Ios 预期{在函数体声明中| Swift | Xcode 7.2.1

在我实施之后

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


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

Xcode告诉我这个错误：

函数体声明中应为“{”

---

我希望你们能帮助我

这两个函数都希望在结束后返回UIViewController？您只需要包括以下内容：

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

return //name of your viewController
}

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

return //name of your viewController

}

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在了解中，您是swift的新开发人员。如果您先完整地学习swift，将会更好。您在这里没有任何方法体