Objective-c for 循環 九宮格

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {

    [super viewDidLoad];

    

    [self ninePic];

    // Do any additional setup after loading the view, typically from a nib.

}

-(void)ninePic

{

    NSMutableArray *_imageArr = [NSMutableArray arrayWithCapacity:10];

    for (int i = 0; i < 3; i++) {

        for (int j = 0; j < 3; j++) {

            CGRect rect = CGRectMake(18.75+j*118.75, 200+i*118.75, 100, 100);

            UIImageView *imageView = [[UIImageView alloc]initWithFrame:rect];

            imageView.backgroundColor = [UIColor purpleColor];

            [self.view addSubview:imageView];

            [_imageArr addObject:imageView];

        }

    }

    NSLog(@"%@", _imageArr);

    UIImageView *iv = (UIImageView *)_imageArr[4];

    iv.backgroundColor = [UIColor redColor];

}

- (void)didReceiveMemoryWarning {

    [super didReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}

@end