UIButton按钮是IOS开发中最常用的控件，作为IOS基础学习教程知识 ，初学者需要了解其基本定义和常用设置，以便在开发在熟练运用。

第一、UIButton的定义

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

能够定义的button类型有以下6种，

typedef enum {

UIButtonTypeCustom = 0, 自定义风格

UIButtonTypeRoundedRect, 圆角矩形

UIButtonTypeDetailDisclosure, 蓝色小箭头按钮，主要做详细说明用

UIButtonTypeInfoLight, 亮色感叹号

UIButtonTypeInfoDark, 暗色感叹号

UIButtonTypeContactAdd, 十字加号按钮

} UIButtonType;

第二、设置frame

button1.frame = CGRectMake(20, 20, 280, 40);

[button setFrame:CGRectMake(20,20,50,50)];

第三、button背景色

button1.backgroundColor = [UIColor clearColor];

[button setBackgroundColor:[UIColor blueColor]];

第四、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

};

@property(nonatomic,getter=isEnabled)BOOL enabled; // default is YES. if NO, ignores touch events and subclasses may draw differently

@property(nonatomic,getter=isSelected)BOOL selected; // default is NO may be used by some subclasses or by application

@property(nonatomic,getter=isHighlighted)BOOL highlighted;

第五 、设置button填充图片和背景图片

[buttonsetImage:[UIImageimageNamed:@"checkmarkControllerIcon"]forState:UIControlStateNormal];

[buttonsetBackgroundImage:[UIImageimageNamed:@"checkmarkControllerIcon"]forState:UIControlStateNormal];

第六、设置button标题和标题颜色

[button1 setTitle:@"点击" forState:UIControlStateNormal];

[buttonsetTitleColor:[UIColorredColor]forState:UIControlStateNormal];

第七、设置按钮按下会发光

button.showsTouchWhenHighlighted=NO;

第八、添加或删除事件处理

[button1 addTarget:self action:@selector(butClick:) forControlEvents:UIControlEventTouchUpInside];

[btn removeTarget:nil action:nil forControlEvents:UIControlEventTouchUpInside];

第九、 设置按钮内部图片间距和标题间距

UIEdgeInsets insets; // 设置按钮内部图片间距

insets.top = insets.bottom = insets.right = insets.left = 10;

bt.contentEdgeInsets = insets;

bt.titleEdgeInsets = insets; // 标题间距