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學習swift此刻，任何幫助將不勝感激 - 更新代碼從swift 3到swift 4 - 在構建時獲取以下錯誤：參數標籤'（_ :, viewControllerAfterViewController :)'不匹配任何可用的重載
參數標籤 '（_ :, viewControllerAfterViewController :)' 不匹配任何可用的重載
我相信是有關該錯誤代碼是在下面的goToNextVC FUNC：
func goToNextVC() {
let nextVC = pageViewController(self, viewControllerAfterViewController: viewControllers![0])!
setViewControllers([nextVC], direction: .Forward, animated: true, completion: nil)
}
extension ViewController: UIPageViewControllerDataSource {
func pageViewController(_ pageViewController: UIPageViewController, viewControllerBefore viewController: UIViewController) -> UIViewController? {
// navigate right
switch viewController {
case cardsVC:
return profileVC
case profileVC:
return nil
case matchesVC:
return cardsVC
default:
return nil
}
}
全碼：
// sets up page view controller
let pageController = ViewController(transitionStyle: .scroll, navigationOrientation: .horizontal, options: nil)
class ViewController: UIPageViewController {
// page view controllers here
let cardsVC: UIViewController = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "CardsNavController")
let profileVC: UIViewController = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "ProfileNavController")
let matchesVC: UIViewController! = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "MatchesNavController")
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = UIColor.white
dataSource = self
// loads first view
setViewControllers([cardsVC], direction: .forward, animated: true, completion: nil)
}
// load left view
func goToNextVC() {
let nextVC = pageViewController(self, viewControllerAfterViewController: viewControllers![0])!
setViewControllers([nextVC], direction: .Forward, animated: true, completion: nil)
}
// load right view
func goToPreviousVC() {
let previousVC = pageViewController(self, viewControllerBeforeViewController: viewControllers![0])!
setViewControllers([previousVC], direction: .Reverse, animated: true, completion: nil)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
// MARK - UIPageViewControllerDataSource
extension ViewController: UIPageViewControllerDataSource {
func pageViewController(_ pageViewController: UIPageViewController, viewControllerBefore viewController: UIViewController) -> UIViewController? {
// navigate right
switch viewController {
case cardsVC:
return profileVC
case profileVC:
return nil
case matchesVC:
return cardsVC
default:
return nil
}
}
// navigate left
func pageViewController(_ pageViewController: UIPageViewController, viewControllerAfter viewController: UIViewController) -> UIViewController? {
switch viewController {
case cardsVC:
return matchesVC
case profileVC:
return cardsVC
case matchesVC:
return nil
default:
return nil
}
}
}