ios - 将每个 ChildViewController 上的数据传递到 UIPageViewController 上的下一个 ChildViewController

Question

我有一个来自 Realm 的对象，我将每个控件分配给对象，我想要的是将每个 childVC 上分配的每个对象传递给下一个 childVC。

我在 UIPageViewcontroller 上初始化了该对象:

var artist = Artist()

我使用此函数滚动到 nextViewController :

func scrollToViewController(index newIndex: Int) {
        if let firstViewController = viewControllers?.first,
            let currentIndex = orderedViewControllers.index(of: firstViewController) {
            let direction: UIPageViewControllerNavigationDirection = newIndex >= currentIndex ? .forward : .reverse
            let nextViewController = orderedViewControllers[newIndex]
            scrollToViewController(viewController: nextViewController, direction: direction)
        }
    }

我将每个文本框、标签分配给 childVC FirstViewController 上的该对象:

artist.artistName = textField.text!

下一个 childVC SecondViewvController 也是如此:

artist.genre = genres[0]

我想将我从前一个 VieController 分配的每个控制值传递给下一个 ViewController，例如:

在我的 SecondViewController 上，我希望将以前的值保存在 Artist.artistName 上，并分配我从标签获得的值。例如，只是打印 viewDidload 上的先前值。

class SecondViewController {
var artistNameFromFirstVC: String?
 override func viewDidLoad() {
        super.viewDidLoad()
        print("ArtisName: \(artistNameFromFirstVC)")
        // Setup Views
        setupCollectionView()
    }
...
}

我有超过 2 个子 Controller ，因此我想将每个先前的值传递给下一个 Controller 。

我很感激任何帮助。谢谢:)

Answer 1

有帮助吗？

struct Artist {
    var name: String
    var genre: String
}
class FirstViewController: UIViewController {
    var name:String?
}
class SecondViewController: UIViewController {
    var genre:String?
}
enum ScrollController: Int {
    case first = 0
    case second

    init(with index: Int) {
       self = ScrollController(rawValue: index) ?? .first
    }
    var controller: (Artist) -> UIViewController {
        return { artist in
            switch self {
            case .first:
                let controller = FirstViewController()
                controller.name = artist.name
                return controller
            case .second:
                let controller = SecondViewController()
                controller.genre = artist.genre
                return controller
            }
        }
    }
}
func scrollToViewController(index newIndex: Int) {
    if let firstViewController = viewControllers?.first,
        let currentIndex = orderedViewControllers.index(of: firstViewController) {
        let direction: UIPageViewControllerNavigationDirection = newIndex >= currentIndex ? .forward : .reverse
        let nextViewController = ScrollController(with: newIndex).controller
        scrollToViewController(viewController: nextViewController, direction: direction)
    }
}