OC 九宫格类的布局

int margin = 10; // 间隙
int width = 50; //控件的宽度
int height = 20; //控件的高度

//布局的初始位置
int  startX = 20;
int  startY = 20;

for (int i = 0; i < 9 ; i++ ) {
    int row = i/3; //行数
    int col = i%3; //列数
    UILabel * label = [[UILabel alloc] initWithFrame:CGRectMake(startX + col * ( width + margin), startY + row * (height + margin), width, height)];
    label.backgroundColor = [UIColor orangeColor];
    [self.view addSubview:label];
}