九宫格计算方式

九宫格计算思路

• 利用控件的索引index计算出控件所在的行号和列号
• 利用列号计算控件的x值
• 利用行号计算控件的y值

- (void)add {
    // 每一个商品的尺寸
    CGFloat shopW = ;
    CGFloat shopH = ;

    // 一行的行数
    int cols = ;

    // 每一列之间的间距
    CGFloat colMargin = (self.shopView.frame.size.width - cols * ) / (cols - );

    // 创建父控件
    UIView *shopView = [[UIView alloc] init];
    shopView.backgroundColor = [UIColor redColor];

    // 商品的索引
    NSUInteger index = self.shopView.subviews.count;

    // 商品的x值
    NSUInteger col = index % cols;
    CGFloat shopX = col * (shopW + colMargin);

    // 商品的y值
    NSUInteger row = index / cols;
    CGFloat shopY = row * (shopH + colMargin);

    shopView.frame = CGRectMake(shopX, shopY, shopW, shopH);

    [self.shopView addSubview:shopView];

    // 添加图片
    UIImageView *icon = [[UIImageView alloc] init];
    icon.image = [UIImage imageNamed:@"danjianbao"];
    icon.frame = CGRectMake(, , shopW, shopW);
    icon.backgroundColor = [UIColor greenColor];

    [shopView addSubview:icon];

    // 添加文字
    UILabel *label = [[UILabel alloc] init];
    label.text = @"单肩包";
    label.frame = CGRectMake(, shopW, shopW, shopH - shopW);
    label.font = [UIFont systemFontOfSize:];
    label.textAlignment = NSTextAlignmentCenter; // 文字居中

    [shopView addSubview:label];

    // 超出部分裁剪
//    self.shopView.clipsToBounds = YES;
}