IOS 九宫格算法

@interface ViewController ()

@property (nonatomic,strong) NSArray *apps; //获取.plist数据
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    //九宫格的总列数
    int totalColumns=5;

    //1.1个格子的尺寸
    CGFloat appW=50;
    CGFloat appH=60;

    //2.计算间隙 ＝（控制器view的宽度 -5*应用宽度）/应用宽度+1
    CGFloat margin=(self.view.frame.size.width-totalColumns*appW)/(totalColumns+1);

    //3.要的应用个数创建对应的格子

    for (int index=0; index<self.apps.count; index++)
    {
        //3.1 创建1个格子
        UIView *appView=[[UIView alloc]init];

        //设置背景色
        appView.backgroundColor=[UIColor redColor];

        //3.2计算行号和列号
        int row =index /totalColumns;
        int col =index % totalColumns;

        CGFloat appX =margin+ col*(appW + margin);
        CGFloat appY =30+ row*(appH + margin);

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

        //3.3添加格子到控制器的View
        [self.view addSubview:appView];

    }

}