从Swift中的另一个ViewController访问变量

Question

我有以下内容ViewController:

class PageContentViewController: UIViewController {

    var pageIndex: Int

}

我如何pageIndex从另一个ViewController 访问？

我需要访问pageIndex此功能:

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?
}

Answer 1

默认情况下,swift中的所有内容都是公共的,因此如果您声明这样的内容:

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:

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

Answer 2

ViewController1.swift

class ViewController1: UIViewController {

    struct GlobalVariable{
        static var myString = String()
    }
}

ViewController2.swift

class ViewController2: UIViewController 
{

print(ViewController1.GlobalVariable.myString)

}

Answer 3

我解决了这种方式。。

class StaticLinker
{
     static var viewController : PageContentViewController? = nil
}

class PageContentViewController: UIViewController
{

    var pageIndex: Int
    StaticLinker.viewController = self
}

class AnotherClass
{
    StaticLinker.viewController.pageIndex = 100
}