support dismissModal by id

ios/RNNBridgeModule.m

@@ -61,15 +61,17 @@ RCT_EXPORT_METHOD(showModal:(NSDictionary*)layout)
 
 RCT_EXPORT_METHOD(dismissModal:(NSString*)containerId)
 {
-	UIViewController *root = UIApplication.sharedApplication.delegate.window.rootViewController;
-	while(root.presentedViewController) {
-		root = root.presentedViewController;
-	}
-
+	UIViewController *root = [[RNN instance].store findContainerForId:containerId];
 	
-	[root dismissViewControllerAnimated:YES completion:^{
+	//	while(root.presentedViewController) {
+	//		root = root.presentedViewController;
+	//	}
+	if (root) {
 		
-	}];
+		[root dismissViewControllerAnimated:YES completion:^{
+			
+		}];
+	}
 }
 
 - (void)assertReady

playground/e2e/app.test.js

@@ -61,6 +61,15 @@ describe('app', () => {
     elementByLabel('Dismiss Modal').tap();
     expect(elementByLabel('React Native Navigation!')).toBeVisible();
   });
+  
+  it('dismiss unknown screen id', () => {
+    elementByLabel('Show Modal').tap();
+    expect(elementByLabel('Modal Stack Position: 1')).toBeVisible();
+    elementByLabel('Dismiss Unknown Modal').tap();
+    expect(elementByLabel('Modal Stack Position: 1')).toBeVisible();
+    elementByLabel('Dismiss Modal').tap();
+    expect(elementByLabel('React Native Navigation!')).toBeVisible();
+  });
 
   xit('dismiss modal by id', () => {
     elementByLabel('Show Modal').tap();

playground/src/containers/ModalScreen.js

@@ -14,6 +14,7 @@ class ModalScreen extends Component {
     this.onClickShowModal = this.onClickShowModal.bind(this);
     this.onClickDismissModal = this.onClickDismissModal.bind(this);
     this.onClickDismissPreviousModal = this.onClickDismissPreviousModal.bind(this);
+    this.onClickDismissUnknownModal = this.onClickDismissUnknownModal.bind(this);
   }
   render() {
     return (
@@ -22,8 +23,10 @@ class ModalScreen extends Component {
         <Text style={styles.footer}>{`Modal Stack Position: ${this.getModalPosition()}`}</Text>
         <Button title="Show Modal" onPress={this.onClickShowModal} />
         <Button title="Dismiss Modal" onPress={this.onClickDismissModal} />
+        <Button title="Dismiss Unknown Modal" onPress={this.onClickDismissUnknownModal} />
         {this.props.previousModalId ? (<Button title="Dismiss Previous Modal" onPress={this.onClickDismissPreviousModal} />) : undefined}
         <Text style={styles.footer}>{`this.props.id = ${this.props.id}`}</Text>
+        
       </View>
     );
   }
@@ -45,6 +48,9 @@ class ModalScreen extends Component {
   onClickDismissPreviousModal() {
     Navigation.dismissModal(this.props.previousModalId);
   }
+  onClickDismissUnknownModal() {
+    Navigation.dismissModal('unknown');
+  }
 
   getModalPosition() {
     return (this.props.modalPosition || 1);