iOS:制作九宫格

制作简单的九宫格：

源码如下：

 #import "ViewController.h"

 @interface ViewController ()

 @end

 @implementation ViewController

 - (void)viewDidLoad {
     [super viewDidLoad];

     //创建九宫格
     NSInteger col = ;  //每行几列
     NSInteger total = ;//总个数

     //格子的宽度、高度
     UIImage *image = [UIImage imageNamed:@"0.png"];
     CGFloat cellWidth = image.size.width;
     CGFloat cellHeight = image.size.height;

     CGFloat screenWidth = self.view.frame.size.width;

     CGFloat gapX = (screenWidth-cellWidth*col)/(col+);//x方向的间隔
     CGFloat gapY = gapX;//y方向的间隔

     //计算行数
     NSInteger row = ;

     for(int i=; i<total; i++)
     {
         UIButton *button = [[UIButton alloc]init];
         [button setBackgroundImage:[UIImage imageNamed:[NSString stringWithFormat:@"%d.png",i]] forState:UIControlStateNormal];

         //计算是否需要换行
         if(i%col == )
         {
             row++;
         }
         CGFloat x = gapX+(cellWidth+gapX)*(i%col);
         CGFloat y = gapY+(cellHeight+gapY)*row;
         button.frame = CGRectMake(x, y, cellWidth, cellHeight);

         [self.view addSubview:button];
     }
 }

 @end