从子uiviewcontroller调用父uiviewcontroller方法 [英] calling a parent uiviewcontroller method from a child uiviewcontroller

问题描述

我有一个父UIViewController，它打开一个子UIViewController：

I have a Parent UIViewController, which opens a child UIViewController:

let storyboard = UIStoryboard(name: "Main", bundle: nil)
let vc = storyboard.instantiateViewControllerWithIdentifier("myChildView") as! UIViewController
self.presentViewController(vc, animated: true, completion: nil)

我按ChildView中的一个按钮应关闭ChildView并在父视图中调用方法：

I press a Button in the ChildView which should close the the ChildView and call a method in the Parent View:

self.dismissViewControllerAnimated(true, completion: nil)
CALL PARENTS METHOD  ??????

怎么做？
我找到了一个很好的答案（链接到好的答案 ），但我不确定这是否是UIViewControllers的最佳实践。有人可以帮忙吗？

How to do that ? I found a good answer (Link to good answer), but I am not sure if this is the best practice with UIViewControllers. Can someone help ?

推荐答案

一种简单的方法可以使用 NSNotificationCenter 为此。

One easy way to achieve this you can use NSNotificationCenter for that.

在 ParentViewController 中将其添加到 viewDidLoad 方法：

override func viewDidLoad() {
    super.viewDidLoad()
    NSNotificationCenter.defaultCenter().addObserver(self, selector: "refreshList:", name:"refresh", object: nil)
}

之后在 ParentViewController 中添加此函数，当您解除 ChildViewController ：

After that add this function in ParentViewController which will get called when you dismiss your ChildViewController:

func refreshList(notification: NSNotification){

    println("parent method is called")
}

并进入你的 ChildViewController 在解除子视图的地方添加此代码：

and into your ChildViewController add this code where you dismissing your child view:

 @IBAction func btnPressed(sender: AnyObject) {

    NSNotificationCenter.defaultCenter().postNotificationName("refresh", object: nil)
    self.dismissViewControllerAnimated(true, completion: nil)
}

现在，当您解除子视图 refreshList 时，将调用该方法。

Now when you dismiss child view refreshList method will be call.

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