ios – 从Swift的另一个ViewController访问变量

我有以下ViewController：

class PageContentViewController: UIViewController {

    var pageIndex: Int

}

如何从另一个ViewController访问pageIndex？

我需要在此功能中访问pageIndex：

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?
}

解决方法

swift中默认的一切都是公开的,因此如果你声明如下：

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,你可以访问它：

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