在tabBar中，当有4个图标时，在android中正常，但在ios中出现换行，背景变成黑色


"tabBar":{
"color":"#000",
"selectedColor":"#38c258",
"backgroundColor":"",
"borderStyle":"black",
"list":[
{
"pagePath":"pages/index/index",
"text":"购票",
"iconPath":"pages/img/gp.png",
"selectedIconPath":"pages/img/gp1.png"
},
{
"pagePath": "pages/common/index",
"text": "乘车",
"iconPath": "pages/img/bs.png",
"selectedIconPath": "pages/img/bs1.png"
},
{
"pagePath": "pages/mine/index",
"text": "我的",
"iconPath": "pages/img/me.png",
"selectedIconPath": "pages/img/me1.png"
},
{
"pagePath": "pages/message/index",
"text": "消息",
"iconPath": "pages/img/message.png",
"selectedIconPath": "pages/img/message1.png"
}
]
}

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