如何创建类型枚举的IBInspectable

问题描述

枚举 不是Interface Builder定义的运行时属性。
以下内容未在Interface Builder的Attributes Inspector中显示：

  enum StatusShape：Int {
 case Rectangle = 0 
 case Triangle = 1 
 case Circle = 2 
} 
 @IBInspectable var shape：StatusShape = .Rectangle 
  

从文档：
您可以将IBInspectable属性附加到类声明，类扩展或类别中的任何属性，以支持任何类型的支持通过Interface Builder定义的运行时属性：布尔值，整数或浮点数，字符串，本地化字符串，矩形，点，大小，颜色，范围和零。

问：如何在Interface Builder的属性检查器中看到枚举？

解决方案

Swift 3

@IBInspectable var shape：StatusShape =。 Rectangle 只是在Interface Builder中创建一个空白条目：

使用适配器，它将充当桥梁 Swift和Interface Builder之间。

shapeAdapter 可从IB检查：

  // IB：使用适配器
 @IBInspectable var shapeAdapter：Int {
 get {
 return self.shape.rawValue 
} 
 set （shapeIndex）{
 self.shape = StatusShape（rawValue：shapeIndex）?? .Rectangle 
} 
} 
  

上。

enum is not an Interface Builder defined runtime attribute.The following does not show in Interface Builder's Attributes Inspector:

enum StatusShape:Int {
    case Rectangle = 0
    case Triangle = 1
    case Circle = 2
}
@IBInspectable var shape:StatusShape = .Rectangle

From the documentation:You can attach the IBInspectable attribute to any property in a class declaration, class extension, or category for any type that’s supported by the Interface Builder defined runtime attributes: boolean, integer or floating point number, string, localized string, rectangle, point, size, color, range, and nil.

Q: How can I see an enum in Interface Builder's Attributes Inspector?

解决方案

Swift 3

@IBInspectable var shape:StatusShape = .Rectangle merely creates a blank entry in Interface Builder:

Use an adapter, which will acts as a bridge between Swift and Interface Builder.
shapeAdapter is inspectable from IB:

   // IB: use the adapter
   @IBInspectable var shapeAdapter:Int {
        get {
            return self.shape.rawValue
        }
        set( shapeIndex) {
            self.shape = StatusShape(rawValue: shapeIndex) ?? .Rectangle
        }
    }

Unlike the conditional compilation approach (using #if TARGET_INTERFACE_BUILDER), the type of the shape variable does not change with the target, potentially requiring further source code changes to cope with the shape:NSInteger vs. shape:StatusShape variations:

   // Programmatically: use the enum
   var shape:StatusShape = .Rectangle

Complete code

@IBDesignable
class ViewController: UIViewController {

    enum StatusShape:Int {
        case Rectangle
        case Triangle
        case Circle
    }

    // Programmatically: use the enum
    var shape:StatusShape = .Rectangle

    // IB: use the adapter
    @IBInspectable var shapeAdapter:Int {
        get {
            return self.shape.rawValue
        }
        set( shapeIndex) {
            self.shape = StatusShape(rawValue: shapeIndex) ?? .Rectangle
        }
    }
}

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