nunit UITest xamarin.forms：如何滚动选择器？

Question

我正在尝试为Xamarin.Forms项目创建UITest。在Android上进行测试。 我尝试使用Xamarin forum上提供的一些inf，但没有运气。

Picker的国家/地区列表：

List<country> countryList = new List<country>({id="GB", name="United Kingdom"}, {id="US", name="United States"}.... etc);

Picker代码：

        var countryPicker  = new Picker();
        countryPicker.SetBinding(Picker.SelectedIndexProperty, "myIndex");
        countryPicker.BindingContext = getCountry;
        countryPicker.BackgroundColor = Color.White;
        countryPicker.AutomationId = "countryPicker";
        countryPicker.SelectedIndexChanged += ((s, e) =>
            {
                    foreach (var element in countryList)
                    {
                        if (element.name.Equals(countryPicker.Items[countryPicker.SelectedIndex]))
                        {
                            getCountry.myCountry = element.id;
                        }
                    }
            });

        //adding all the countries to the list
        foreach (var item in countryList)
        {
            countryPicker.Items.Add(item.name);

        }

nunit代码：

app.Query(c=>c.Marked("countryPicker").Invoke("selectValue", "United States"));

答案：查询标记（＆＃34; countryPicker＆＃34;）。调用（＆＃34; selectValue＆＃34;，＆＃34;美国＆＃34;）给出1个结果。 但没有任何事情发生 - 选择没有完成！ 我试图为＆＃34; US＆＃34;选择价值。 - 同样，没有结果。

我错过了什么吗？

Answer 1

打开Xamarin.Form Picker，Select，＆amp;测试结果（仅限Android）：

// Open up the picker
app.Tap(x => x.Marked("countryPicker"));

// Try to scroll and find the text item only 5 times
for (int i = 0; i< 5; i++)
{
    if (app.Query(m => m.Text("United States")).Length == 0)
        app.ScrollDown(x => x.Id("select_dialog_listview"));
else
    {
        app.Tap(x => x.Text("United States"));
        break;
    }
}
Assert.IsTrue(app.Query("countryPicker")[0].Text == "United States");

打开Xamarin.Form Picker，Select，＆amp;测试结果（仅限iOS）：

/// Open up the picker
app.Tap(x => x.Marked("countryPicker"));

// Assuming a single column picker
var picker = app.Query(x => x.Class(pickerClass).Index(0));
// Try to scroll and find the text item only 5 times
for (int i = 0; i < 5; i++)
{
    if (app.Query(m => m.Text("United States")).Length == 0)
        app.ScrollDown(x => x.Class("UIPickerTableView").Index(0));
    else
    {
        app.Tap(x => x.Text("United States"));
        break;
    }
}
app.Tap(x => x.Class("UIToolbarTextButton"));
Assert.IsTrue(app.Query("countryPicker")[0].Text == "United States");

Answer 2

以下解决方案现在也可用，并且当选择器的值超出上面设置的5个滚动限制时，这些解决方案也不会中断。在此示例中，我使用了NumberPicker，但是相同的方法也可以用于CountryPicker：

if (platform == Platform.iOS) {
    app.Query(x => x.Class("UIPickerView").Invoke("selectRow", 3, "inComponent", 0, "animated", true));

    // This is a hack to move the item so that Xamarin Forms will generate the event to update the UI
    var rect = app.Query(x => x.Class("UIPickerTableView").Index(0).Child()).First().Rect;
    app.DragCoordinates(rect.CenterX, rect.CenterY, rect.CenterX, rect.CenterY + 20);

    app.Tap(c => c.Text("Done"));
}
else {
    //NOTE: On Android the values appear to be out by one - setting 4 selects the 3rd value.
    var results = app.Query(c => c.Class("numberPicker").Invoke("setValue", 4));
    var text = app.Query("PickerControl")[0].Text;
    app.Tap(c => c.Text(text));

    //You can also do it like this on Android:
    //    app.ScrollDownTo(m => m.Text("White"), x => x.Id("select_dialog_listview"));
    //    app.Tap(x => x.Text("White"));
    //    Assert.IsTrue(app.Query("PickerControl")[0].Text == "White");
}

您可以在打开选择器后使用这些解决方案。

特别值得注意的是iOS上的小“微调”-如果您使用selectRow选择选择器值，则UI不会标记为已更新。这种黑客行为会触发必要的事件，并更新用户界面。