c# - 如何在 PickerRenderer xamarin forms IOS 中从右侧填充箭头

Question

public class CustomPickerRenderer : PickerRenderer
{
protected override void OnElementChanged(ElementChangedEventArgs<Xamarin.Forms.Picker> e)
{
base.OnElementChanged(e);
if (this.Control != null)
{
var downarrow = UIImage.FromBundle("your image");
var textField = this.Control;
textField.RightViewMode = UITextFieldViewMode.Always;
textField.RightView = new UIImageView(downarrow);
}
}
}

我在 IOS 上使用 PickerRenderer，我想从右侧留出一些空间。如何从右侧留出填充？这里图片，请查看

Answer 1

Xamarin 选择器箭头解决方法

除了@Pratik 帖子外，除非您为图像创建点击事件，否则单击箭头将不起作用。

XAML

            <Grid>
                <Picker
                    x:Name="catPicker"
                    Title="Select Type"/>
                <Image
                    Margin="5"
                    HorizontalOptions="End"
                    Source="down_arrow">
                    <Image.GestureRecognizers>
                        <TapGestureRecognizer Tapped="Arrow_OnTapped" />
                    </Image.GestureRecognizers>
                </Image>
            </Grid>

C#

    private void Arrow_OnTapped(object sender, EventArgs e)
    {
        catPicker.Focus();
    }