Question

我有一个数组UIButton，它们具有唯一的tag值。当按下给定的按钮时，我要加载并显示一个UIViewController，它也存储在等长数组中。

要显示的UIViewController是UIViewController的子类的子类：

class AViewController: UIViewController {}
class BViewController: AViewController {}
class CViewController: AViewController {}
class DViewController: AViewController {}
// ... etc.

我尝试使用以下方法存储AViewController子类的数组：

private var array: [AViewController] = [BViewController.self, CViewController.self, DViewController.self]

但是出现错误无法将第一个元素的类型'[BViewController] .Type'的值转换为指定的类型'[AViewController]'。

然后我将使用以下内容显示BViewController（例如）：

let ViewController = array[button.tag].self
var viewController: AViewController
viewController = ViewController.init()
viewController.transitioningDelegate = self
viewController.modalPresentationStyle = .custom
present(viewController, animated: true)

请告诉我这是否是做这样的事情的不正确的思维过程，并感谢您的帮助。

Answer 1

您需要实例

private var array: [AViewController] = [BViewController(), CViewController(), DViewController()]

如果vcs在IB中，那么您会这样做

let b = self.storyboard!.instantiateViewController(withIdentifier: "bID") as! BViewController
let c = self.storyboard!.instantiateViewController(withIdentifier: "cID") as! CViewController 
let d = self.storyboard!.instantiateViewController(withIdentifier: "dID") as! DViewController

然后

array = [b,c,d]

Answer 2

lazy var VCArray :[UIViewController] = {
    return [VCinst(name: "firstVC"),VCinst(name: "secondVC"), VCinst(name: "thirdVC")]
}()

func VCinst(name:String) -> UIViewController {
       return UIStoryboard(name: "Main", bundle: nil).instantiateViewController(identifier: name)
}

iOS（Swift）-UIViewControllers数组

2 个答案: