swift enum 使用rawValue

1. 定义enum

@objc public enum DMRootViewBottomItemType: Int32 {
    case Borrow = 0, Return, Buy, Near
}

2.定义变量

let type = DMRootViewBottomItemType.Borrow

3.取出rawValue

item.tag = Int(type.rawValue)

4.将tag值转换成DMRootViewBottomItemType类型

let newType = DMRootViewBottomItemType(rawValue: Int32(item.tag))