从Swift中的另一个ViewController访问变量 [英] Accessing variables from another ViewController in Swift

问题描述

我有以下 ViewController ：

class PageContentViewController: UIViewController {

    var pageIndex: Int

}

我如何从另一个ViewController访问 pageIndex ？

How would I access pageIndex from another ViewController?

我需要访问 pageIndex 在这个函数中：

I need to access pageIndex in this function:

func pageViewController(pageViewController: UIPageViewController!, viewControllerBeforeViewController viewController: UIViewController!) -> UIViewController! {

    //var index: Int
    //index = ?

    NSUInteger index = ((PageContentViewController*) viewController).pageIndex; // in Swift?

    if ((index == 0) || (index == NSNotFound)) {
        return nil;
    }

    index--;

    return [self viewControllerAtIndex:index]; // in Swift?
}

推荐答案

swift中默认的一切都是public，因此如果你声明这样的东西：

Everything by default in swift is public, and thus if you declare something like this:

class SomeViewController: UIViewController {
    var someVariable: SomeType = someValue

    init(nibName nibNameOrNil: String?, bundle nibBundleOrNil: NSBundle?) {
        super.init(nibName: nibNameOrNil, bundle: nibBundleOrNil)
    }
}

只要你有一个实例，你就可以访问它：

You can access it as long as you have an instance of it:

var myCustomViewController: SomeViewController = SomeViewController(nibName: nil, bundle: nil)
var getThatValue = myCustomViewController.someVariable

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