for循环创建UIButton，如何去修改边框颜色

看一下效果图，类似于淘宝加入购物车，我用的是UIButton



颜色颜色Button和型号一样：

1.创建UIButton

for (int i = 0; i < 6; i++) {

        self.selectColorBtn = [UIButton buttonWithType:UIButtonTypeCustom];

        if (i > 4) {

        self.selectColorBtn.frame = CGRectMake(70 * widthScale + 60 * widthScale * (i-5)  , 50 * widthScale, 50 * widthScale, 30 *widthScale);

        }else{

        self.selectColorBtn.frame = CGRectMake(70 * widthScale + 60 * widthScale * i  , 10 * widthScale, 50 * widthScale, 30 *widthScale);

        }

        [self.selectColorBtn setTitle:@"暗灰色" forState:UIControlStateNormal];

        [self.selectColorBtn setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];

        self.selectColorBtn.tag = 100 + i;

        self.selectColorBtn.titleLabel.font = [UIFont systemFontOfSize:15 * widthScale];

        [self.selectColorBtn.layer setBorderWidth:1.0];

        [self.selectColorBtn.layer setBorderColor:[gray CGColor]];

        [self.selectColorBtn addTarget:self action:@selector(selectColorAction:) forControlEvents:UIControlEventTouchUpInside];

        

        [self.twoView addSubview:self.selectColorBtn];

        

        

    }

2.按钮点击事件

- (void)selectColorAction:(UIButton *)btn{

//将Button颜色全部修改为灰色

    for (int i = 0; i < 6; i++) {

//通过tag值获取UIbutton

        UIButton *btn = (UIButton *)[self.twoView viewWithTag:100 + i];

        [btn.layer setBorderColor:[gray CGColor]];

    }

//获取当前UIButton

    UIButton *nowBtn = btn;

    switch (btn.tag) {

        case 100:

         

        [nowBtn.layer setBorderColor:[ThemeColors CGColor]];

            break;

        case 101:

            [nowBtn.layer setBorderColor:[ThemeColors CGColor]];

            break;

        case 102:

           

            [nowBtn.layer setBorderColor:[ThemeColors CGColor]];

            break;

        case 103:

            [nowBtn.layer setBorderColor:[ThemeColors CGColor]];

            break;

        case 104:

            [nowBtn.layer setBorderColor:[ThemeColors CGColor]];

            break;

        case 105:

            [nowBtn.layer setBorderColor:[ThemeColors CGColor]];

            break;

        default:

            break;

    }