On Jan 8, 2015, at 17:18:21, Kyle Sluder <k...@ksluder.com> wrote:
>
> Make sure you’re not just storing a plain path in NSUserDefaults. To maintain
> access to a resource across app launches, you need to use a security-scoped
> bookmark. This is an NSData that is created from an NSURL via
> -bookmarkDataWithOptions:…
>
> Read the Security Scoped Bookmarks and Persistent Access section of the App
> Sandbox Design Guide for more, including what entitlements you need to enable
> to save the appropriate kind of bookmark (app-scoped):
> <https://developer.apple.com/library/mac/documentation/Security/Conceptual/AppSandboxDesignGuide/AppSandboxInDepth/AppSandboxInDepth.html>
Thanks Graham and Kyle. So since I now need to take control of securing the url
chosen in the path control, I can no longer just bind its value to user
defaults in the xib, right? I've added an action method that gets called when
the path changes, where I create a secure bookmark and store that in user
defaults instead.
Then in awakeFromNib (for when the app launches and the window is created), I
get the bookmark out of user defaults, resolve it securely to the url, and set
the path control's url to that. Sound good so far?
Now I think I'm left with being granted access to that url. It's easy enough to
do that in awakeFromNib right before I use the url to set the path control's
url. But I'll need to keep access to it for the entire run of the app or until
the user chooses a different folder. At what point would you suggest I call
stopAccessingSecurityScopedResource on it? I'd need to do it before the user
chooses a new folder, but before the NSPathControl sets its url, otherwise I'll
lose any references to the url I've been granted access to use.
Actually, the following scheme seems to be working:
-(void) awakeFromNib
{
if(bookmark != nil) {
NSURL* url = [NSURL URLByResolvingBookmarkData:bookmark
options:(NSURLBookmarkResolutionWithoutUI |
NSURLBookmarkResolutionWithSecurityScope) relativeToURL:nil
bookmarkDataIsStale:nil error:nil];
BOOL needToStopAccess = [url
startAccessingSecurityScopedResource];
[self.searchPathView setURL:url];
if(needToStopAccess)
[url stopAccessingSecurityScopedResource];
}
}
Then in my method that actually does the search, do the same start/stop pair.
Is that how start/stop is expected to be used?
--
Steve Mills
Drummer, Mac geek
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