Swift 3.0 enum 的灵活使用介绍

typedef NS_ENUM(NSUInteger, UserType) {
  UserTypeStudent,
  UserTypeTeacher,
  UserTypeStaff,
  UserTypeAdministrator,
  UserTypeOther
};

  {
    "successful": true,
    "userType": 0 // 可能为其他的值
  }

enum CIBlurStyle: String{
  case extraLight = "extraLight"
  case light   = "light"
  case dark    = "dark"

enum CIBlurHUDType {
  case guide(Bool)
  case info(String)
  case error(Error)
  case other
}


func handleEnum(hudType: CIBlurHUDType) -> Void {
    switch hudType {
        case .guide(let isAutoHide):
          // 
        case .info(let tip):
          // 提示信息
        case .error(let error):
          // 对 `error` 做处理
        default:
          break
        }
}

// 如何使用
handleEnum(.info("这是一段提示文字~"))

let err = NSError.init(domain: "发生了一些不为人知的错误", code: 110, userInfo: nil)
handleEnum(.error(err))

public enum CIImageOperation {
  case cornerRadius(CGFloat)
  case scale(CGSize)
  case zip(CGFloat)
  case other
}

extensin UIImageView {
  func setImage(with url: URL, cornerRadius: CGFloat) -> Void {}
  func setImage(with url: URL, scaleTo: CGSize) -> Void {}
  func setImage(with url: URL, zip: (Bool, CGFLoat)) -> Void {}
}

extension UIImageView {
  func setImage(with url: URL, imageOperation: CIImageOperation) -> Void {
    // 下载完图片对图片进行处理
    switch imageOperation {
        case .cornerRadius(let cornerRadius):
          // 切圆角
        case .scale(let size):
          // 尺寸缩放
        case .zip(let zipValue):
          // 图片清晰度的压缩比例
        default:
          break
        }
  }
}

// 使用
imagView.setImage(with url: "www.codeinventor.club", imageOperation: .cornerRadius(3.0))

enum CIUrlResponse {
  case Result(Any)
  case error(NSError)
}

func getData(with url: URL) -> CIUrlResponse {}

enum HUDStyle {
    case loading(Bool, CGFloat, CGFloat, String)
    case other(((Bool) -> ()))
  }