我有CellViewConnection的问题。我有两个故事板：
CellViewConnection带按钮和PDF文件列表项，但我有一个问题。当我按下第一个按钮向我显示第一个带有sender.tag的PDF文件时，我制作了代码。但是我没有得到第一个按钮的结果，第二个按钮我得到的结果与第一个PDF相同。
如何使第一个按钮获得第一个，第二个按钮获取第二个PDF文件？ 这是我的代码：
import UIKit
import PDFKit
@available(iOS 11.0, *)
@available(iOS 11.0, *)
@available(iOS 11.0, *)
@available(iOS 11.0, *)
@available(iOS 11.0, *)
@available(iOS 11.0, *)
@available(iOS 11.0, *)
@available(iOS 11.0, *)
@available(iOS 11.0, *)
@available(iOS 11.0, *)
@available(iOS 11.0, *)
class FirstARViewController: UIViewController , UICollectionViewDelegate , UICollectionViewDataSource, UICollectionViewDelegateFlowLayout {
@IBOutlet weak var collectionView: UICollectionView!
var imagescv = ["ar1","ar2" ]
override func viewDidLoad() {
super.viewDidLoad()
collectionView.delegate = self
collectionView.dataSource = self
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return imagescv.count
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath) as! cellimagesar
cell.layer.cornerRadius = 5
cell.layer.borderWidth = 1
cell.myImages.image = UIImage(named: imagescv [indexPath.row])
cell.myImages.contentMode = .scaleToFill
cell.buttonMove.tag = indexPath.item
cell.buttonMove.addTarget(self, action: #selector(self.buttonClicked), for: .touchUpInside)
return cell
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
return CGSize(width: 171, height: 250)
}
let me = PDFViewController()
@objc func buttonClicked(_ sender: UIButton) {
if (sender.tag == 0) {
PDFimport()
let pdfView = PDFView(frame: UIScreen.main.bounds)
let url = Bundle.main.url(forResource: "AR1", withExtension: "pdf")
let vc = UIDocumentInteractionController(url: url!)
pdfView.document = PDFDocument(url: url!)
view.addSubview(pdfView)
vc.delegate = (PDFViewController() as UIDocumentInteractionControllerDelegate)
}
else if (sender.tag == 1) {
PDFimport()
let pdfView = PDFView(frame: UIScreen.main.bounds)
let url = Bundle.main.url(forResource: "AR2", withExtension: "pdf")
let vc = UIDocumentInteractionController(url: url!)
pdfView.document = PDFDocument(url: url!)
view.addSubview(pdfView)
vc.delegate = (PDFViewController() as UIDocumentInteractionControllerDelegate)
}
}
func PDFimport()
{
let storyBoard : UIStoryboard = UIStoryboard(name: "Main", bundle:nil)
let nextViewController = storyBoard.instantiateViewController(withIdentifier: "PDF")
self.present(nextViewController, animated:true, completion:nil)
}
func documentInteractionControllerViewControllerForPreview(_ controller: UIDocumentInteractionController) -> UIViewController {
return self
}
}
第二观点：
import UIKit
import PDFKit
import QuickLook
@available(iOS 11.0, *)
@available(iOS 11.0, *)
class PDFViewController: UIViewController {
lazy var document: UIDocumentInteractionController = {
let pdfView = PDFView(frame: UIScreen.main.bounds)
let url = Bundle.main.url(forResource: "", withExtension: "pdf")
let vc = UIDocumentInteractionController(url: url!)
pdfView.document = PDFDocument(url: url!)
view.addSubview(pdfView)
vc.delegate = (PDFViewController() as UIDocumentInteractionControllerDelegate)
return vc
}()
override func viewDidLoad() {
super.viewDidLoad()
document.presentPreview(animated: true)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
@IBOutlet weak var pdfView: PDFView!
@IBAction func doAction1(_ sender: AnyObject) {
document.presentOpenInMenu(from: view.bounds, in: view, animated: true)
}
@IBAction func save(_ sender: Any)
{
document.presentOptionsMenu(from: view.bounds, in: view, animated: true)
}
@IBAction func backbutton(_ sender: Any)
{
let storyBoard : UIStoryboard = UIStoryboard(name: "Main", bundle:nil)
let nextViewController = storyBoard.instantiateViewController(withIdentifier: "back")
self.present(nextViewController, animated:true, completion:nil)
}
}
@available(iOS 11.0, *)
extension PDFViewController: UIDocumentInteractionControllerDelegate {
func documentInteractionControllerViewControllerForPreview(_ controller: UIDocumentInteractionController) -> UIViewController {
return self
}
}
在这里，我使用了相同的代码
我的CollectionView cellForItemAt
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell
{
//Declaring cell
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: cellReuseIdentifier,for: indexPath) as! CustomCollectionViewCell
//Adding Button reference No need to give Tags Differently
cell.StarImageButton.addTarget(self, action: #selector(HomeVC.FavouriteButtonHandler(sender:)), for: .touchUpInside)
//Return cell
return cell
}
我的按钮处理程序必需
@objc func FavouriteButtonHandler (sender: UIButton)
{
//Lets get the button position as CGPoint
let buttonPosition : CGPoint = sender.convert(CGPoint.zero, to: self.HotDealsCollectionView)
//using CGPoint we can get index Path of cell in which button was clicked
let indexPath : IndexPath = self.HotDealsCollectionView.indexPathForItem(at: buttonPosition)!
//Now, Do any required operation as here I need to reload my collectionView cell
self.HotDealsCollectionView.reloadItems(at: [indexPath])
//You can use the index path to iterate in array of pdf files like
**pdfArray[indexPath.row]** //And open it
//as per in your case
switch indexPath.row {
case 0:
//Required Code for opening Pdf at index 0
break
case 1:
//Required Code for opening Pdf at index 1
break
default:
print("No index FOund")
}
}
在这里，我实际上是指而不是使用按钮标签为什么不直接使用所选索引，就像我们通常在cellForItemAt中所做的那样
我遇到了你的问题......
cell.buttonMove.tag = indexPath.item
cell.buttonMove.addTarget(self, action: #selector(self.buttonClicked), for: .touchUpInside)
现在，如果您分析代码，您可以看到您正在调用没有参数的函数，这意味着UIButton永远不会分配给您的函数参数，这最终会导致问题，默认情况下您的标记始终为零，这就是为什么它始终打开您的第一个pdf文件。
请更改您的代码
cell.buttonMove.tag = indexPath.item
cell.buttonMove.addTarget(self, action: #selector(self.buttonClicked(_:)), for: .touchUpInside)
有关更多详细信息，请查看此answer