Accessing variables from another ViewController in Swift - ios

Question

I have the following ViewController:
class PageContentViewController: UIViewController {
var pageIndex: Int
}
How would I access pageIndex from another ViewController?
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?
}

Answer 1

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)
}
}
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

Answer 2

ViewController1.swift
class ViewController1: UIViewController {
struct GlobalVariable{
static var myString = String()
}
}
ViewController2.swift
class ViewController2: UIViewController
{
print(ViewController1.GlobalVariable.myString)
}

Answer 3

I solved this way . .
class StaticLinker
{
static var viewController : PageContentViewController? = nil
}
class PageContentViewController: UIViewController
{
var pageIndex: Int
StaticLinker.viewController = self
}
class AnotherClass
{
StaticLinker.viewController.pageIndex = 100
}

Answer 4

Here's my attempt to convert that code to swift:
func pageViewController(pageViewController: UIPageViewController!, viewControllerBeforeViewController viewController: UIViewController!) -> UIViewController! {
var pageController = viewController as PageContentViewController
var index: Int? = pageController.pageIndex
if var idx: Int = index{
if idx == 0{
return nil
}
else{
idx--
return viewControllerAtIndex(idx)
}
}
else{
return nil
}
}
class PageContentViewController: UIViewController {
var pageIndex: Int?
}

Answer 5

I was facing the same problem when i have to use token in every other class, the solution is pretty simple, What i did was
var access = LoginViewController()
token = access.token
but the problem it encountered was: Using the default value for token.
so i made that variable static and used this in view did load.
var token : String = ""
var access = LoginViewController.self
token = access.token

Answer 6

class color: UIViewController {
var blue:Int = 90
}
access it from other class (make sure to call the variable within a function otherwise you gonna get error )
class ViewController: UIViewController{
var example:color = color()
override func viewDidLoad() {
super.viewDidLoad()
// call it here
print(example.blue)
}
}

Answer 7

class firstViewController: UIViewController{
var variableName: variableType = variableValue
}
You can access this variable in the secondViewController by creating an instance of firstViewController()
class secondViewController: UIViewController{
var newVariableName = firstViewController()
}
later on use the newVariableName to access the value of the variableName
newVariableName.variableName