开发工具上预览图可以全部显示出文字

安卓设备上也可以正常显示文字：

在ios上出现下面的样子，只有选中的 tab 才显示文字：

tab这样设置的：

"tabBar": {         "color": "rgb(102,102,102)",         "selectedColor": "#ffffff",         "borderStyle": "#ffffff",         "backgroundColor": "#000000",         "list": [             {                 "pagePath": "page/index/index",                 "iconPath": "images/index1.png",                 "selectedIconPath": "images/index2.png",                 "text": "首页"             },             {                 "pagePath": "page/classify/classify",                 "iconPath": "images/classify1.png",                 "selectedIconPath": "images/classify2.png",                 "text": "分类"             },             {                 "pagePath": "page/shopcar/shopcar",                 "iconPath": "images/shopcar1.png",                 "selectedIconPath": "images/shopcar2.png",                 "text": "进货车"             },             {                 "pagePath": "page/service/service",                 "iconPath": "images/service1.png",                 "selectedIconPath": "images/service2.png",                 "text": "找客服"             },             {                 "pagePath": "page/user/user",                 "iconPath": "images/person1.png",                 "selectedIconPath": "images/person2.png",                 "text": "我的"             }         ]     },

请问这个情况是兼容问题吗，还是我设置的问题