Swift的单例模式写法

发布时间：2020-12-14 01:58:41 所属栏目：百科来源：网络整理

导读：Approach B: Nested struct class SingletonB { class var sharedInstance: SingletonB { struct Static { static let instance: SingletonB = SingletonB() } return Static.instance } } Approach C: dispatch_once class SingletonC { class var sharedIn

Approach B: Nested struct

class SingletonB {
    
    class var sharedInstance: SingletonB {
        struct Static {
            static let instance: SingletonB = SingletonB()
        }
        return Static.instance
    }
    
}

Approach C: dispatch_once

class SingletonC {
    
    class var sharedInstance: SingletonC {
        struct Static {
            static var onceToken: dispatch_once_t = 0
            static var instance: SingletonC? = nil
        }
        dispatch_once(&Static.onceToken) {
            Static.instance = SingletonC()
        }
        return Static.instance!
    }
}

（编辑：李大同）

【声明】本站内容均来自网络，其相关言论仅代表作者个人观点，不代表本站立场。若无意侵犯到您的权利，请及时与联系站长删除相关内容!