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ios - 关闭pdf文件后 Storyboardsegue错误

转载 作者:行者123 更新时间:2023-11-30 12:46:17 25 4
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当我加载完pdf文件后,当我按下“完成”按钮时,它应该返回到以前的 View Controller ,如果我愿意,我应该能够再次打开相同的pdf文件。但这里的情况并非如此,当我尝试打开同一个 pdf 时,我收到此错误

fileSystemRepresentationWithPath:]: nil 或空路径参数'

如果我将解雇功能更改为此_ = self.navigationController?.popToRootViewController(动画: true)

它仍然有效。谁能帮我解决这个问题。这是我的代码。

类 showA3lamDa3waVC:UIViewController、UIWebViewDelegate、ReaderViewControllerDelegate{

var pdfbooks = UIWebView()
var nIndex:NSInteger!
var post: Post!
var db : DBHelperA3lam = DBHelperA3lam()
var book : a3lamDa3waModel?


@IBAction func backbtn(_ sender: Any) {

if let navController = self.navigationController {
navController.popViewController(animated: true)
}
}


override func viewDidLoad() {
super.viewDidLoad()

var config : SwiftLoader.Config = SwiftLoader.Config()
config.size = 150
config.spinnerColor = .brown
config.foregroundColor = .black
config.foregroundAlpha = 0.5
config.titleTextColor = .brown


SwiftLoader.setConfig(config)


if "" != book?.bookPath {
// self.activityIND.isHidden = true
// self.activityIND.stopAnimating()

SwiftLoader.hide()
UIApplication.shared.isNetworkActivityIndicatorVisible = false

loadReader(filePaht: (book?.bookPath)!)
} else {

let documentsPath = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0]
let strName = book?.id
let filePath = "\(documentsPath)/"+strName!+".pdf"
let fileManager = FileManager.default
// self.activityIND.startAnimating()

SwiftLoader.show(title: "Loading...", animated: true)
UIApplication.shared.isNetworkActivityIndicatorVisible = true


if fileManager.fileExists(atPath: filePath) {
// self.loadFromUrl(path: filePath)
loadReader(filePaht: (book?.bookPath)!)
return;
}


let reference = FIRStorage.storage().reference(forURL: (self.book?.bookURL)!)
reference.data(withMaxSize: 50 * 1024 * 1024) { (data, error) -> Void in
if (error != nil) {

print ("unable to download pdf file from Firebase Storage")

// self.activityIND.isHidden = false
// self.activityIND.startAnimating()
SwiftLoader.show(title: "Loading...", animated: true)
UIApplication.shared.isNetworkActivityIndicatorVisible = true


} else {

if ((try! data?.write(to: URL.init(fileURLWithPath: filePath, isDirectory: false))) != nil) {
// self.loadFromUrl(path: filePath)
print ("pdf file is downloaded from Firebase Storage")
self.db.upDate(id: (self.book?.id)!, bookPath: filePath)
// self.activityIND.isHidden = true
SwiftLoader.hide()
self.loadReader(filePaht: filePath)
UIApplication.shared.isNetworkActivityIndicatorVisible = false




}
}
}

}
}


func loadReader(filePaht : String) {

let document = ReaderDocument(filePath: filePaht, password: nil)
if document != nil {
let readerVC = ReaderViewController(readerDocument: document)
readerVC?.delegate = self
readerVC?.modalTransitionStyle = UIModalTransitionStyle.crossDissolve
readerVC?.modalPresentationStyle = UIModalPresentationStyle.fullScreen
self.navigationController?.pushViewController(readerVC!, animated: true)
}

}

func dismiss(_ viewController: ReaderViewController!) {

// _ = self.navigationController?.popToRootViewController(animated: true)

if let a3lamDa3waVC = self.navigationController?.viewControllers[1] {

_ = navigationController?.popToViewController(a3lamDa3waVC, animated: true)
}
}


override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}

}

这是 Collection View 的代码

a3lamDa3waVC 类:UIViewController、UICollectionViewDelegate、UICollectionViewDataSource{

@IBOutlet weak var collectionView: UICollectionView!


var posts = [Post]()
let db : DBHelperA3lam = DBHelperA3lam()
var arrayBooks = [a3lamDa3waModel]()
var selectedIndexPath : IndexPath = IndexPath()
var post: Post!

override func viewDidLoad() {

var config : SwiftLoader.Config = SwiftLoader.Config()
config.size = 150
config.spinnerColor = .brown
config.foregroundColor = .black
config.foregroundAlpha = 0.5
config.titleTextColor = .brown


SwiftLoader.setConfig(config)


super.viewDidLoad()
// activityIndicator.isHidden = false

SwiftLoader.show(title: "Loading...", animated: true)


self.arrayBooks.removeAll()
self.arrayBooks.append(contentsOf: self.db.fetchAll())
self.collectionView.reloadData()
DataService.ds.REF_POSTS.observe(.value, with: { (snapshot) in


if let snapshot = snapshot.children.allObjects as? [FIRDataSnapshot] {

for snap in snapshot {
print ("SNAP: \(snap)")

if let postDict = snap.value as? Dictionary<String, AnyObject>{
let key = snap.key
let post = Post(postKey: key , postData: postDict)
self.posts.append(post)
self.db.insertBook(id: postDict["id"] as! String, imgName: postDict["id"] as! String, imgPath: "", bookName: postDict["book_name"] as! String, bookPath: "", imageURL: postDict["image_path"] as! String, bookURL: postDict["book_path"] as! String, caption: "")




}
}
} else {

}
self.arrayBooks.removeAll()
self.arrayBooks.append(contentsOf: self.db.fetchAll())
self.collectionView.reloadData()

})


collectionView.delegate = self
collectionView.dataSource = self

}
func getFilePath(name : String) -> String {

let documentsPath = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0]
let filePath = documentsPath+"/"+name
return filePath
}


@IBAction func backbtn(_ sender: Any) {
if let navController = self.navigationController {
navController.popViewController(animated: true)
}
}



func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {


return arrayBooks.count
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {

let book = arrayBooks[indexPath.item]
SwiftLoader.hide()

if let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath)as? CollectionViewCellA3lamDa3wa {

cell.initWithBook(book: book)

return cell

}else {
return CollectionViewCellA3lamDa3wa()
}


}

func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
self.selectedIndexPath = indexPath
self.performSegue(withIdentifier: "showImage", sender: self)
}

override func prepare(for segue: UIStoryboardSegue, sender: Any?)
{

if segue.identifier == "showImage"
{
let vc = segue.destination as! showA3lamDa3waVC
vc.book = self.arrayBooks[self.selectedIndexPath.row]

}
}

}

最佳答案

为什么不使用 popViewController(animated:) 方法?它必须返回到上一个 View Controller ( Apple doc. )。

关于ios - 关闭pdf文件后 Storyboardsegue错误,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/41599624/

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