I have an UIImage that is a line drawn black & white image in a UIImageView. How can I fill inside of the lines with color on touch?

I have this UIImage in a UIImageView:

我在UIImageView中有这个UIImage：

I want it so that when a user touches inside of any box, it fills with a blue color.

我想要它，以便当用户触摸任何盒子内部时，它会填充蓝色。

This is just an example... the actual image I am going to use is not squares, but a more complex line drawing, so drawing it with code would be extremely complex.

这只是一个例子......我要使用的实际图像不是正方形，而是更复杂的线条图，因此用代码绘制它将非常复杂。

What is the best way to accomplish this?

完成此任务的最佳方法是什么？

2 个解决方案

#1

You can go with flood fill Algorithm.

你可以使用泛洪填充算法。

That is the best way to fill any image.

这是填充任何图像的最佳方式。

there is some links for that

有一些链接

http://en.wikipedia.org/wiki/Flood_fill

http://en.wikipedia.org/wiki/Flood_fill

and get sample code from here

并从这里获取示例代码

Flood Fill

洪水填充

#2

Use UIView and implement its drawrect method to show the colors.Use QuartzCore and CoreGraphics to draw. Implement the touch with drawing of color to the view.

使用UIView并实现其drawrect方法来显示颜色。使用QuartzCore和CoreGraphics绘制。在视图中使用颜色绘制实现触摸。