extjs:initcomponent方法中如何等待promise响应?

我已经实现了 initComponent 方法到 Container 等级和装载 items 通过A配置 Promise 方法。

期间的事情 debugging 先去 callParent 行,然后执行转到 许诺 方法…我必须重新加载浏览器才能获取 许诺 反应。

我试过了 then() 方法在 内部组件 但会出错。我如何才能实现这种用法?

-容器类 内部组件 ;

Ext.define('MyApp.view.Bar', {
    extend: 'Ext.container.Container',
    xtype: 'barview',
    requires: [],
    controller: 'barctrl',
    viewModel: {
        type: 'barvm'
    },

    initComponent: function () {
        let me = this;
        let fooInfo = MyApp.FooInfoClass.getFooInfo(); //There is a debugger in FooInfoClass but miss this one

        if (fooInfo) {
            if (fooInfo.self) {
                me.items = [
                    {
                        xtype: 'componentA'
                    }
                ];
            } else if (fooInfo.reference) {
                me.items = [
                    {
                        xtype: 'componentB'
                    }
                ];
            } else {
                me.items = [
                    {
                        xtype: 'componentC'
                    }
                ];
            }
        }

        debugger //Firstly comes to this one then goes to Promise 
        me.callParent(arguments);
    }
});

-承诺类别和方法;

Ext.define('MyApp.FooInfoClass', {
    requires: [],
    singleton: true,
    endpoint: MyApp.Url(),

    getFooInfo: function () {
        let me = this;
        let responseInfo = localStorage.getItem('foo-info');

        return JSON.parse(responseInfo);
    },

    setFooInfo: function (foo) {
        let me = this;

        me.foo = JSON.stringify(foo);
        localStorage.setItem(me.fooInfo, me.foo);
    },

    fooInfo: function () {
        let me = this;

        return new Ext.Promise(function (resolve, reject) {
            Ext.Ajax.request({
                url: me.endpoint + '/info',

                success: function(response, opts) {
                    let obj = Ext.decode(response.responseText);
                    let data = obj.data[0];
                    debugger //Secondly comes to here!
                    me.foo = data;
                    me.setFooInfo(me.foo);
                    resolve(me.foo);
                },

                failure: function(response, opts) {
                    console.log('server-side failure with status code ' + response);
                    reject(response);
                }
            });
        });
    }
});