add callback

.gitignore

@@ -37,3 +37,5 @@ npm-debug.log
 # webstorm
 #
 *.iml
+
+Examples/ios/.DS_Store

lib/AppRegistryInjection.js

@@ -34,14 +34,14 @@ AppRegistry.registerComponent = function (appKey, getAppComponent) {
                 emitter.removeListener('siblings.update', this._update);
             };
 
-            _update(id, element) {
+            _update(id, element, callback) {
                 if (siblings.has(id) && !element) {
                     siblings.delete(id);
                 } else {
                     siblings.set(id, element);
                 }
                 updates.add(id);
-                this.forceUpdate();
+                this.forceUpdate(callback);
             };
 
             render() {

lib/SiblingsManager.js

@@ -10,15 +10,15 @@ const styles = StyleSheet.create({
 let uid = 0;
 
 export default class {
-    constructor(element) {
+    constructor(element, callback) {
         Object.defineProperty(this, '_id', {
             enumerable: false,
             configurable: false,
             writable: false,
             value: uid++
         });
 
-        this.update(element);
+        this.update(element, callback);
     };
 
     _offstreamElement(element) {
@@ -29,11 +29,11 @@ export default class {
 
     _id = null;
 
-    update(element) {
-        emitter.emit('siblings.update', this._id, this._offstreamElement(element));
+    update(element, callback) {
+        emitter.emit('siblings.update', this._id, this._offstreamElement(element), callback);
     };
 
-    destroy() {
-        emitter.emit('siblings.update', this._id, null);
+    destroy(callback) {
+        emitter.emit('siblings.update', this._id, null, callback);
     };
 }