原来是这样实现这种效果的啊，不需要弄两个了

UIButton* titleButton = [UIButton buttonWithType:UIButtonTypeCustom];

        titleButton.frame = CGRectMake(0.0f, 0, 30.0f, 30.0f);

        titleButton.layer.masksToBounds = YES;

        titleButton.layer.cornerRadius = 15.0f;

        titleButton.layer.borderColor = [[UIColor whiteColor] CGColor];

        titleButton.layer.borderWidth = 2.0f;

        [tiView addSubview:titleButton];