UIPageControl的subview中有UIImageView。
遍历subview找到UIImageView 类后,把他的image换成你的图片就行了
NSArray *subView = self.subviews;
for (int i = 0; i < [subView count]; i++)
{
UIImageView *dot = [subView objectAtIndex:i];
dot.image = (self.currentPage == i ? imagePageStateHighlighted : imagePageStateNormal);
}