBasedIcon {
    public struct Arrow {
        public static let Angle1 = FontBasedIcon(string: "\u{f100}", fontName: "ArrowFont")
        public static let Angle2 = FontBasedIcon(string: "\u{f101}", fontName: "ArrowFont")
        // etc.
    }

    public struct Emotion {
        public static let Angel = FontBasedIcon(string: "\u{f100}", fontName: "EmotionFont")
        public static let AngrySick = FontBasedIcon(string: "\u{f101}", fontName: "EmotionFont")
        // etc.
    }
}

用法：

let angelImage = FontBasedIcon.Emotion.Angel.image(fontSize: 22)

---

不要为此使用枚举。使用结构

public struct FontBasedIcon {

    private init(string: String, fontName: String) {
        self.string = string
        self.fontName = fontName
    }

    public let string: String
    public let fontName: String

    public func font(size size: CGFloat) -> UIFont {
        return UIFont(name: fontName, size: size)!
    }

    public func image(fontSize fontSize: CGFloat) -> UIImage {
        let string = self.string as NSString
        let attributes = [ NSFontAttributeName: self.font(size: fontSize) ]
        var rect = string.boundingRectWithSize(CGSizeMake(CGFloat.infinity, CGFloat.infinity), options: .UsesLineFragmentOrigin, attributes: attributes, context: nil)
        let size = CGSizeMake(ceil(rect.width), ceil(rect.height))
        UIGraphicsBeginImageContextWithOptions(size, false, 0)
        defer { UIGraphicsEndImageContext() }
        string.drawAtPoint(CGPoint.zero, withAttributes: attributes)
        return UIGraphicsGetImageFromCurrentImageContext()
    }

}

然后将常量声明为静态属性：

public extension FontBasedIcon {
    public struct Arrow {
        public static let Angle1 = FontBasedIcon(string: "\u{f100}", fontName: "ArrowFont")
        public static let Angle2 = FontBasedIcon(string: "\u{f101}", fontName: "ArrowFont")
        // etc.
    }

    public struct Emotion {
        public static let Angel = FontBasedIcon(string: "\u{f100}", fontName: "EmotionFont")
        public static let AngrySick = FontBasedIcon(string: "\u{f101}", fontName: "EmotionFont")
        // etc.
    }
}

用法：

let angelImage = FontBasedIcon.Emotion.Angel.image(fontSize: 22)

---

如果要包含大小，可以将结构与叠瓦枚举和大小值一起使用。实际上，您可以使用内省来确定使用哪个UIFont。例如（

let icon=Icons.Arrow.Angle3；icon为Icons.Clothing//将返回true，而icon为Icons.Mootions//将返回false

）如果要包含尺寸，可以使用具有重叠枚举和尺寸值的结构。实际上，您可以使用内省来确定使用哪个UIFont。例如（

let icon=Icons.Arrow.Angle3；icon为Icons.Clothing//将返回true，而icon为Icons.Emotions//将返回false

）