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创建一个以uiviewcontroller作为参数的函数

presentviewcontroller uiviewcontroller swift ios

-1

SwiftyJD · 技术社区 · 7 年前

我试图创建一个以uiviewcontroller为函数的函数。原因是可以传递多个自定义viewcontrollers。下面是我的当前函数,它可以工作,但使用switch语句和枚举:

enum controllerTypes {
    case First, Second
}

extension UIViewController {

    func presentViewController(storyBoardName: String, storyBoardIdentifier: String, controllerType: controllerTypes, completion:(() -> Void)?) {

        switch controllerType {

        case .First:
            let firstVC = UIStoryboard(name: storyBoardName, bundle: nil).instantiateViewController(withIdentifier: storyBoardIdentifier) as? FirstViewController
            if let firVC = firstVC {
                self.present(firVC, animated: true, completion: nil)
            }
        case .Second:
            let secondVC = UIStoryboard(name: storyBoardName, bundle: nil).instantiateViewController(withIdentifier: storyBoardIdentifier) as? SecondViewController
            if let secVC = secondVC {
                self.present(secVC, animated: true, completion: nil)
            }
        }
        completion?()
    }
}

我不想为参数传递'controllerTypes'枚举,而是要传递任何类型的uiviewcontroller,当我尝试执行此操作时,出现以下错误:

        func presentViewController(storyBoardName: String, storyBoardIdentifier: String, controllerType: UIViewController, completion:(() -> Void)?) {
            let sampleVC = UIStoryboard(name: storyBoardName, bundle: nil).instantiateViewController(withIdentifier: storyBoardIdentifier) as? controllerType//error - use of undeclared type 'controllerType'
            if let samVC = sampleVC {
                self.present(samVC, animated: true, completion: nil)
            }
}

你知道这样做是否可行吗?

1 回复 | 直到 7 年前

dan 7 年前

必须使函数成为泛型,然后强制转换为泛型参数类型:

extension UIViewController {
    func presentViewController<T: UIViewController>(storyBoardName: String, storyBoardIdentifier: String, controllerType: T.Type, completion:(() -> Void)?) {
        let sampleVC = UIStoryboard(name: storyBoardName, bundle: nil).instantiateViewController(withIdentifier: storyBoardIdentifier) as? T
        if let samVC = sampleVC {
            self.present(samVC, animated: true, completion: completion)
        }
    }
}

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