我有这样的代码为滚动视图,以简易淋浴3个图像:IOS:UIScrollView中具有无限页面视图
const CGFloat kScrollObjHeight = 150.0;
const CGFloat kScrollObjWidth = 320.0;
const NSUInteger kNumImages = 3;
- (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)];
}
- (void)viewDidLoad
{
self.view.backgroundColor = [UIColor viewFlipsideBackgroundColor];
// 1. setup the scrollview for multiple images and add it to the view controller
//
// note: the following can be done in Interface Builder, but we show this in code for clarity
[scrollView1 setBackgroundColor:[UIColor blackColor]];
[scrollView1 setCanCancelContentTouches:NO];
scrollView1.indicatorStyle = UIScrollViewIndicatorStyleWhite;
scrollView1.clipsToBounds = YES; // default is NO, we want to restrict drawing within our scrollview
scrollView1.scrollEnabled = YES;
// pagingEnabled property default is NO, if set the scroller will stop or snap at each photo
// if you want free-flowing scroll, don't set this property.
scrollView1.pagingEnabled = YES;
scrollView2.pagingEnabled = YES;
scrollView3.pagingEnabled = YES;
// load all the images from our bundle and add them to the scroll view
NSUInteger i;
for (i = 1; i <= kNumImages; i++)
{
NSString *imageName = [NSString stringWithFormat:@"image%d.jpg", i];
UIImage *image = [UIImage imageNamed:imageName];
UIImageView *imageView = [[UIImageView alloc] initWithImage:image];
// setup each frame to a default height and width, it will be properly placed when we call "updateScrollList"
CGRect rect = imageView.frame;
rect.size.height = kScrollObjHeight;
rect.size.width = kScrollObjWidth;
imageView.frame = rect;
imageView.tag = i; // tag our images for later use when we place them in serial fashion
[scrollView1 addSubview:imageView];
//[scrollView2 addSubview:imageView];
//[scrollView3 addSubview:imageView];
[imageView release];
}
[self layoutScrollImages]; // now place the photos in serial layout within the scrollview
}
但现在我想做一个滚动型是在最后的图像时,给我的第一图像后滚动视图和同样的事情,当我有第一个图像,如果我回去,它必须显示最后一个图像;所以我想创建一个寻呼循环。
你好,谢谢你的回答。我希望你能提供更多的细节。我应该听什么委托方法来决定何时更改图像的顺序并更改内容偏移量?参考您提供的第一个解决方案。 – jmurphy
scrollviewDidScroll:是最合适的 - 每当用户更改contentOffset时它都会给你留言。 – Tommy
谢谢。我现在正在侦听scrollViewDidScroll并将我的contentSize设置为3 * sizeOfContent。当用户滚动时,我检查内容偏移量是0还是640(我的内容是320)。如果0用户向左滚动,则重新排序contentArray一个位置并将setContentOffset设置为320.如果偏移量为640,则反向。我还设置了bounce = NO,因此这些偏移量只能在每次滑动时命中一次。这听起来像是一种合理的方法,基本上是你想到的吗? – jmurphy