我有一个rootViewController,它基本上是我的pageViewController,它实现了所有的页面控制器协议功能。我已经使用pageControl成功实现了整个pageViewController,它正确显示了当前的页码。
在rootViewController中包含的第一页上,我有一个viewController,其中有多个textFields必须用pickerView填充。我还创建了一个随选择器一起使用的inputAccessory工具栏。一旦所有字段都填充了文本,toolBar上的barButton就会切换为Done。点击这个'完成'按钮,在这个viewController中,我希望rootViewController转到下一页。
我首先尝试直接呈现我想转向的viewController,但注意到该页面并未作为pageViewController的一部分呈现(看起来很明显为什么它现在不起作用!)。所以我接着试图实现一个协议,它会触发rootViewController转到下一页。我已经完美地实现了所有功能,但代表没有被设置。我似乎无法理解为什么它没有被设定。这可能是因为我在UIPageViewController框架流程中可能遗漏了一些东西吗?我很难过。
最终在协议中我试图在包含的ViewController和rootViewController之间进行通信。
这是我的源代码:
在rootController中:
import UIKit
class rootPageViewController: UIViewController, UIPageViewControllerDataSource,
UIPageViewControllerDelegate, tutorialPageTurnerDelegate {
var tutorialOne = userInputViewController()
@IBOutlet var pageLight: UIPageControl!
var turn: UIPageViewController!
let pages = ["userInput","tutorialOne","tutorialTwo","connectScreen"]
var i: Int!
override func viewDidLoad() {
super.viewDidLoad()
if let take = storyboard?.instantiateViewControllerWithIdentifier("pageView") {
self.addChildViewController(take)
self.view.addSubview(take.view)
take.view.addSubview(pageLight)
take.view.bringSubviewToFront(pageLight)
turn = take as! UIPageViewController
turn.dataSource = self
turn.delegate = self
// the delegate for the protocol I've implemented
tutorialOne.delegate = self
turn.setViewControllers([viewControllerAtIndex(0)!], direction: UIPageViewControllerNavigationDirection.Forward, animated: true, completion: nil)
turn.didMoveToParentViewController(self)
}
}
.
.
... pageviewcontroller protocol functions and misc code ...
.
.
// Helper Function to return Index
func viewControllerAtIndex(index: Int) -> UIViewController? {
let vc = storyboard?.instantiateViewControllerWithIdentifier(pages[index])
// _________EDIT_________
if index == 0 {
var tutorialOne: userInputViewController = userInputViewController()
tutorialOne.delegate = self
}
return vc
}
// function required by the protocol
func saveActionCompleted() {
print("Yes it does come here")
turn.setViewControllers([viewControllerAtIndex(1)!], direction: UIPageViewControllerNavigationDirection.Forward, animated: true, completion: nil)
turn.didMoveToParentViewController(self)
}
...
现在这里是我创建协议的viewcontroller:
import UIKit
import CoreData
protocol tutorialPageTurnerDelegate {
func saveActionCompleted()
}
class userInputViewController: UIViewController, UIPickerViewDataSource, UIPickerViewDelegate,
UITextFieldDelegate, UIImagePickerControllerDelegate, UINavigationControllerDelegate {
var delegate: tutorialPageTurnerDelegate?
override func viewDidLoad() {
super.viewDidLoad()
//Create toolbar
let toolBar = UIToolbar()
toolBar.barStyle = UIBarStyle.Default
toolBar.translucent = true
toolBar.tintColor = UIColor(red: 81/255, green: 45/255, blue: 168/255, alpha: 1)
toolBar.sizeToFit()
let doneButton = UIBarButtonItem(title: "Done", style: UIBarButtonItemStyle.Plain, target: self, action: "donePicker")
let spaceButton = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.FlexibleSpace, target: nil, action: nil)
toolBar.setItems([spaceButton, nextButton], animated: false)
toolBar.userInteractionEnabled = true
....... more misc code ...
}
// The selector function for the toolbar from where I want to notify the root controller
func donePicker(){
self.view.endEditing(true)
saveDataAction(self)
if delegate != nil {
delegate!.saveActionCompleted()
} else {
print("PageTurnerDelegate is nil")
}
}
...
} //End
我得到PageTurnerDelegate为零。我尝试了一些解决方法,但都是徒劳的。我确实感觉可能有更好的方法来做到这一点。欢迎任何建议或见解!
答案 0 :(得分:2)
您需要设置将显示的视图控制器实例的delegate
属性:
func viewControllerAtIndex(index: Int) -> UIViewController? {
let vc = storyboard?.instantiateViewControllerWithIdentifier(pages[index])
if index == 0 {
let userInputViewController =vc as! userInputViewController
userInputViewController.delegate = self
}
return vc
}
此外,按照惯例,类以大写字母开头,因此应为UserInputViewController