Getting pixel data from UIImageView — works on simulator, not device

Question

Based on the responses to a previous question, I\'ve created a category on UIImageView for extracting pixel data. This works fine in the simulator, but not when deployed to

Answer 1

You could try the following alternative approach:

• create a CGBitmapContext
• draw the image into the context
• call CGBitmapContextGetData on the context to get the underlying data
• work out your offset into the raw data (based on how you created the bitmap context)
• extract the value

This approach works for me on the simulator and device.