Question

I have registered for PDF document type so I can open mail attachments and PDF files viewed in Safari. The problem is that works fine if the application is closed. If the application is in the background. Safari/Mail switches to my App but my App didFinishLaunchingWithOptions function is not called which include the URL to the file. So I cannot access the file in that case.

Do I need to force the user to close the App before opening any document in Safari!

EDIT:
Here is my plist changes

<key>CFBundleDocumentTypes</key>
<array>
    <dict>
        <key>CFBundleTypeName</key>
        <string>PDF Document</string>
        <key>LSHandlerRank</key>
        <string>Alternate</string>
        <key>CFBundleTypeRole</key>
        <string>Viewer</string>
        <key>LSItemContentTypes</key>
        <array>
            <string>public.content</string>
            <string>public.item</string>
            <string>public.data</string>
        </array>
    </dict>
</array>

I was messing with the values but public.content and public.item and public.data just register my App to open any content not just the PDF. still I need to close my App first!

Answer 1

@KDaker has pointed it out in the comments but the bottom line is that you need to implement these two functions in your Application delegate.

- (BOOL) application:(UIApplication *)application handleOpenURL:(NSURL *)url;

- (BOOL) application:(UIApplication *)application openURL:(NSURL *)url sourceApplication:(NSString *)sourceApplication annotation:(id)annotation;