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map.add() 时报错

报错：[esri.support.LayersMixin] #add() The item being added is not a Layer or a Promise that resolves to a Layer.代码如下，使用ios的UIWebview时报错,使用WKWebview没有此问题：
var layer = new TileLayer({
url: "http://cache1.arcgisonline.cn/ ... ot%3B
});
var imgBasemap = new Basemap({
baseLayers: [layer]
});
var map = new Map({
//basemap: 'topo-vector',
basemap: imgBasemap,
});
map.add(imgBasemap);