scrollview将图像堆叠在彼此的顶部-xcode

我有一个滚动视图，子视图为图像。。当我将图片放在滚动视图的中心时，它们都以堆栈的形式出现在彼此的顶部。。我需要它们水平滚动。。我该如何解决这个问题？这是到目前为止我的代码

- (void)viewDidLoad
{

    [super viewDidLoad];

    for (int i = 1; i < 18; i++) {
        UIImageView *images = [[UIImageView alloc] initWithImage:[UIImage imageNamed: [NSString stringWithFormat:@"%d.jpg", i]]];

       images.frame = CGRectMake((i-1)*320, 0, 320, 330);

        [scroller setContentOffset:CGPointMake(0, 0)];
        [scroller addSubview:images];
        [images setContentMode:UIViewContentModeScaleAspectFill];
        [images sizeToFit];

        //center image
        CGSize boundsSize = scroller.bounds.size;
        CGRect frameToCenter = images.frame;

        // center horizontally
        if (frameToCenter.size.width < boundsSize.width) {
            frameToCenter.origin.x = (boundsSize.width - frameToCenter.size.width) / 2;
            NSLog(@"%f", frameToCenter.origin.x);
        }
        else
            frameToCenter.origin.x = 0;

        // center vertically
        if (frameToCenter.size.height < boundsSize.height)
            frameToCenter.origin.y = (boundsSize.height - frameToCenter.size.height) / 2;
        else
            frameToCenter.origin.y = 0;

        images.frame = frameToCenter;

        scroller.pagingEnabled = NO;


    }


    [scroller setContentMode:UIViewContentModeScaleAspectFit];

    scroller.delegate =self;
    scroller.contentSize = CGSizeMake(320*17, 330);
    scroller.backgroundColor = [UIColor blackColor];
    pageControl.numberOfPages =17;
    pageControl.currentPage = 0;

-（void）viewDidLoad
{
[超级视图下载]；
对于（int i=1；i<18；i++）{
UIImageView*images=[[UIImageView alloc]initWithImage:[UIImageName:[NSString stringWithFormat:@“%d.jpg”，i]]；
images.frame=CGRectMake（（i-1）*320,0320330）；
[scroller setContentOffset:CGPointMake（0,0）]；
[滚动添加子视图：图像]；
[图像设置内容模式：UIViewContentModeScaleAspectFill]；
[图片大小合适]；
//中心图像
CGSize boundsSize=scroller.bounds.size；
CGRect frameToCenter=images.frame；
//水平居中
if（frameToCenter.size.width

要使图像水平居中，只需使用下面的代码即可

float scrollHeight = 0;    
    for (int col = 0; col < index; ++col)
        {
            CGRect selectFrame = CGRectMake(0,0,kOvrW,kOvrH);
            selectionIndicator = [[UIImageView alloc] initWithFrame:selectFrame];
            selectionIndicator.contentMode = UIViewContentModeBottomRight;
            [selectionIndicator setImage:[UIImage imageNamed:@"checked"]];
            CGRect frame = CGRectMake(5,kOvrPreY+col*(kOvrPreH+kOvrH),kOvrW,kOvrH);
            UIView *fr = [[UIView alloc] initWithFrame:frame];

            CGRect imgFrame = CGRectMake(5, 4, 68, 55);
            UIImageView *imgView = [[UIImageView alloc]initWithFrame:imgFrame];
            imgView.image = [UIImage imageNamed:[[subCategories objectAtIndex:col] valueForKey:@"add"]];

            UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(tapAction:)];
            tapGesture.numberOfTapsRequired = 1;
            tapGesture.numberOfTouchesRequired = 1;
            [fr setBackgroundColor:[UIColor colorWithPatternImage:[UIImage imageNamed:@"small-thumb"]]];
            [fr addGestureRecognizer:tapGesture]; 
            [fr addSubview:imgView];
            fr.tag = col;
            [subCatScroll addSubview:fr];

            [subCatScroll bringSubviewToFront:fr];
            scrollHeight += kOvrPreH+kOvrH;
        }
    subCatScroll.contentSize = CGSizeMake(subCatScroll.frame.size.width, scrollHeight+kOvrPreH);

float-scrollHeight=0；
for（int col=0；col

为了吸引更多的答案，你应该添加一个与你所使用的语言或工具相对应的标签。你可以通过在编辑页面底部添加标签来做到这一点。你使用的是什么平台？你是如何将所述子视图居中的？你能显示一些代码吗？