MyViewController.m

@implementation MyViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
	
	static const NSUInteger const width = 32;
	static const NSUInteger const height = 32;
	uint32_t pixels[width * height];
	for (int p = 0; p < 1024; ++p)
	{
		pixels[p] = 0xffff0000;
	}
	
	CGContextRef ctx = CGBitmapContextCreate(pixels, width, height, 8, width * sizeof(uint32_t), CGColorSpaceCreateDeviceRGB(), kCGImageAlphaPremultipliedLast);
	
	CGImageRef image = CGBitmapContextCreateImage(ctx);
	
	UIImage *img = [UIImage imageWithCGImage:image];
	
	UIImageView *imgView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 32, 32)];
	imgView.image = img;
	
	[self.view addSubview:imgView];
}

@end