Question

我有图像的滚动视图，但如果我添加许多图像（＆gt; 10），应用程序崩溃（内存限制）。我使用的是iPad 4，不知道为什么会这样。你能帮忙修理一下吗？我的代码是：

- (void)viewDidLoad
{
    [super viewDidLoad];
    //Put the names of our image files in our array.
    imageArray = [[NSArray alloc] initWithObjects:@"salon1.jpg", @"salon2.jpg", @"salon3.jpg", @"salon4.jpg", @"salon5.jpg", @"salon6.jpg", @"salon7.jpg", @"salon8.jpg", @"salon9.jpg", @"salon10.jpg", @"salon11.jpg", @"salon12.jpg", @"salon13.jpg", @"salon14.jpg", @"salon15.jpg", @"salon16.jpg", @"salon17.jpg", @"salon18.jpg", nil];

    for (int i = 0; i < [imageArray count]; i++) {
        //We'll create an imageView object in every 'page' of our scrollView.
        CGRect frame;
        frame.origin.x = self.scrollView.frame.size.width * i;
        frame.origin.y = 0;
        frame.size = self.scrollView.frame.size;

        UIImageView *imageView = [[UIImageView alloc] initWithFrame:frame];
        imageView.image = [UIImage imageNamed:[imageArray objectAtIndex:i]];
        [self.scrollView addSubview:imageView];
    }
    //Set the content size of our scrollview according to the total width of our imageView objects.
    scrollView.contentSize = CGSizeMake(scrollView.frame.size.width * [imageArray count], scrollView.frame.size.height);

}

#pragma mark - UIScrollView Delegate
- (void)scrollViewDidScroll:(UIScrollView *)sender
    {
        // Update the page when more than 50% of the previous/next page is visible
        CGFloat pageWidth = self.scrollView.frame.size.width;
        int page = floor((self.scrollView.contentOffset.x - pageWidth / 2) / pageWidth) + 1;
        self.pageControl.currentPage = page;
    }

    @synthesize scrollView;
    @synthesize pageControl;
    @synthesize imageArray;

Answer 1

您的应用崩溃，因为每台设备的内存量都有限。问题是您尝试一次加载所有图像。相反，尝试UICollectionView或UITableView - 它们将为当前可见的单元格分配内存并重用其他单元格。

iPad上的UIScrollView崩溃应用程序

1 个答案: