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swift 中如何使用带参数的单例

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前言

swift 中如何使用带参数的单例

步骤

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private class SingletonSetupHelper {
    var param:String?
}

class MySingleton {
    static let shared = MySingleton()
    private static let setup = SingletonSetupHelper()

    class func setup(param:String){
        MySingleton.setup.param = param
    }

    private init() {
        let param = MySingleton.setup.param
        guard param != nil else {
            fatalError("Error - you must call setup before accessing MySingleton.shared")
        }

        //Regular initialisation using param
    }
}

初始化单例的时候要先设置 SingletonSetupHelper 否则会出现 fatalError

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MySingleton.setup(param:"MyParam")

正常使用单例

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MySingleton.shared()

参考

https://stackoverflow.com/a/40464136/4256995