预期 { 在函数声明的主体中 | Swift | Xcode 7.2.1

Question

我实施后

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


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

Xcode 告诉我这个错误：

Expected '{' in body of function declaration

http://i.stack.imgur.com/315n9.png

希望大家帮帮我

Answer 1

这两个函数都需要一个闭包，returns 一个 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

}