adding color picking on iOS

PanoPainter/GameViewController.m

@@ -157,6 +157,7 @@ int t_count = 0;
 
 - (void)viewDidAppear:(BOOL)animated
 {
+    App::I.redraw = true;
     [self resignFirstResponder];
     [self registerForKeyboardNotifications];
 }
@@ -235,6 +236,8 @@ int t_count = 0;
 
 - (void)glkView:(GLKView *)view drawInRect:(CGRect)rect
 {
+    if (!App::I.redraw)
+        return;
     App::I.clear();
     App::I.update(0);
 }

PanoPainter/Info.plist

@@ -2,6 +2,8 @@
 <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
 <plist version="1.0">
 <dict>
+	<key>NSPhotoLibraryAddUsageDescription</key>
+	<string>Save the pano image in the user gallery</string>
 	<key>CFBundleDevelopmentRegion</key>
 	<string>en</string>
 	<key>CFBundleExecutable</key>