ComponentOne Xamarin.iOS Documentation
Controls / FlexViewer / Features / Appearance
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    Although Xamarin controls match the native controls on all three platforms by default and are designed to work with both, light and dark, themes available on all platforms. But, there are several properties specific to the FlexViewer control which can be used to customize the appearance of the  loaded document and the area around it. The FlexViewer class provides the following set of properties that can be used to change the overall look and feel of the document:

    The following image shows FlexViewer with the customized appearance.

    To change the appearance of the loaded PDF document, use the following code. This example uses the sample code created in Quick Start section.

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    // Customize Appearance
    flexViewer.PageBackgroundColor = UIColor.White;
    flexViewer.BackgroundColor = UIColor.LightGray;
    flexViewer.PageBorderColor = UIColor.Black;
    flexViewer.Padding = new UIEdgeInsets(20, 20, 20, 20);
    flexViewer.PageSpacing = 5;