Product:
Customize PDFViewCtrl
You can change the color themes inside document viewers.
Viewer theme customization in Xamarin.Android
Day and night themes
Find out more about the sleek day and night themes available for the viewer UI.
Page Color mode
Pages can be viewed in various color modes, find out more here.
Change color theme in Xamarin.iOS viewer
PDFViewCtrl has three special color modes: night mode, inverted color mode, and custom color mode. In night mode, colors are adjusted to improve reading at night, in inverted color mode, all colors are inverted, and in custom color mode, you can set a custom color for text and the background color.
Color modes from left to right: normal color mode, inverted color mode, night mode and custom color mode.
Set the color mode
To set the color mode:
- Find the constant value of the color mode
Color mode | Constant value |
|---|---|
Normal color mode | |
Night mode | |
Inverted color mode | |
Custom color mode |
|
- Call
SetColorPostProcessMode. - Optionally, set the
PDFViewCtrlbackground color for the best visual result. You can set background color by callingSetClientBackgroundColor(Xamarin.Android) orSetBackgroundColor(Xamarin.iOS).For example, set the background color to black for night mode:
C#
- If you are using
postprocess_gradient_map, callPDFViewCtrl.SetColorPostProcessColorsto set the white and black points. For example, for a sepia effect, try:
C#
- Update
PDFViewCtrlto redraw the contents:Sample result when usingpostprocess_gradient_mapand a light/dark brown for the white/black color:
C#
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