iOS 图片加载方法不同内存释放问题

//点击删除查看内存释放问题

• (void)buttonAction:(id)sender {
  // [self.imageView stopAnimating];
  [self.imageView removeFromSuperview];
  self.imageView = nil;
  }

• (void)viewDidLoad {
  [super viewDidLoad];
  // Do any additional setup after loading the view, typically from a nib.

  NSMutableArray *arr = [NSMutableArray array];

  //这种方式加载图片 即使imageView释放 图片缓存仍会存在的 图片
  for (NSInteger i = 1; i <= 63; i++) {
  UIImage *image = [UIImage imageNamed:[NSString stringWithFormat:@"%ld.png", i]];
  [arr addObject:image];
  }

  //这种方式加载图片点击button即可见到内存释放
  for (NSInteger i = 1; i <= 63; i++) {
  NSString *path = [[NSBundle mainBundle] pathForResource:[NSString stringWithFormat:@"%ld", i] ofType:@"png"];
  UIImage *image = [UIImage imageWithContentsOfFile:path];
  [arr addObject:image];
  }

  self.imageView.animationDuration = 2.5f;
  self.imageView.animationImages = arr;
  [self.imageView startAnimating];

}