Swift 3通过一系列Segues / ViewControllers传递var [英] Swift 3 passing var through a series of Segues / ViewControllers

问题描述

我将一个意想不到的问题通过Segue传递给VC。在目标C和早期版本的Swift中工作得很好。这是我在做什么：

I am having an unexpected problem passing var's through Segue to a VC. Worked fine in Objective C and early version of Swift. Here is what I am doing:

我从一个下载的json文件中提取一组变量来填充一个TableViewCell，然后将Cell显示的变量加上另外一个与该细胞选择相关的vars到DetailViewController。这是通过准备Segue，在DetialViewController上设置vars。然后destination.myVarToSend = myVar .....

I'm extracting a set of variables from a downloaded json file to populate a TableViewCell, then to pass the Cell displayed variables plus the other vars relating to that Cell selection to a DetailViewController. This is through prepare for Segue, setting up vars on the DetialViewController. Then destination.myVarToSend = myVar .....

这一切都很好。

但是，我想将这两个变量从DetailVC传递给ThirdViewController。我像以前一样设置好了，但是在ThirdViewController的变量中我没有一个？有任何想法吗？有没有我缺少的东西？

However, I want to pass on two of those variables from the DetailVC to a ThirdViewController. I set it all up as before, but I get a nil in the variable on the ThirdViewController?? Any ideas? Is there something I am missing?

ThirdViewController实际上是一个MapView，我传递的vars是Double。尝试通过那些没有工作，所以在我正在尝试和尝试对String vars做同样的时刻。 （当然我将json文件中的数据更改为文本字符串）。

The ThirdViewController is actually a MapView and the vars I am passing are Double. Attempts at passing those did not work so at the moment I am experimenting and trying to do the same with String vars. (Of course I changed the data in the json file to text strings).

我现在不会发布任何代码，因为它是所有标准的东西，但可以如果需要的话
:-)

I'm not posting any code at the moment as it is all standard stuff, but can do if required. :-)

非常感谢

推荐答案

只是找到一个类似的问题的答案，对我来说可以正常工作：如何在Swift中的视图控制器之间传递数据？

I just found the answer on a similar question which works fine for me, at : How do you pass data between view controllers in Swift?

 final class Shared {
 static let shared = Shared() //lazy init, and it only runs once

 var stringValue : String!
 var boolValue   : Bool!
}
To set stringValue

Shared.shared.stringValue = "Hi there"
to get stringValue

if let value = Shared.shared.stringValue {
    print(value)
}

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