UIButton选中与未选中

1.自定义一个UIButton

UIButton *btn=[UIButton buttonWithType:UIButtonTypeCustom];

//设置选中时的状态

[btn setImage:[UIImage imageNamed:@"white_dot.png"] forState:UIControlStateSelected];

//设置未选中时的状态

[btn setImage:[UIImage imageNamed:@"dark_dot.png"] forState:UIControlStateNormal];

//默认设置为不选中状态(YES为选中状态)

[btn setSelected:NO];

/****

   if(btn.selected){//判断是否为选中状态

   }

*****/

btn.frame=CGRectMake(20,20, 25,25);//设置布局

[self.view addSubview:btn];//添加到视图中