当我将数据从TableView传递给子页面控制器时，它可以转到下一个子页面

Question

我有一个UIViewControllerUITableView。然后我用两个viewcontroller创建一个PageViewController。如果我将数据传递给孩子，Pageview不起作用。如果我改变

setViewControllers([subjective], direction: .Forward, animated: true, completion: nil) 

到

setViewControllers([firstVC], direction: .Forward, animated: true, completion: nil) 

综合浏览量的工作，但数据不通过。我对此毫不知情。请帮帮我。由于

代码工作：

浏览量控制器类：

import UIKit 

class PageVC : UIPageViewController, UIPageViewControllerDelegate, UIPageViewControllerDataSource { 

var lblhoten = String() 
var lblngaysinh = String() 
var lblsodt = String() 

lazy var VCArr: [UIViewController] = { 
    return [self.VCInstance("ThongTinBNPage2"), 
      self.VCInstance("ThongTinBNPage3")] 
}() 

private func VCInstance(name: String) -> UIViewController { 
    return UIStoryboard(name: "Main", bundle: nil).instantiateViewControllerWithIdentifier(name) 
} 

override func viewDidLoad() { 
    super.viewDidLoad() 
    self.dataSource = self 
    self.delegate = self 
    if let firstVC = VCArr.first { 
     let subjective = self.storyboard?.instantiateViewControllerWithIdentifier("ThongTinBNPage2") as! VCSubjective 
     subjective.lblhoten = lblhoten 
     subjective.lblngaysinh = lblngaysinh 
     subjective.lblsodt = lblsodt 
     setViewControllers([subjective], direction: .Forward, animated: true, completion: nil) 
    } 
} 

public func pageViewController(pageViewController: UIPageViewController, viewControllerBeforeViewController viewController: UIViewController) -> UIViewController? { 
    guard let viewcontrollerindex = VCArr.indexOf(viewController) else { 
     return nil 
    } 

    let previousindex = viewcontrollerindex - 1 


    guard previousindex >= 0 else { 
     return VCArr.last 
    } 

    guard VCArr.count > previousindex else { 
     return nil 
    } 

    return VCArr[previousindex] 
} 

public func pageViewController(pageViewController: UIPageViewController, viewControllerAfterViewController viewController: UIViewController) -> UIViewController? { 
    guard let viewcontrollerindex = VCArr.indexOf(viewController) else { 
     return nil 
    } 

    let nextindex = viewcontrollerindex + 1 


    guard nextindex < VCArr.count else { 
     return VCArr.first 
    } 

    guard VCArr.count > nextindex else { 
     return nil 
    } 

    return VCArr[nextindex] 
} 

public func presentationCountForPageViewController(pageViewController: UIPageViewController) -> Int { 
    return VCArr.count 
} 

// The selected item reflected in the page indicator. 
public func presentationIndexForPageViewController(pageViewController: UIPageViewController) -> Int { 
    guard let firstviewcontroller = viewControllers?.first, 
     let firstviewcontrollerindex = VCArr.indexOf(firstviewcontroller) else { 
      return 0 
    } 

    return firstviewcontrollerindex 
} 

}

VCSubjective：

import UIKit 

class VCSubjective: UIViewController { 

@IBOutlet var hoten: UILabel! 
@IBOutlet var ngaysinh: UILabel! 
@IBOutlet var sodt: UILabel! 

var lblhoten = String() 
var lblngaysinh = String() 
var lblsodt = String() 

override func viewDidLoad() { 
    super.viewDidLoad() 
    // Do any additional setup after loading the view.   
    hoten.text = lblhoten 
    ngaysinh.text = lblngaysinh 
    sodt.text = lblsodt 
} 

override func didReceiveMemoryWarning() { 
    super.didReceiveMemoryWarning() 
    // Dispose of any resources that can be recreated. 
} 


} 

Answer 1

这里的问题是你引用了两个完全不同的对象。

在viewDidLoad中，您创建了ThongTinBNPage2 viewController，然后将其添加到pageViewController的viewControllers属性中。但是，存储在VCArr中的对象是两个完全不同的viewController。

让我们来想想这样说：

1. 当viewDidLoad是叫你创建的viewController object #1
2. 然后你指定的viewController object #1到pageViewController的viewControllers对象制作的viewControllers = [object #1]
3. 值在pageViewController(pageViewController: UIPageViewController, viewControllerAfterViewController viewController: UIViewController) -> UIViewController?和pageViewController(pageViewController: UIPageViewController, viewControllerBeforeViewController viewController: UIViewController) -> UIViewController?您引用VCArr对象。在第一次调用VCArr，它懒洋洋地创建了两个完全不同的视图控制器对象[object #2, object #3]

为了解决这个问题，你需要做到以下几点：

if let firstVC = VCArr.first { 
    let subjective = firstVC // DO NOT create different VC here 
    subjective.lblhoten = lblhoten 
    subjective.lblngaysinh = lblngaysinh 
    subjective.lblsodt = lblsodt 
    setViewControllers([subjective], direction: .Forward, animated: true, completion: nil) 
}