//两个按钮 点击那个 另一个就取消选择
//也可以取消两个按钮的选择状态
//也可以对单独一个按钮 进行选择和取消

//微信支付

• (IBAction)btnWeChatClick:(id)sender {
  if (_btnZFB.selected == YES) {
  _btnZFB.selected = NO;
  _btnWeChat.selected = YES;
  }else{
  _btnWeChat.selected = !_btnWeChat.selected;
  }

}
//支付宝支付

• (IBAction)btnZFBClick:(id)sender {

  if (_btnWeChat.selected == YES) {
  _btnWeChat.selected = NO;
  _btnZFB.selected = YES;
  }else{
  _btnZFB.selected = !_btnZFB.selected;
  }

}