我有一個導航選項卡欄,具有不同的幾個選項卡。我想要一個功能,當我按下一個標籤時,無論我在哪裏,它都會使我看到視圖。選項卡導航欄一致性
例如:
「手冊」標籤欄 「打開文檔」另一個標籤欄
當導航到的手冊查看通過敲擊「手冊」,然後打開文件;我希望能看到開放數據模塊的列表,而不是跳到「最後打開的數據模塊」。
我該如何做到這一點?
的「打開文件」的代碼如下:
class DocumentListViewController: BaseViewController {
// MARK: - IB Outlets
@IBOutlet weak var tableView: UITableView!
// MARK: - Properties
var webview:WKWebView!
var documentsToDelete:[Node]?
// MARK: - VC Life Cycle
override func viewDidLoad() {
super.viewDidLoad()
title = NSLocalizedString("Open Documents", comment: "")
tableView.delegate = self
tableView.dataSource = self
tableView.register(UINib(nibName: "TablistHeader", bundle: Bundle.main), forHeaderFooterViewReuseIdentifier: "Header")
webview = WKWebView(frame: .zero, configuration: WKWebViewConfiguration())
webview.navigationDelegate = self
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
tableView.reloadData()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
//MARK: - Business Logic
func remove(documents nodes:[Node]) {
documentsToDelete = nodes
if let section = nodes.first?.sections.first, let urlString = section["url"], let nodePath = nodes.first?.path {
var readAccessFolder:URL?
let pathComponents = URL(fileURLWithPath: nodePath).pathComponents
if pathComponents.count >= 2 {
let rootFolder = "\(pathComponents[1])"
readAccessFolder = URL(fileURLWithPath: "\(PackageManager.shared.packageFolder)\(rootFolder)")
}
let url = URL(fileURLWithPath: urlString)
_ = webview.loadFileURL(url, allowingReadAccessTo: readAccessFolder!)
}
else {
deleteDocumentsFromList()
}
}
fileprivate func deleteDocumentsFromList() {
if let indexes = self.documentsToDelete?.flatMap({ (node) -> Int? in
return PackageManager.shared.openNodes.index(of: node)
})
{
for i in indexes.reversed() {
PackageManager.shared.openNodes.remove(at: i)
}
self.tableView.reloadData()
webview.load(URLRequest(url: URL(string:"about:blank")!))
}
}
func resetProcedureStepCheckboxes() {
if let dmcs = documentsToDelete?.flatMap({ (node) -> String? in
return node.moduleCode
})
{
webview.evaluateJavaScript("resetProcedureStepCheckboxes(\(dmcs))") { (result, error) in
print(error as Any)
self.deleteDocumentsFromList()
}
}
}
override func showDocumentViewController(for node:Node?, openSegment segment:Int = 0) {
let contentView = self.storyboard?.instantiateViewController(withIdentifier: "DocumentViewController") as! DocumentViewController
contentView.currentNode = node
contentView.initalSegment = segment
contentView.navigationItem.titleView = UILabel.forTitleView(withText: node?.title)
navigationController?.pushViewController(contentView, animated: true)
}
}
// MARK: - UITableViewDataSource
extension DocumentListViewController : UITableViewDataSource {
func numberOfSections(in tableView: UITableView) -> Int {
if PackageManager.shared.openNodes.count > 0 {
tableView.removeEmptyMessage()
return 1
} else {
tableView.showEmptyMessage(message: NSLocalizedString("No open documents", comment: ""), viewController: self)
return 0
}
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return PackageManager.shared.openNodes.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let node = PackageManager.shared.openNodes[indexPath.row]
var dText = ""
if let man = node.manual {
dText = "\(man)\n"
}
if let mc = node.moduleCode {
dText = "\(dText)" + "\(mc)"
}
let cell = tableView.dequeueReusableCell(withIdentifier: "OpenDocumentCell", for: indexPath)
cell.imageView?.image = node.image()
cell.imageView?.contentMode = .scaleAspectFill
cell.editingAccessoryType = .none
cell.accessoryType = .disclosureIndicator
cell.textLabel?.text = node.title
cell.detailTextLabel?.numberOfLines = 0
cell.detailTextLabel?.text = dText
return cell
}
}
// MARK: - UITableViewDelegate
extension DocumentListViewController : UITableViewDelegate {
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
return 60
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
tableView.deselectRow(at: indexPath, animated: true)
let node = PackageManager.shared.openNodes[indexPath.row]
showDocumentViewController(for: node)
}
func tableView(_ tableView: UITableView, heightForHeaderInSection section: Int) -> CGFloat {
if PackageManager.shared.openNodes.count == 0 {
return 0
}
return 50
}
func tableView(_ tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
if PackageManager.shared.openNodes.count == 0 {
return nil
}
let header = tableView.dequeueReusableHeaderFooterView(withIdentifier: "Header") as! TablistHeader
header.titleLabel.text = String.localizedStringWithFormat(NSLocalizedString("%i open documents", comment: ""), PackageManager.shared.openNodes.count)
header.onDelete = { [weak self] in
guard let strongSelf = self else { return }
// show action sheet
let title = NSLocalizedString("Clear list", comment: "")
let msg = NSLocalizedString("Do you really want to clear the list of open documents?", comment: "")
let options = UIAlertController(title:title, message: msg, preferredStyle: .alert)
let deleteAll = UIAlertAction(title: NSLocalizedString("Clear list", comment: ""),
style:.destructive,
handler: { (action) -> Void in
strongSelf.remove(documents: PackageManager.shared.openNodes)
})
options.addAction(deleteAll)
let cancel = UIAlertAction(title: NSLocalizedString("Cancel", comment: ""),
style:.cancel,
handler: nil)
options.addAction(cancel)
strongSelf.present(options, animated: true, completion: nil)
}
return header
}
func tableView(_ tableView: UITableView, editActionsForRowAt indexPath: IndexPath) -> [UITableViewRowAction]? {
let del = UITableViewRowAction(style: .destructive, title: NSLocalizedString("Delete", comment: ""), handler: { [weak self] (action, indexPath) -> Void in
guard let strongSelf = self else { return }
let node = PackageManager.shared.openNodes[indexPath.row]
strongSelf.remove(documents: [node])
})
return [del]
}
func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCellEditingStyle, forRowAt indexPath: IndexPath) {
}
}
// MARK: - WKNavigationDelegate
extension DocumentListViewController : WKNavigationDelegate {
func webView(_ webView: WKWebView, didCommit navigation: WKNavigation!) {
}
func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
resetProcedureStepCheckboxes()
}
func webView(_ webView: WKWebView, didFail navigation: WKNavigation!, withError error: Error) {
print(error)
}
func webView(_ webView: WKWebView, decidePolicyFor navigationAction: WKNavigationAction, decisionHandler: @escaping (WKNavigationActionPolicy) -> Void) {
if let abs = navigationAction.request.url?.absoluteString, abs == "about:blank" {
decisionHandler(.cancel)
}
decisionHandler(.allow)
}
}
你能提供屏幕截圖或代碼,表明你想要做什麼?我很難理解你的問題。 – toddg
我用代碼更新了問題。這段代碼基本上顯示了在表格視圖中的手冊,當單擊一個單元格時,它將顯示該特定單元格的詳細頁面。現在,當我切換標籤欄,然後回到此標籤(打開文檔)時,它會顯示詳細的視圖,但我希望讓我看看桌面視圖。希望它現在更有意義,你可以幫助我。如果有的話,問,我會回覆。 – habed