这是写得第二个比较大的小程序，主要是基于dialogbar，实现一个实时画图显示的小程序。你在dialogbar中选择颜色，然后在view里面画图，view里面的每一个小格对应于缩略图中的一个像素，可以实时更新显示。这个程序的主要目的是基于如何画图，以及dialogbar的使用和指针的一些用法。,This is written in a second relatively large small procedures, mainly based on dialogbar, the realization of a real-time drawing shows a small program. Dialogbar you choose the color, and then drawing in the view inside, view inside each cell corresponds to a small thumbnail of one of the pixels, can display real-time updates. The main purpose of this procedure is based on how the drawing, as well as the use and dialogbar some usage guidelines.