Ruben has a second MonoTouch post where he creates a simple MonoTouch app that demonstrates how to use Quartz2D to draw custom progress bars. You can download the MonoDevelop project.
The app shows how to draw a simple two color progress bar using alpha transparency and a simple two color gradient progress bar. There are sliders that let you control the colors, transparency level, and progress percentage. The code uses the CGBitmapContext class to create an image and loads it into UIImageView.


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