遍历九宫格

int totalColumns = 3; CGFloat top=100;

//       每一格的尺寸
CGFloat cellW = 100;
CGFloat cellH = 100;

//    间隙
CGFloat margin =(self.view.frame.size.width - totalColumns * cellW) / (totalColumns + 1);

//根据格子个数创建对应的框框
for(int index = 0; index< 9; index++) {
    UIView *cellView = [[UIView alloc ]init ];
    cellView.backgroundColor = [UIColor blueColor];
    
    // 计算行号  和   列号
    int row = index / totalColumns;
    int col = index % totalColumns;
    //根据行号和列号来确定 子控件的坐标
    CGFloat cellX = margin + col * (cellW + margin);
    CGFloat cellY = row * (cellH + margin);
    cellView.frame = CGRectMake(cellX, cellY+top, cellW, cellH);
    
    // 添加到view 中  
    [self.view addSubview:cellView];  
}