making levels in swift storyboard-CodePudding

I want to make an app where I create different levels by changing the speed. But I'm getting "Expected parameter type following ':'" error and I don't know how can I do this with using enum.

enum Difficulty {
    case easy(timeInterval: 1)
    case medium(timeInterval: 0.6)
    case hard(timeInterval: 0.3)

}
    
@IBAction func easyButton(_ sender: Any) {
  
}
@IBAction func mediumButton(_ sender: Any) {
}
@IBAction func hardButton(_ sender: Any) {
}
  
override func viewDidLoad() {
    super.viewDidLoad()
}

CodePudding user response：

You can't hardcode associated values for enum cases. Instead, declare a property that would return a desired value for each case:

enum Difficulty {
    case easy
    case medium
    case hard

    var timeInterval: TimeInterval {
        switch self {
        case .easy:
            return 1
        case .medium:
            return 0.6
        case .hard:
            return 0.3
        }
    }
}

Usage:

let difficulty: Difficulty = .easy
let timeInterval = difficulty.timeInterval

CodePudding user response：

Your code is not compiled because of wrong syntax. To solve your task you can inherit you enum from Double and use rawValue to get a difficulty value (https://docs.swift.org/swift-book/LanguageGuide/Enumerations.html#ID149).

enum Difficulty: Double {
    case easy = 1
    case medium = 0.6
    case hard = 0.3
}

let timeInterval = Difficulty.medium.rawValue
print(timeInterval) // Prints "0.6"