将变量从一个 Swift 类传递到另一个的最佳方法? [英] Best way to pass variables from one Swift class to another?

问题描述

假设我在一个类中定义了变量，ViewController，并且想要从另一个类访问该变量，比如 BLEHandler.我该怎么做?我在使用 NSUserDefaults 时遇到了麻烦，所以除此之外的方法将不胜感激.

Suppose I define variable in one class, ViewController, and want to access that variable from another class, say BLEHandler. How do I go about doing that? I've had trouble with NSUserDefaults, so a method besides that would be greatly appreciated.

推荐答案

可以通过多种方式在 viewController 之间传递值例如

There are may ways you can pass value between viewControllers For example

• 为Segue做准备
• NSNotificationCenter
• 委托
• 单身

不同的情况使用不同的方式.

Different way is used in different case.

如果你使用prepareFoSegue-当你想在执行segue时传递

If you use prepareFoSegue- is used when you want to pass when perform segue

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
        //Use below to get reference,so that you can pass value
        //segue.destinationViewController 
        //segue.sourceViewController
}

如果您使用通知中心 - 盲通知，一个vc发送消息，可能不止一个接收.在发送消息 vc

If you use notificationcenter - blind notification,one vc send message,may more than one to receive. In send message vc

    NSNotificationCenter.defaultCenter().postNotificationName(, object: )

在接收消息vc中先注册

In receive message vc Register first

    NSNotificationCenter.defaultCenter().addObserver(, selector: , name: , object: )

比你从选择器中得到的值

Than you get the value from the selector

不要忘记删除

    NSNotificationCenter.defaultCenter().removeObserver(, name: , object:  )

如果您使用委托 - 接收方和发送方首先建立连接.可能有关于此的帖子，我不会发布示例.

If you use delegate - the receiver and sender has a connection first. There are may post about this,I will not post example.

如果你使用单例 - 你必须清楚单例的生命周期.我不建议以这种方式传递值.

If you use singleton - you have to be clear about the life circle of singleton. I do not suggest to pass value in this way.

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