跳出双层for循环

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  switch (a)    {        case 1:        {                    }break;                    case 4:        {            for (int i=0;i<2;i++)            {                for (int j=0;j<2;j++)                {                    UILabel *la=[[UILabel alloc]init];                    la.backgroundColor=[UIColor blackColor];                    la.frame=CGRectMake(100+j*35,100+i*35,30,30);                    [self.window addSubview:la];                }            }        }break;        case 2:        case 3:        case 5:        case 6:        case 7:        case 8:        case 9:        {            int x;            for (int i=0;i<3;i++)            {                if (i==x)                {                    break;                }                for (int j=0;j<3;j++)                {                    if (i*3+j==a)                    {                        x=i+1;                        break;                    }                    UILabel *la=[[UILabel alloc]init];                    la.backgroundColor=[UIColor blackColor];                    la.frame=CGRectMake(100+j*35,100+i*35,30,30);                    [self.window addSubview:la];                }            }        }break;        default:            break;    }
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