代码保存

- (CGRect)srandomRect

{

    CGRect rect;

    CGRect rect1 = CGRectMake(60, 80, 80, 40);

    CGRect rect2 = CGRectMake(160, 90, 80, 40);

    CGRect rect3 = CGRectMake(50, 130, 80, 40);

    CGRect rect4 = CGRectMake(200, 150, 80, 40);

    CGRect rect5 = CGRectMake(30, 170, 80, 40);

    CGRect rect6 = CGRectMake(120, 200, 80, 40);

    CGRect rect7 = CGRectMake(40, 230, 80, 40);

    CGRect rect8 = CGRectMake(170, 250, 80, 40);

    CGRect rect9 = CGRectMake(10, 290, 80, 40);

    CGRect rect10 = CGRectMake(100, 290, 80, 40);

    CGRect rect11 = CGRectMake(210, 320, 80, 40);

    CGRect rect12 = CGRectMake(35, 350, 80, 40);

    CGRect rect13 = CGRectMake(135, 380, 80, 40);

    CGRect rect14 = CGRectMake(45, 380, 80, 40);

    CGRect rect15 = CGRectMake(180, 350, 80, 40);

    CGRect rect16 = CGRectMake(55, 3900, 80, 40);

    CGRect rect17 = CGRectMake(210, 70, 80, 40);

    CGRect rect18 = CGRectMake(200, 200, 80, 40);

    rectArr = [NSMutableArray arrayWithObjects:[NSValue valueWithCGRect:rect1],[NSValue valueWithCGRect:rect2],[NSValue valueWithCGRect:rect3],[NSValue valueWithCGRect:rect4],[NSValue valueWithCGRect:rect5],[NSValue valueWithCGRect:rect6],[NSValue valueWithCGRect:rect7],[NSValue valueWithCGRect:rect8],[NSValue valueWithCGRect:rect9],[NSValue valueWithCGRect:rect10],[NSValue valueWithCGRect:rect11],[NSValue valueWithCGRect:rect12],[NSValue valueWithCGRect:rect13],[NSValue valueWithCGRect:rect14],[NSValue valueWithCGRect:rect15],[NSValue valueWithCGRect:rect16],[NSValue valueWithCGRect:rect17],[NSValue valueWithCGRect:rect18], nil];

    int ran = arc4random()%18;

    for (int i= 0; i<18; i++) {

        if (ran == i) {

            rect =  [[rectArr objectAtIndex:i] CGRectValue];

            NSLog(@"srandom rect -------  %d",i);

        }

    }

    return rect;

}