UIPageControll - 图片格式

page.pageIndicatorTintColor = [UIColor redColor];
page.currentPageIndicatorTintColor = [UIColor greenColor];

page.currentPageIndicatorTintColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"dot_selected"]];
page.pageIndicatorTintColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"dot_normal"]];

[page setValue:[UIImage imageNamed:@"compose_keyboard_dot_normal"] forKeyPath:@"pageImage"];
[page setValue:[UIImage imageNamed:@"compose_keyboard_dot_selected"] forKeyPath:@"currentPageImage"];