多级nui.PopPicker setSelectedValue 没效果

cityPicker3.pickers[0].setSelectedValue (p, 0, function () {
// 设定市初始值
cityPicker3.pickers[1].setSelectedValue (city, 0, function () {
// 设定区初始值
cityPicker3.pickers[2].setSelectedValue(district);
});
});