Awesome

ImageDrawingController

It is a controller for drawing on an image. User can pass an image to the controller and mention the desired pencil colour and pencil brush width and start drawing.

Feature: Draw on an image with any color and any brush width.

System Requirements: Need iOS 7.0 or higher.

Usage:

imageDrawingController *controller=[[imageDrawingController alloc]init];
controller.canvasImageForDrawing=_selectedImageView.image;
controller.delegate=self;
controller.pencilColor=[UIColor redColor];
controller->brushThickness=5.0f;
UINavigationController *navigationController=[[UINavigationController   alloc]initWithRootViewController:controller];
[self presentViewController:navigationController animated:YES completion:nil];

 setting the pencil colour and brush width is optional.