Method setItemChecked

packages/fairygui/src/widgets/PopupMenu.ts:202–210

* Set item checked state by name * 通过名称设置菜单项选中状态

(name: string, bChecked: boolean)

     * 通过名称设置菜单项选中状态
     */
    public setItemChecked(name: string, bChecked: boolean): void {
        const item = this._list.getChild(name);
        if (item && item instanceof GButton) {
            const c = item.getController('checked');
            if (c) {
                c.selectedIndex = bChecked ? 2 : 1;
            }
        }
    }

    /**
     * Check if item is checked by name