Added CocoaUtils class with convenient dispatch_sync() and dispatch_async() methods for running code on the main thread.

Author: shannah

java/src/ca/weblite/objc/util/CocoaUtils.java

@@ -0,0 +1,37 @@
+/*
+ * To change this template, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package ca.weblite.objc.util;
+
+import ca.weblite.objc.NSObject;
+import static ca.weblite.objc.RuntimeUtils.sel;
+import ca.weblite.objc.annotations.Msg;
+
+/**
+ *
+ * @author shannah
+ */
+public class CocoaUtils {
+    
+    
+    public static void dispatch_async(final Runnable r){
+        (new NSObject("NSObject"){
+            @Msg(selector="run", like="NSObject.finalize")
+            public void run(){
+                r.run();
+            }
+        }).send("performSelectorOnMainThread:withObject:waitUntilDone:", sel("run"), null, false);
+    }
+    
+    
+    public static void dispatch_sync(final Runnable r){
+        (new NSObject("NSObject"){
+            @Msg(selector="run", like="NSObject.finalize")
+            public void run(){
+                r.run();
+            }
+        }).send("performSelectorOnMainThread:withObject:waitUntilDone:", sel("run"), null, true);
+    }
+    
+}