Following functions make the the creation and drawing of programmatical generated UIImages a little bit easier. Call `CreateBitmapContext(CGSize)` to get a CGContextRef you can draw into. Afterwards, just call `CreateUIImageFromBitmap(CGContextRef)` to return a common usable UIImage instance and free up any used resources. This Gist is based on h…

gistfile1.m

CGContextRef CreateBitmapContext(CGSize size) {
    CGColorSpaceRef space = CGColorSpaceCreateDeviceRGB();
    CGContextRef ctx = CGBitmapContextCreate(nil, size.width, size.height, 8, size.width * (CGColorSpaceGetNumberOfComponents(space) + 1), space, kCGImageAlphaPremultipliedLast);
    CGColorSpaceRelease(space);
    
    return ctx;
}

UIImage* CreateUIImageFromBitmapContext(CGContextRef ctx) {
    CGImageRef cgImage = CGBitmapContextCreateImage(ctx);
    UIImage *image = [UIImage imageWithCGImage:cgImage];
    
    CGImageRelease(cgImage);
    CGContextRelease(ctx);
    
    return image;
}