摘自：欧阳大神的UI教学视频
UIButton 的类型
1、UIButtonTypeRoundedRect 圆角按钮
2、UIButtonTypeDetailDisclosure 详情按钮
3、UIButtonTypeContactAdd 加号按钮
4、UIButtonTypeInfoDark 白色信息按钮
5、UIButtonTypeInfoLight 灰色信息按钮
6、 UIButtonTypeCustom 自定义按钮
UIButton的常用属性
1、frame 坐标
2、tag 标签
3、adjustsImageWhenHighlighted 高亮状态下按钮是否变暗
4、adjustsImageWhenDisabled 禁用状态下按钮是否变暗
5、showsTouchWhenHighlighted 按钮高亮状态下是否发光
UIButton的常用方法
1、- (void)setTitle:(NSString *)title forState:(UIControlState)state;
2、- (void)setTitleColor:(UIColor *)color forState:(UIControlState)state;
3、- (void)setTitleShadowColor:(UIColor *)color forState:forState:(UIControlState)state;
4、- (void)setImage:(UIImage *)image forState:(UIControlState)state;
5、- (void)setBackgroundImage:(UIImage *)image forState:(UIControlState)state;
6、- (void)setTintColor:(UIColor *)color;
UIButton 的事件
1、- (void)addTarget:(id)target action:(SEL)action forControlEvent:(UIControlEvents)controlEvents
2、- (void)removeTarget:(id)target action:(SEL)action forControlEvent:(UIControlEvents)controlEvents
UIButton修改图片和标题位置
1、默认情况下从工厂方法中生成的按钮，图片在左边，标题在右边
2、通过继承UIButton重写方法来设置自己想要的位置
3、按钮类型需为UIButtonTypeCustom