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当用户在小区中它会去详细视图控制器点击选择方法这里我张贴与所选择的索引（一个类的对象）的通知。详细视图控制器我使用了一个容器视图。在这个容器视图中，我使用了具有两个视图控制器的页面视图控制器，让我们对应地说A和B.我创建的这两个视图控制器都添加了观察者方法。但只有'A'视图控制器正在注册通知。如何获得B视图控制器中选定的索引（类的对象）..？
详细视图控制器的代码
override func viewDidLoad() {
super.viewDidLoad()
NotificationCenter.default.post(name: Notification.Name(rawValue: mynotificationkey), object: nil, userInfo: ["object": self.treatobj])
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "pageView2" {
if let destination = segue.destination as? PageViewController {
destination.treatmentObject = treatobj
}
}
}
，其执行第二视图控制器的细
override func viewDidLoad() {
super.viewDidLoad()
NotificationCenter.default.addObserver(self, selector: #selector(display(notification:)), name: Notification.Name(rawValue: mynotificationkey), object: nil)
}
override func viewWillDisappear(_ animated: Bool) {
NotificationCenter.default.removeObserver(self)
}
func display(notification: Notification){
if let object = notification.userInfo {
if let obj = object["object"] {
treatObject = obj as! TreatMents
print(treatObject)
self.detailTitleLabel.text = treatObject.trtName
self.DesctextView.text = treatObject.desc1
}
}
}
代码不执行添加观察者
override func viewDidLoad() {
super.viewDidLoad()
about.text = treatObj.aboutkerala
//benifits = treatObj.benifits!
NotificationCenter.default.addObserver(self, selector: #selector(notfrecieved(notification:)), name: NSNotification.Name(rawValue: mynotificationkey), object: nil)
// Do any additional setup after loading the view.
}
func notfrecieved(notification: Notification) {
if let object = notification.userInfo {
if let obj = object["object"] {
print(obj)
treatObj = obj as! TreatMents
about.text = treatObj.aboutkerala
benifits = treatObj.benifits!
DispatchQueue.main.async {
self.tableView.reloadData()
}
}
}
}
首先视图控制器的代码页面视图控制器代码
class PageViewController: UIPageViewController, UIPageViewControllerDelegate, UIPageViewControllerDataSource {
var treatmentObject = TreatMents()
lazy var VCArray : [UIViewController] = {
return [self.VCInstance(name: "DescFisrtVC"),
self.VCInstance(name: "DescSecondVC"),
]
}()
private func VCInstance(name: String) -> UIViewController {
return UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: name)
}
public func pageViewController(_ pageViewController: UIPageViewController, viewControllerBefore viewController: UIViewController) -> UIViewController? {
guard let viewControllerIndex = VCArray.index(of: viewController) else {
return nil
}
let previousIndex = viewControllerIndex - 1
guard previousIndex >= 0 else {
return VCArray.last
}
guard VCArray.count > previousIndex else {
return nil
}
return VCArray[previousIndex]
}
public func pageViewController(_ pageViewController: UIPageViewController, viewControllerAfter viewController: UIViewController) -> UIViewController? {
guard let viewControllerIndex = VCArray.index(of: viewController) else {
return nil
}
let nextIndex = viewControllerIndex + 1
guard nextIndex < VCArray.count else {
return VCArray.first
}
guard VCArray.count > nextIndex else {
return nil
}
return VCArray[nextIndex]
}
// A page indicator will be visible if both methods are implemented, transition style is 'UIPageViewControllerTransitionStyleScroll', and navigation orientation is 'UIPageViewControllerNavigationOrientationHorizontal'.
// Both methods are called in response to a 'setViewControllers:...' call, but the presentation index is updated automatically in the case of gesture-driven navigation.
public func presentationCount(for pageViewController: UIPageViewController) -> Int {
return VCArray.count
}
public func presentationIndex(for pageViewController: UIPageViewController) -> Int {
guard let firstViewController = viewControllers?.first, let firstViewcontrollerIndex = VCArray.index(of: firstViewController) else {
return 0
}
return firstViewcontrollerIndex
}
override func viewDidLoad() {
super.viewDidLoad()
self.dataSource = self
self.delegate = self
if let firstVc = VCArray.first {
setViewControllers([firstVc], direction: .forward, animated: true, completion: nil)
}
// Do any additional setup after loading the view.
}
您在哪里发布此通知NSNotification.Name（rawValue：mynotificationkey）。 ？ – KKRocks
您需要使用不同的密钥进行通知。 – KKRocks
我将全局变量声明为mynotificationkey并将值存储到该变量 –