但是当我添加第二个UIImageView时,我所拥有的图像位置已经获得了新值,并且新图像不会显示.

这是viewdidload中第一个图像的代码(工作正常)：

// load all the images from our bundle and add them to the scroll view
for (i = 1; i <= kNumImages; i++)
{
    NSString *imageName = [NSString stringWithFormat:@"image%d.jpg",i];
    UIImage *image2 = [UIImage imageNamed:imageName];
    UIImageView *imageView2 = [[UIImageView alloc] initWithImage:image2];


    // setup each frame to a default height and width,it will be properly placed when we call "updateScrollList"
    CGRect rect = imageView2.frame;
    rect.size.height = imageviewScrollObjHeight;
    rect.size.width = imageviewScrollObjWidth;

    // Get the Layer of any view
    CALayer * imageLayer = [imageView2 layer];
    [imageLayer setMasksToBounds:YES];
    [imageLayer setCornerRadius:7.0];

    // You can even add a border
    [imageLayer setBorderWidth:1.0];
    [imageLayer setBorderColor:[[UIColor lightGrayColor] CGColor]];

    imageView2.frame = rect;
    imageView2.tag = i; // tag our images for later use when we place them in serial fashion  


    [scrollView1 addSubview:imageView2];

}

[self layoutScrollImages];  // now place the photos in serial layout within the scrollview

这是在每个页面上布局第一个图像的代码,每页不同的图像(在viewdidload之外)(工作正常)：

// layout images for imageview1
- (void)layoutScrollImages
{
UIImageView *imageView = nil;
NSArray *subviews = [scrollView1 subviews];

// reposition all image subviews in a horizontal serial fashion
CGFloat curXLoc = 10;
for (imageView in subviews)
{
    if ([imageView isKindOfClass:[UIImageView class]] && imageView.tag > 0)
    {
        CGRect frame = imageView.frame;
        frame.origin = CGPointMake(curXLoc,50);
        imageView.frame = frame;

        curXLoc += (kScrollObjWidth);
    }
}

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

这是第二个图像的代码(在viewdidload内部):(当我删除[self layoutNavScrollImages];图像只在第一页上加载)

for (i = 1; i <= kNumImages; i++)
{

    UIImage *navBarImage = [UIImage imageNamed:@"navigationbar.png"];
    UIImageView *imageViewNavBar = [[UIImageView alloc] initWithImage:navBarImage];

    // setup each frame to a default height and width,it will be properly placed when we call "updateScrollList"
    CGRect navBarRect = imageViewNavBar.frame;
    navBarRect.size.height = 44;
    navBarRect.size.width = 320;
    navBarRect.origin.x = 0;
    navBarRect.origin.y = 0;

    /* Get the Layer of any view
     CALayer * imageLayer = [imageView3 layer];
     [imageLayer setMasksToBounds:YES];
     [imageLayer setCornerRadius:7.0];

     // You can even add a border
     [imageLayer setBorderWidth:1.0];
     [imageLayer setBorderColor:[[UIColor lightGrayColor] CGColor]];
     */
    imageViewNavBar.frame = navBarRect;
    imageViewNavBar.tag = i;    // tag our images for later use when we place them in serial fashion  

    [scrollView1 addSubview:imageViewNavBar];

}

[self layoutNavScrollImages];

和viewdidload外的代码:(这会覆盖第一个图像的位置)

- (void)layoutNavScrollImages
{
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)];
}