iphone 应用程序滚动视图是水平的，但我希望它是垂直的 - 我该如何更改？

Question

从苹果开发者网站获得了这个viewscroller 的代码。

@synthesize scrollView1, scrollView2;

const CGFloat kScrollObjHeight  = 467.0;
const CGFloat kScrollObjWidth   = 320.0;
const NSUInteger kNumImages     = 6;


- (void)layoutScrollImages
{
    UIImageView *view = nil;
    NSArray *subviews = [scrollView1 subviews];


    // reposition all image subviews in a horizontal serial fashion
    CGFloat curXLoc = 0;
    for (view in subviews)
    {
        if ([view isKindOfClass:[UIImageView class]] && view.tag > 0)
        {
            CGRect frame = view.frame;
            frame.origin = CGPointMake(curXLoc, 0);
            view.frame = frame;

            curXLoc += (kScrollObjWidth);
        }
    }

    // set the content size so it can be scrollable
    [scrollView1 setContentSize:CGSizeMake((kNumImages * kScrollObjWidth), [scrollView1 bounds].size.height)];
}

它可以通过向左或向右拉动图像来旋转图像，效果非常好。但我想上下拉动图像以更改它们。

谁能帮我解决这个问题？代码中的这部分看起来好像控制方向，但我不确定如何更改它。

// reposition all image subviews in a horizontal serial fashion
    CGFloat curXLoc = 0;
    for (view in subviews)
    {
        if ([view isKindOfClass:[UIImageView class]] && view.tag > 0)
        {
            CGRect frame = view.frame;
            frame.origin = CGPointMake(curXLoc, 0);
            view.frame = frame;

            curXLoc += (kScrollObjWidth);
        }
    }

非常感谢任何帮助，谢谢！

比利

Answer 1

要将滚动“方向”从水平更改为垂直，您基本上应该交换处理 x 和 y 坐标的方式。代码如下所示：

- (void)layoutScrollImages
{
    UIImageView *view = nil;
    NSArray *subviews = [scrollView1 subviews];

   // reposition all image subviews in a horizontal serial fashion
    CGFloat curYLoc = 0;
    for (view in subviews)
    {
        if ([view isKindOfClass:[UIImageView class]] && view.tag > 0)
        {
            CGRect frame = view.frame;
            frame.origin = CGPointMake(0, curYLoc);
            view.frame = frame;

            curYLoc += (kScrollObjHeight);
        }
    }

    // set the content size so it can be scrollable
    [scrollView1 setContentSize:CGSizeMake([scrollView1 bounds].size.width, kNumImages * kScrollObjHeight)];
}