iOS实现按钮点击选中与被选中切换功能

 @property (nonatomic, strong) UIButton *selecBtn;

//初始化按钮
UIButton * button = [UIButton buttonWithType:UIButtonTypeCustom];
//给按钮设置图片
[button setBackgroundImage:[UIImage imageNamed:imageArray[i]] forState:UIControlStateNormal];
[button setBackgroundImage:[UIImage imageNamed:SeleimageArray[i]] forState:UIControlStateDisabled];
      //添加方法
[button addTarget:self action:@selector(changeDataButton:) forControlEvents:UIControlEventTouchDown];

 - (IBAction)btnClick:(UIButton *)btn {
  self.selecBtn.enabled = YES;
  btn.enabled = NO;
  self.selecBtn = btn;
  }