如图 ，创建九宫格

示例图片

NSInteger row = 3; // 三列
    NSInteger line = 3; // 三行
    CGFloat buttonW = (SCREEN_WIDTH-40)/line;
    CGFloat buttonH = buttonW;
    CGFloat margin = 10;
    for (int i = 0; i < 6; i++) {
        UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
        button.frame = CGRectMake(margin+i%row*(buttonW+margin), 200+i/line*(buttonH+margin), buttonW, buttonH);
        button.backgroundColor = [UIColor redColor];
        [button addTarget:self action:@selector(buttonClick:) forControlEvents:UIControlEventTouchUpInside];
        button.tag = i;
        [self.view addSubview:button];
    }