Merge branch 'master' into update_readme

Author: zhuxingwei

README-ZH.md

@@ -49,6 +49,7 @@ https://github.com/UnityTech/DocCN 查看。
 ## 使用要求
 
 #### Unity
+
 安装 **Unity 2018.4.10f1(LTS)** 或 **Unity 2019.1.14f1** 及其更高版本。 你可以从[https://unity3d.com/get-unity/download](https://unity3d.com/get-unity/download)下载最新的Unity。
 
 #### UIWidgets包

README.md

@@ -58,6 +58,7 @@ open-sourced @https://github.com/UnityTech/DocCN.
 ## Requirements
 
 #### Unity
+
 Install **Unity 2018.4.10f1 (LTS)** or **Unity 2019.1.14f1** and above. You can download the latest Unity on https://unity3d.com/get-unity/download.
 
 #### UIWidgets Package

Runtime/material/bottom_navigation_bar.cs

@@ -348,7 +348,7 @@ public override Widget build(BuildContext context) {
                     child: text
                 );
             }
-            else if (this.showUnselectedLabels) {
+            else if (!this.showUnselectedLabels) {
                 text = new FadeTransition(
                     opacity: this.animation,
                     child: text
@@ -576,6 +576,7 @@ public override Widget build(BuildContext context) {
             Color backgroundColor = null;
             switch (this.widget.type) {
                 case BottomNavigationBarType.fix:
+                    backgroundColor = this.widget.backgroundColor;
                     break;
                 case BottomNavigationBarType.shifting:
                     backgroundColor = this._backgroundColor;