Creating images from an array of colors

ImageDrawer.m

// Make an image all of one size, in whatever color.
+ (UIImage *)createTestImageWithWidth:(CGFloat)width
                               height:(CGFloat)height
                                color:(UIColor *)color {
  CGRect rect = CGRectMake(0, 0, width, height);
  UIGraphicsBeginImageContext(rect.size);
  [color set];
  UIRectFill(rect);
  UIImage *testImage = UIGraphicsGetImageFromCurrentImageContext();
  UIGraphicsEndImageContext();
  return testImage;
}

// Create a 3x3 image alternating between two colors.
+ (UIImage *)createTestImageNineQuadrantsWithColor1:(UIColor *)color1
                                             color2:(UIColor *)color2 {
  // Create an image with 4 quadrants of color.
  CGRect rect = CGRectMake(0, 0, 3.0, 3.0);
  UIGraphicsBeginImageContext(rect.size);
  [color1 set];
  UIRectFill(CGRectMake(0, 0, 1, 1));
  UIRectFill(CGRectMake(2, 0, 1, 1));
  UIRectFill(CGRectMake(1, 1, 1, 1));
  UIRectFill(CGRectMake(0, 2, 1, 1));
  UIRectFill(CGRectMake(2, 2, 1, 1));

  [color2 set];
  UIRectFill(CGRectMake(1, 0, 1, 1));
  UIRectFill(CGRectMake(0, 1, 1, 1));
  UIRectFill(CGRectMake(2, 1, 1, 1));
  UIRectFill(CGRectMake(1, 2, 1, 1));
  UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
  UIGraphicsEndImageContext();
  return image;
}

// Create a 2x2 image with each quadrant a different color.
+ (UIImage *)createTestImageWithFourColors {
  // Create an image with 4 quadrants of color.
  CGRect rect = CGRectMake(0, 0, 2.0, 2.0);
  UIGraphicsBeginImageContext(rect.size);
  [[UIColor redColor] set];
  UIRectFill(CGRectMake(0, 0, 1, 1));
  [[UIColor greenColor] set];
  UIRectFill(CGRectMake(1, 0, 1, 1));
  [[UIColor blueColor] set];
  UIRectFill(CGRectMake(0, 1, 1, 1));
  [[UIColor blackColor] set];
  UIRectFill(CGRectMake(1, 1, 1, 1));
  UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
  UIGraphicsEndImageContext();
  return image;
}