Question

我有一个包含三个ViewControllers的UIPageViewcontroller。一个Viewcontroller是我的ProfileViewcontroller。我的ProfileViewController中有一个按钮，按下时应告诉UIPageViewCongtroller，切换到下一个Viewcontroller。这是我第一次实施代表，但我无法弄清楚为什么它不起作用。

UIPageViewController类：

class PageViewController: UIPageViewController, ProfileViewControllerDelegate {

private(set) lazy var orderedViewControllers: [UIViewController] = {


// The view controllers will be shown in this order
return [self.newColoredViewController("Search"),
      self.newColoredViewController("Menu"),
      self.newColoredViewController("Profile"),
      self.newColoredViewController("Offer")]
}()

override func viewDidLoad() {
super.viewDidLoad()

dataSource = self



if orderedViewControllers.count >= 2 {
scrollToViewController(orderedViewControllers[1])
}

}

// MARK: ProfileViewControllerDelegate
func profileViewControllerDidTouchOffer(viewController:ProfileViewController, sender: AnyObject) {
scrollToNextViewController()
print("I'm pressing the offer Button")
}

ProfileViewController类：

protocol ProfileViewControllerDelegate : class {
func profileViewControllerDidTouchOffer(controller:   ProfileViewController, sender: AnyObject)
}

class ProfileViewController: UIViewController {

weak var delegate: ProfileViewControllerDelegate?

@IBOutlet var profileImageView: SpringImageView!
@IBOutlet var offerButton: UIButton!

override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
@IBAction func offerButtonTouchUpInside(sender: AnyObject) {

delegate?.profileViewControllerDidTouchOffer(self, sender: sender)

}

答案

我通过改变在orderderedViewControllers中添加ViewControllers的方式更新了PageViewController类：

private(set) lazy var orderedViewControllers: [UIViewController] = {
// The view controllers will be shown in this order

let profileVC = UIStoryboard(name: "Main", bundle: nil)   .instantiateViewControllerWithIdentifier("ProfileViewController") as!   ProfileViewController
profileVC.delegate = self

return [self.newColoredViewController("Search"),
      self.newColoredViewController("Menu"),
      profileVC,
      self.newColoredViewController("Offer")]
}()

Answer 1

看起来您正在使用InterfaceBuilder，因此我不确定它是如何在那里完成的（可能在prepareForSegue中），但典型的模式是这样的：

let vc = ProfileViewController() 
vc.delegate = self // Or whatever you want to act as the delegate 
// Now show the view controller.

关键是在使用视图控制器之前，确保它的委托属性设置为委托的东西并符合协议。通常，呼叫控制器将是代表。

编辑：如果您正在使用UIPageViewController，那么您应该将该委托添加到viewController，然后再将其传递给setViewControllers https://developer.apple.com/library/ios/documentation/UIKit/Reference/UIPageViewControllerClassReferenceClassRef/#//apple_ref/occ/instm/UIPageViewController/setViewControllers:direction:animated:completion：

Swift Delegate函数未被执行

1 个答案: