iOS: Update diagnostic screen on state update

Summary: Update the diagnostic screen whenever the sonar state changes.

Reviewed By: priteshrnandgaonkar

Differential Revision: D9218765

fbshipit-source-id: 654a35e309cb43df18bc8c8a645d469eddc1031d

iOS/SonarKit/SKStateUpdateCPPWrapper.h

@@ -0,0 +1,19 @@
+#ifdef FB_SONARKIT_ENABLED
+
+#include <Sonar/SonarStateUpdateListener.h>
+#import "FlipperStateUpdateListener.h"
+
+/*
+ * This class exists to bridge the gap between Objective C and C++.
+ * A SKStateUpdateCPPWrapper instance allows for wrapping an Objective-C object
+ * and passing it to the pure C++ SonarClient, so it can be triggered when updates occur.
+ */
+class SKStateUpdateCPPWrapper : public SonarStateUpdateListener {
+public:
+  SKStateUpdateCPPWrapper(id<FlipperStateUpdateListener> delegate_);
+  void onUpdate();
+private:
+  __weak id<FlipperStateUpdateListener> delegate_;
+};
+
+#endif