This function searches recursively for the Cancel button in the visual hierarchy of the SearchBar control using the Depth-first search (DFS) approach. For that, we execute the function GetCancelButton. In the event handler Control_TextChanged, we can look now if the SearchBar control contains the Cancel button. Now, every time the text becomes changed, our event handler will fire. As our CustomSearchBarRenderer derives from the SearchBarRenderer, we can override the OnElementChanged event, which is called directly after the element has been created, and attach our event handler to the TextChanged event. Since the Cancel button is not always presented in the SearchBar control, but is created and deleted depending on the content of search field content, we have to override the button on each text change. In the custom renderer, you will then need to export the renderer for the type MySearchBar as follows. Note: If you do not want to override all controls but only some of them, then you need to implement a new control (e.g., MySearchBar) by deriving from the SearchBar class. That means that you will override all Xamarin SearchBar controls in your project. In this particular case, we override the SearchBar control and export it as a new SearchBar control (line 6). If (view.Subviews = null || = 0)Ĭustom renderers in Xamarin allows us to override UI components on a low-level. Private UIButton GetCancelButton(UIView view) UIButton button = GetCancelButton(Control) īutton.SetTitle("Go!", UIControlState.Normal) Private void Control_TextChanged(object sender, UISearchBarTextChangedEventArgs e) Protected override void OnElementChanged(ElementChangedEventArgs e)Ĭontrol.TextChanged += Control_TextChanged Public class CustomSearchBarRenderer : SearchBarRenderer Subsequently, replace the content of that class with the following code (Note: you will need to substitute the namespace OverrideSearchBarCancelButtonText with the namespace of your project): using
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