Swift 显示alert

func Alert(title:String,msg:String)->Void{
        let alert = UIAlertController(title: title,message: msg,preferredStyle: UIAlertControllerStyle.alert)
        alert.addAction(UIAlertAction(title: "Ok",style: UIAlertActionStyle.default,handler: nil))
        self.present(alert,animated: true,completion: nil)
    }

let refreshAlert = UIAlertController(title: "",message: "Are you sure to continue?".localized(),preferredStyle: UIAlertControllerStyle.alert)
            
            refreshAlert.addAction(UIAlertAction(title: "Yes".localized(),style: .default,handler: { (action: UIAlertAction!) in
                // Cancel leave
                let result = ServiceProxy().CallCancelLeave(leaveId: self._leave.id)
                if(!result.isSuccess){
                    self.Alert(title: "Error".localized(),msg: result.errorMessage)
                }else{
                    // do nothing and navigate to the list view
                }
            }))
            
            refreshAlert.addAction(UIAlertAction(title: "No".localized(),style: .cancel,handler: { (action: UIAlertAction!) in
                // do nothing
            }))
            present(refreshAlert,completion: nil)