我有一个 Split View Controller，当用户单击 Table View 中的一个单元格时，该应用会显示一个 View Controller，其中包含一个 Container View 和一个 Segment Control，用于在两个 subview Controller 之间切换。
第一个 subview Controller 是一个 Collection View Controller 。在 Collection View 的每个单元格中都有一个词。
View 看起来像这样:
我使用此代码(从详细 View Controller ， subview 的容器)以编程方式添加 subview Controller :
override func viewDidLoad() {
self.currentViewController = self.storyboard?.instantiateViewController(withIdentifier: "WordCollectionViewControllerID")
(self.currentViewController as! WordCollectionViewController).text = self.text
self.currentViewController?.view.translatesAutoresizingMaskIntoConstraints = false
self.addChildViewController(self.currentViewController!)
self.addSubview(subView: self.currentViewController!.view, toView: self.textContainerView)
self.currentViewController?.view.layoutIfNeeded()
self.currentViewController?.didMove(toParentViewController: self)
super.viewDidLoad()
}
func addSubview(subView: UIView, toView parentView: UIView) {
parentView.addSubview(subView)
var viewBindingsDict = [String: AnyObject]()
viewBindingsDict["subView"] = subView
parentView.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "H:|[subView]|", options: [], metrics: nil, views: viewBindingsDict))
parentView.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "V:|[subView]|", options: [], metrics: nil, views: viewBindingsDict))
}
下面是使用分段控件在两个 subview 之间切换的代码:
@IBAction func changeChildViewController(_ sender: UISegmentedControl) {
if sender.selectedSegmentIndex == 0 {
let newViewController = self.storyboard?.instantiateViewController(withIdentifier: "WordCollectionViewControllerID")
(newViewController as! WordCollectionViewController).text = self.text
newViewController!.view.translatesAutoresizingMaskIntoConstraints = false
cycle(from: self.currentViewController!, to: newViewController!)
self.currentViewController = newViewController
print("Reorder")
} else {
let newViewController = self.storyboard?.instantiateViewController(withIdentifier: "NavigationControllerEditTextViewControllerID")
(newViewController?.childViewControllers[0] as! EditTextViewController).text = self.text
newViewController!.view.translatesAutoresizingMaskIntoConstraints = false
cycle(from: self.currentViewController!, to: newViewController!)
self.currentViewController = newViewController
print("Edit")
}
}
func cycle(from: UIViewController, to: UIViewController) {
from.willMove(toParentViewController: nil)
self.addChildViewController(to)
self.addSubview(subView: to.view, toView: self.textContainerView)
to.view.layoutIfNeeded()
from.view.removeFromSuperview()
from.removeFromParentViewController()
to.didMove(toParentViewController: self)
}
为了能够重新排序单元格，我已经为我的自定义 CollectionViewController 类实现了这个方法:
override func collectionView(_ collectionView: UICollectionView, moveItemAt sourceIndexPath: IndexPath, to destinationIndexPath: IndexPath) {
// Swap values if sorce and destination
let change = textArray[sourceIndexPath.row]
textArray.remove(at: sourceIndexPath.row)
textArray.insert(change, at: destinationIndexPath.row)
// Save changes in Core Data
text?.reordered_text = textArray.joined(separator: " ")
(UIApplication.shared.delegate as! AppDelegate).saveContext()
collectionView.reloadData()
}
问题是，当我单击表格 View 单元格并且应用程序显示嵌入了 Collection View Controller 的容器 View 时，我无法对单元格重新排序，为了能够做到这一点，我必须更改子项 (使用分段控件)，然后返回到 Collection View 。
我该如何解决这个问题？
最佳答案
尝试实现这些方法:
func beginInteractiveMovementForItem(at: IndexPath) -> Bool
func updateInteractiveMovementTargetPosition(targetPosition: CGPoint)
func endInteractiveMovement()
func cancelInteractiveMovement()
您可以按照本教程进行操作:http://nshint.io/blog/2015/07/16/uicollectionviews-now-have-easy-reordering/
关于ios - 无法重新排序 Collection View 单元格，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/39472133/