Fix UI bug on post detail. reviewed by redding.

@@ -84,14 +84,16 @@ export default class SubjectPost extends Component {
         Keyboard.addListener('keyboardWillChangeFrame',(event)=>{
 
             let kbdHeight = height - event.endCoordinates.screenY;
-            if (this.boardInView) {
-                if (kbdHeight>0) {
-                    this.setState({imageState: 0});
+            if (kbdHeight>0) {
+                this.boardInView = false;
+                this.setState({imageState: 0});
+            } else {
+                if (this.boardInView) {
+                    if (kbdHeight>0) {
+                        this.setState({imageState: 0});
+                    }
+                    return;
                 }
-                return;
-            }
-
-            if (kbdHeight == 0) {
                 this.currentReplyState = ReplyState.replyLZ;
                 this.setState({replyState: ReplyState.replyNone});
             }