iOS: Ensured that native file choosers also work in iOS apps

modules/juce_audio_plugin_client/AU/juce_AUv3_Wrapper.mm

@@ -1657,6 +1657,17 @@ JuceAudioUnitv3Base* JuceAudioUnitv3Base::create (AUAudioUnit* audioUnit, AudioC
     return new JuceAudioUnitv3 (audioUnit, descr, options, error);
 }
 
+#if JUCE_IOS
+namespace juce
+{
+struct UIViewPeerControllerReceiver
+{
+    virtual ~UIViewPeerControllerReceiver();
+    virtual void setViewController (UIViewController*) = 0;
+};
+}
+#endif
+
 //==============================================================================
 class JuceAUViewController
 {
@@ -1708,6 +1719,9 @@ public:
                    #if JUCE_IOS
                     if (JUCE_IOS_MAC_VIEW* peerView = [[[myself view] subviews] objectAtIndex: 0])
                         [peerView setContentMode: UIViewContentModeTop];
+
+                    if (auto* peer = dynamic_cast<UIViewPeerControllerReceiver*> (editor->getPeer()))
+                        peer->setViewController (myself);
                    #endif
                 }
             }

modules/juce_gui_basics/native/juce_ios_FileChooser.mm

@@ -85,11 +85,27 @@ public:
 
         setOpaque (false);
 
-        auto chooserBounds = Desktop::getInstance().getDisplays().getMainDisplay().userArea;
-        setBounds (chooserBounds);
+        if (SystemStats::isRunningInAppExtensionSandbox())
+        {
+            [controller.get() setModalPresentationStyle:UIModalPresentationFullScreen];
+
+            if (auto* editorPeer = ComponentPeer::getPeer (0))
+            {
+                auto chooserBounds = editorPeer->getComponent().getLocalBounds();
+                setBounds (chooserBounds);
 
-        setAlwaysOnTop (true);
-        addToDesktop (0);
+                setAlwaysOnTop (true);
+                editorPeer->getComponent().addAndMakeVisible (this);
+            }
+        }
+        else
+        {
+            auto chooserBounds = Desktop::getInstance().getDisplays().getMainDisplay().userArea;
+            setBounds (chooserBounds);
+
+            setAlwaysOnTop (true);
+            addToDesktop (0);
+        }
     }
 
     ~Native()
@@ -308,7 +324,7 @@ bool FileChooser::isPlatformDialogAvailable()
    #if JUCE_DISABLE_NATIVE_FILECHOOSERS
     return false;
    #else
-    return [[NSFileManager defaultManager] ubiquityIdentityToken] != nil;
+    return true;
    #endif
 }
 

modules/juce_gui_basics/native/juce_ios_UIViewComponentPeer.mm

@@ -163,8 +163,17 @@ using namespace juce;
 namespace juce
 {
 
+struct UIViewPeerControllerReceiver
+{
+    virtual ~UIViewPeerControllerReceiver();
+    virtual void setViewController (UIViewController*) = 0;
+};
+
+UIViewPeerControllerReceiver::~UIViewPeerControllerReceiver() {}
+
 class UIViewComponentPeer  : public ComponentPeer,
-                             public FocusChangeListener
+                             public FocusChangeListener,
+                             public UIViewPeerControllerReceiver
 {
 public:
     UIViewComponentPeer (Component&, int windowStyleFlags, UIView* viewToAttachTo);
@@ -176,6 +185,12 @@ public:
     void setTitle (const String& title) override;
     void setBounds (const Rectangle<int>&, bool isNowFullScreen) override;
 
+    void setViewController (UIViewController* newController) override
+    {
+        jassert (controller == nullptr);
+        controller = [newController retain];
+    }
+
     Rectangle<int> getBounds() const override               { return getBounds (! isSharedWindow); }
     Rectangle<int> getBounds (bool global) const;
     Point<float> localToGlobal (Point<float> relativePosition) override;
@@ -218,7 +233,7 @@ public:
     //==============================================================================
     UIWindow* window;
     JuceUIView* view;
-    JuceUIViewController* controller;
+    UIViewController* controller;
     bool isSharedWindow, fullScreen, insideDrawRect, isAppex;
 
     static int64 getMouseTime (UIEvent* e) noexcept