Swift创建可销毁单例

class AppManager {
    private static var _sharedInstance: AppManager?
     
    class func getSharedInstance() -> AppManager {
        guard let instance = _sharedInstance else {
            _sharedInstance = AppManager()
            return _sharedInstance!
        }
        return instance
    }
     
    private init() {} // 私有化init方法
     
    //销毁单例对象
    class func destroy() {
        _sharedInstance = nil
    }
}
 
//使用方式
AppManager.getSharedInstance()
AppManager.destroy()