UIButton常用方法和属性

UIButton是继承UIControl的子类,而UIControl的又是从UIview中派生出来的.下面介绍UIButton的一些常用属性和方法:

1.UIButoon可使用initWithFrame,buttonWithType两张方法创建

1) initWithFrame方法:

UIButton *btn=[[UIButton alloc]initWithFrame:CGRectMake(60, 60, 200, 60)];

btn.backgroundColor=[UIColor greenColor];

[btn setTitle:@"btn1" forState:UIControlStateNormal];

[self.view addSubview:btn];

2) buttonWithType方法:

//buttonWithType初始化按钮

UIButton *btn2=[UIButton buttonWithType:UIButtonTypeRoundedRect];

CGRect rect=CGRectMake(60, 160, 200, 60);

btn2.frame=rect; //设置button的frame

btn2.tag=1001; //设置tag值

btn2.backgroundColor=[UIColor colorWithRed:30/255.0 green:200/255.0 blue:125/255.0 alpha:1.0]; //使用rgb设置按钮的背景颜色

[btn2 setTitle:@"btn2" forState:UIControlStateNormal]; //为按钮设置标题

[btn2 addTarget:self action:@selector(btn2Pressed) forControlEvents:UIControlEventTouchDown]; //为按钮添加事件

[self.view addSubview:btn2];

btn2的响应事件:

-(void)btn2Pressed{

NSLog(@"button pressed");

}

3. UIButtonType:

typedef enum {

UIButtonTypeCustom = 0, // no button type 自定义，无风格

UIButtonTypeRoundedRect, // rounded rect, flat white button, like in address card 白色圆角矩形，类似偏好设置表格单元或者地址簿卡片

UIButtonTypeDetailDisclosure,//蓝色的披露按钮，可放在任何文字旁

UIButtonTypeInfoLight,//微件(widget)使用的小圆圈信息按钮，可以放在任何文字旁

UIButtonTypeInfoDark,//白色背景下使用的深色圆圈信息按钮

UIButtonTypeContactAdd,//蓝色加号(+)按钮，可以放在任何文字旁

} UIButtonType;

2.UIButton的状态:

typedef NS_OPTIONS(NSUInteger, UIControlState) {

UIControlStateNormal = 0, //正常状态

UIControlStateHighlighted = 1 << 0, //高亮状态 // used when UIControl isHighlighted is set

UIControlStateDisabled = 1 << 1, //禁用状态

UIControlStateSelected = 1 << 2, //选中状态 // flag usable by app (see below)

UIControlStateApplication = 0x00FF0000, // additional flags available for application use

UIControlStateReserved = 0xFF000000 // flags reserved for internal framework use

};

3.UIButton的事件类型:

typedef NS_OPTIONS(NSUInteger, UIControlEvents) {

UIControlEventTouchDown = 1 << 0, // on all touch downs

UIControlEventTouchDownRepeat = 1 << 1, // on multiple touchdowns (tap count > 1)

UIControlEventTouchDragInside = 1 << 2,

UIControlEventTouchDragOutside = 1 << 3,

UIControlEventTouchDragEnter = 1 << 4,

UIControlEventTouchDragExit = 1 << 5,

UIControlEventTouchUpInside = 1 << 6,

UIControlEventTouchUpOutside = 1 << 7,

UIControlEventTouchCancel = 1 << 8,

UIControlEventValueChanged = 1 << 12, // sliders, etc.

UIControlEventEditingDidBegin = 1 << 16, // UITextField

UIControlEventEditingChanged = 1 << 17,

UIControlEventEditingDidEnd = 1 << 18,

UIControlEventEditingDidEndOnExit = 1 << 19, // 'return key' ending editing

UIControlEventAllTouchEvents = 0x00000FFF, // for touch events

UIControlEventAllEditingEvents = 0x000F0000, // for UITextField

UIControlEventApplicationReserved = 0x0F000000, // range available for application use

UIControlEventSystemReserved = 0xF0000000, // range reserved for internal framework use

UIControlEventAllEvents = 0xFFFFFFFF