ios九宫格算法

- (void)viewDidLoad {

    [super viewDidLoad];

    //1.总列数(一行最多3列)

    int totalColumns=;

    CGFloat appW=;

    CGFloat appH=;

    //2.间隙=(控制器的view的宽度-3*应用宽度)/4

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

    //3.根据应用个数创建对应的框

    for (int index=; index<self.apps.count; index++) {

        //NSDictionary *dict=self.apps[index];//字典

        //appModel *model=self.apps[index];//模型

        //创建一个view

        UIView *appView=[[UIView alloc] init];

        //设置背景色

        appView.backgroundColor=[UIColor redColor];

        //计算出行号和列号

        int row=index/totalColumns;

        int col=index%totalColumns;

        //每个格的坐标

        CGFloat appX=margin+col * (appW+margin);

        CGFloat appY=+row*(appH + margin);

        appView.frame=CGRectMake(appX, appY, appW, appH);

        [self.view addSubview:appView];

    }

}