[UI基础]UIButton

UIButton继承关系如下：

　　UIButton-->UIControl-->UIView-->UIResponder-->NSObject

1、创建一个UIButton对象

　　UIButton提供了如下类方法来创建一个指定类型的UIButton对象

1 + (void)buttonWithType:(UIButtonType)buttonType

　　UIButtonType是一个枚举类型

1 typedef enum{
2     UIButtonTypeCustom = 0;            //此属性表明，该按钮的外观行为主要依靠开发者的设置
3     UIButtonTypeSystem,                //IOS系统默认的按钮风格
4     UIButtonTypeDetailDisclosure,      //用于显示当前列表项的详情
5     UIButtonTypeInfoLight,          　　//该按钮用于显示简短的说明(Light)
6     UIButtonTypeInfoDark, 　　　　　　　　//该按钮用户显示简短的说明(Dark)
7     UIButtonTypeContactAdd, 　　　　　　  //该按钮通常用于添加联系人
8     UIButtonTypeRoundedRect, 　　　　　　//圆角矩形的按钮
9 } UIButtonType;

　　UIButton *button=[[UIButton buttonWithType:(UIButtonType);

2、设置frame

　　button.frame = CGRectMake(20, 20, 280, 40);

　　[button setFrame:CGRectMake(20, 20, 280, 40)];

3、button 背景颜色

　　button.backgroundcolor = [UIColor clearColor];

　　[button setBackgroundColor:[UIColor clearColor]];

4、state状态

　　forState: 这个参数的作用是定义按钮的文字或图片在何种状态下才会显现　

enum {
UIControlStateNormal = 0,  //常规状态显现
 UIControlStateHighlighted = 1 << 0, //高亮状态显现
 UIControlStateDisabled = 1 << 1, //禁用的状态才会显现
 UIControlStateSelected = 1 << 2, //选中状态
 UIControlStateApplication = 0x00FF0000, //当应用程序标志时
 UIControlStateReserved = 0xFF000000 //为内部框架预留，可以不管他
};

5、UIButton常用属性　

//设置对应状态的标题内容 default is nil. title is assumed to be single line

- (void)setTitle:(NSString *)title forState:(UIControlState)state;

//设置对应状态的标题颜色

- (void)setTitleColor:(UIColor *)color forState:(UIControlState)state;

//设置对应状态的标题阴影颜色

- (void)setTitleShadowColor:(UIColor *)color forState:(UIControlState)state;

//设置对应状态的按钮的图片

- (void)setImage:(UIImage *)image forState:(UIControlState)state;

//设置对应状态的按钮背景图片

- (void)setBackgroundImage:(UIImage *)image forState:(UIControlState)state;