我正在开发一个OS X 10.9的应用程序,使用
swift,沙盒.
该应用程序需要访问sqlite数据库文件.我让用户用NSOpenPanel选择/打开一个文件.然后,我使用NSUserDefaults保存文件路径供以后使用.
我想每次再次启动应用程序时自动打开此文件.我从NSUserDefault获取存储的路径,但是当我用这个路径打开文件时,我收到一个错误,说我没有权限访问该文件.
(它没有沙盒工作)
它看起来像书签是我的问题的解决方案.
是否有一个很好的教程如何使用swift的书签与osx应用程序？
还有其他建议吗？
这是我的回答,我刚刚在
http://swiftrien.blogspot.com/2015/07/persisting-file-access-rights-between.html的一些帮助下在Swift 3中工作
import Foundation
import Cocoa
var bookmarks = [URL: Data]()
func bookmarkPath() -> String
{
var url = app.applicationDocumentsDirectory
url = url.appendingPathComponent("Bookmarks.dict")
return url.path
}
func loadBookmarks()
{
let path = bookmarkPath()
bookmarks = NSKeyedUnarchiver.unarchiveObject(withFile: path) as! [URL: Data]
for bookmark in bookmarks
{
restoreBookmark(bookmark)
}
}
func saveBookmarks()
{
let path = bookmarkPath()
NSKeyedArchiver.archiveRootObject(bookmarks,toFile: path)
}
func storeBookmark(url: URL)
{
do
{
let data = try url.bookmarkData(options: NSURL.BookmarkCreationoptions.withSecurityScope,includingResourceValuesForKeys: nil,relativeto: nil)
bookmarks[url] = data
}
catch
{
Swift.print ("Error storing bookmarks")
}
}
func restoreBookmark(_ bookmark: (key: URL,value: Data))
{
let restoredUrl: URL?
var isstale = false
Swift.print ("Restoring \(bookmark.key)")
do
{
restoredUrl = try URL.init(resolvingBookmarkData: bookmark.value,options: NSURL.BookmarkResolutionoptions.withSecurityScope,relativeto: nil,bookmarkDataIsstale: &isstale)
}
catch
{
Swift.print ("Error restoring bookmarks")
restoredUrl = nil
}
if let url = restoredUrl
{
if isstale
{
Swift.print ("URL is stale")
}
else
{
if !url.startAccessingSecurityScopedResource()
{
Swift.print ("Couldn't access: \(url.path)")
}
}
}
}
func allowFolder() -> URL?
{
let openPanel = NSOpenPanel()
openPanel.allowsMultipleSelection = false
openPanel.canChooseDirectories = true
openPanel.canCreateDirectories = true
openPanel.canChooseFiles = false
openPanel.begin
{ (result) -> Void in
if result == NSFileHandlingPanelOKButton
{
let url = openPanel.url
storeBookmark(url: url!)
}
}
return openPanel.url
}
要使用此代码,您必须先调用NSOpenPanel,以便用户可以选择允许您访问的文件夹. NSOpenPanel必须存储为书签并保存到磁盘.
let url = allowFolder() saveBookmarks()
重新启动应用程序时,您必须调用
loadBookmarks()
那么您的应用程序将具有与用户选择文件夹时相同的访问级别.希望这有助于某人.