iOS: add a file engine to support loading assets/photos

This patch will add a new file engine that lets the
app load images from the asset library using QFile.
The engine will recognize file names with the scheme
'assets-library', which is the same scheme returned
by UIImagePickerController.

This patch will be the first of a set of patches
that lets the user open a native image picker dialog
by using a QFileDialog with directory set to
QStandardPaths::PictureLocation. This patch will
ensure that the url returned from the dialog can
be loaded using QFile.

AssetsLibrary, which is used in this patch, is actually
deprecated in favor of the new Photos framework. But
since the latter is only supported from iOS8, we
choose to use the former framework for now.

Change-Id: If2a6eb394ae4df55fb4e9e1dc245a1574d38618a
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@theqtcompany.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/src/plugins/platforms/ios/qiosintegration.h b/src/plugins/platforms/ios/qiosintegration.h
index 05d0523dbf..8a27342d2f 100644
--- a/src/plugins/platforms/ios/qiosintegration.h
+++ b/src/plugins/platforms/ios/qiosintegration.h
@@ -39,6 +39,7 @@
 #include <qpa/qwindowsysteminterface.h>
 
 #include "qiosapplicationstate.h"
+#include "qiosfileenginefactory.h"
 
 QT_BEGIN_NAMESPACE
 
@@ -90,6 +91,7 @@ private:
     QIOSApplicationState m_applicationState;
     QIOSServices *m_platformServices;
     mutable QPlatformAccessibility *m_accessibility;
+    QIOSFileEngineFactory m_fileEngineFactory;
 };
 
 QT_END_NAMESPACE