简单九宫格 面试被问到让手写 直接跪了

- (void)jiugongge{
    
    NSArray *array =@[[UIColor cyanColor],[UIColor lightGrayColor],
                             [UIColor yellowColor],[UIColor purpleColor],
                             [UIColor blueColor],[UIColor greenColor],
                             [UIColor blackColor],[UIColor magentaColor],
                      [UIColor magentaColor]
                             ];
    for (int i=0; i<9; i++) {
        
       UIView *view = [[UIView alloc]initWithFrame:CGRectMake(i%3*50+100, i/3*50+100, 30, 30)];
       
        view.backgroundColor = array[i];
    
        [self.view addSubview:view];
    }
    
}