UIButton状态:
UIControlStateNormal // 正常状态
UIControlStateHighlighted // 高亮状态
UIControlStateDisabled // 禁用状态
UIControlStateSelected // 选中状态
UIControlStateApplication //
UIControlStateReserved // 保留状态
UIButton类型:
UIButtonTypeCustom //自定义类型
添加图片：
灰色背景颜色：
UIButtonTypeRoundedRect //圆角类型
UIButtonTypeDetailDisclosure //细节展示按钮
UIButtonTypeInfoLight //浅色背景的信息按钮
UIButtonTypeInfoDark //暗色背景的信息按钮
UIButtonTypeContactAdd // 添加按钮
创建UIButton
1. UIButton *button = [[UIButton alloc] initWithFrame: CGRectMake (x, y, Width, Height)];
2. UIButton *button = [[UIButton buttonWithType:UIButtonTypeCustom] retain];
设置UIButton标题
[button setTitle:title forState:UIControlStateNormal];
设置UIButton标题颜色
[button setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
设置UIButton背景图片
[button setBackgroundImage:newImage forState:UIControlStateNormal];
设置UIButton背景颜色
button.backgroundColor = [UIColor clearColor];