Getting Started Xamarin.iOS RadioButton (SfRadioButton)

This section explains the steps required to configure the SfRadioButton control in a real-time scenario and provides a walk-through on some of the customization features available in SfRadioButton control.

Add a SfRadioButton reference

Syncfusion Xamarin components are available in nuget.org. To add radio button to your project, open the NuGet package manager in Visual Studio, and search for “syncfusion.xamarin.buttons.ios”, and then install it.

Xamarin.iOS radio button NuGet

NOTE

Starting with v16.2.0.x, if you reference Syncfusion assemblies from trial setup or from the NuGet feed, you also have to include a license key in your projects. Please refer to this link to know about registering Syncfusion license key in your Xamarin application to use our components.

Create a Simple SfRadioButton

The SfRadioButton control is configured entirely in C# code. The following steps explain how to create a SfRadioButton and configure its elements.

Add namespace for referred assemblies

using Syncfusion.iOS.Buttons;

Refer the SfRadioButton control with declared suffix name for Namespace

using CoreGraphics;
using Syncfusion.iOS.Buttons;
using System;
using UIKit;

namespace RadioButton_Sample
{
    public partial class ViewController : UIViewController
    {
        public ViewController(IntPtr handle) : base(handle)
        {
        }

        public override void ViewDidLoad()
        {
            base.ViewDidLoad();
            SfRadioButton radioButton = new SfRadioButton();
            View.AddSubview(radioButton);
        }

        public override void DidReceiveMemoryWarning()
        {
            base.DidReceiveMemoryWarning();
            // Release any cached data, images, etc that aren't in use.
        }
    }
}

Setting caption

The radio button caption can be defined using the SetTitle method of SfRadioButton. This caption normally describes the meaning of the radio button and it displays next to radio button.

SfRadioButton radioButton = new SfRadioButton(); 
radioButton.SetTitle("RadioButton", UIControlState.Normal);

Xamarin.iOS radio button caption text

Change the radio button state

The two different visual states of the SfRadioButton are:

  • Checked
  • Unchecked

You can change the state of the radio button using the IsChecked property of SfRadioButton. In the checked state, an inner circle is added to the visualization of radio button.
The radio buttons are used when there is a list of two or more options or group that are mutually exclusive and the user must select exactly one choice, such as “Select Gender” or “Choose the best option!”.

SfRadioGroup radioGroup = new SfRadioGroup();
SfRadioButton male = new SfRadioButton();
male.IsChecked = true;
male.SetTitle("Male",UIControlState.Normal);
SfRadioButton female = new SfRadioButton();
female.SetTitle("Female",UIControlState.Normal);
radioGroup.AddArrangedSubview(male);
radioGroup.AddArrangedSubview(female);

NOTE

SfRadioButtons are mutually exclusive among them when they are defined within SfRadioGroup.

Xamarin.iOS radio button states

This demo can be downloaded from this link.