ios - 是否可以在 Swift 中连接变量名和字符串/整数？

Question

在 Javascript 或 jQuery 中，可以像这样连接字符串和变量名:

var id = 5;
$("#wrapper_" + id).hide();

我想用 Swift 达到同样的效果，比如:

func eventColors (colorID: Int, view: UIView) {
    view.backgroundColor = Constants.Color.eventColor + colorID // Incorrect
}

常量结构:

struct Constants {

   struct Color {
      static let eventColor1: UIColor = UIColor(red:0.06, green:0.44, blue:0.64, alpha:1)
      static let eventColor2: UIColor = UIColor(red:0.86, green:0.30, blue:0.99, alpha:1)
      static let eventColor3: UIColor = UIColor(red:0.50, green:0.44, blue:0.64, alpha:1)
   }

}

Answer 1

您不能在 Swift 中即时创建变量名。您应该考虑在此处使用数组。使 eventColor 成为颜色数组:

struct Constants {

    struct Color {
        static let eventColor: [UIColor] = [
            UIColor(red:0.06, green:0.44, blue:0.64, alpha:1),
            UIColor(red:0.86, green:0.30, blue:0.99, alpha:1),
            UIColor(red:0.50, green:0.44, blue:0.64, alpha:1)
        ]
    }

}

然后像这样选择你的颜色:

view.backgroundColor = Constants.Color.eventColor[colorID - 1]