Swift协议授权不起作用

Question

我的viewController containerView pageView。一旦我从pageView中滑动视图，我想在viewController中调用一个函数，我已尝试使用下面的代码，但它正在调用buttonMaskColor请问哪里会是我的问题？

class PlaceMenuDetailsViewController: UIViewController, PageViewSliderDelegate {

    override func viewDidLoad() {
        super.viewDidLoad()

        detailsButton.pageDelegation = self
    }

    func buttonMaskColor(){
        println("delegate work")
    }
}

class DetailPageViewController: UIPageViewController, UIPageViewControllerDelegate, UIPageViewControllerDataSource {

    weak var pageDelegation:PageViewSliderDelegate?

func pageViewController(pageViewController: UIPageViewController, viewControllerAfterViewController viewController: UIViewController) -> UIViewController? {

    pageDelegation?.buttonMaskColor()

    var page = (viewController as! PageDelegate).pageNumber + 1
    return viewControllerForPage(page)
}

Answer 1

在给出embed segue的标识符后，你应该在mainView的prepareForSegue函数中将self赋给pageDelegation，如下所示：

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {

    if segue.identifier == "embedSegueIdentifier" {

        let distinationVC = segue.destinationViewController as? DetailPageViewController

        distinationVC?.pageDelegation = self

    }

}