blocks|key|552380|text|如果您正在讨论导航上要显示的下一个图像。然后在这里检查示例代码|type|unstyled|depth|inlineStyleRanges|entityRanges|data|552381|http://developer.apple.com/library/ios/#samplecode/PageControl/Introduction/Intro.html|offset|length|552382|如果还有什么事的话。然后解释一下|552383|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|2E|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@$D|Q|E|R|1|S]]|A|$]]|$1|F|3|G|5|6|7|T|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|U|8|@]|9|@]|A|$]]]|I|$J|$5|K|L|M|A|$N|C]]]]

if you are talking about on navigation next image to be displayed. then check sample code here

<a href="http://developer.apple.com/library/ios/#samplecode/PageControl/Introduction/Intro.html" rel="nofollow">http://developer.apple.com/library/ios/#samplecode/PageControl/Introduction/Intro.html</a>

and if any thing else. then explain what

blocks|key|2347426|text|检查图像的x坐标如何？这似乎是一种检查显示的图片的合法方式...如果需要标记，可以使用索引，或者将指向图像的指针存储在字典中。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2347427|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

How about checking the x-coordinate of the images ? That seems to be a legit way to check what picture is showing... If you want tag, you can either use the indexes, or store the pointers to the images in a dictionary.

blocks|key|552465|text|您可以使用以下公式简单地计算UIScrollView的偏移量：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|552466|NSUInteger+currentPage+=+floor((yourScrollView.contentOffset.y+-+theHeightOfYourImage/2)+/+theHeightOfYourImage)%2B1|code-block|syntax|javascript|552467|这是从我的头顶，但如果我没有错，这将给你的当前页面是在选择的时刻。当然，这需要你所有的页面/图片都有相同的高度。|552468|您可以在以下代码中实现此功能|552469|-+(void)+scrollViewDidScroll:(UIScrollView+*)scrollView|552470|这将为您提供一个可以使用的索引。|552471|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|T|8|@]|9|@]|A|$]]|$1|K|3|L|5|D|7|U|8|@]|9|@]|A|$E|F]]|$1|M|3|N|5|6|7|V|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

You can simply calculate the offset of your UIScrollView, by using the following formula:

<pre><code>NSUInteger currentPage = floor((yourScrollView.contentOffset.y - theHeightOfYourImage/2) / theHeightOfYourImage)+1
</code></pre>

This is from the top of my head, but if I'm not wrong this will give you the current page that's at the moment selected. Of course this needs all your pages/images to have the same height.

You could implement this in

<pre><code>- (void) scrollViewDidScroll:(UIScrollView *)scrollView
</code></pre>

This would then give you an index to work with.

blocks|key|1329565|text|我根据我从其他答案的评论中得到的答案来回答(你真的应该修改你的问题！)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1329566|我假设有一个处于分页模式的UIScrollView，它在滚动停止后的整个画面上只显示一个图像。如果您只对获取此图像感兴趣并执行某些操作，假设依赖于您之前设置的标记，则滚动视图的委托中的代码可能如下所示：|1329567|-+(void)scrollViewDidEndDecelerating:(UIScrollView+*)scrollView
{
++int+imageTag;
++for(UIView+*sv+in+scrollView.subviews)+
++{
++++if(sv.frame.origin.y+>=+scrollView.contentOffset.y+
+++++++&&+sv.frame.origin.y+<=+scrollView.contentOffset.y+%2B+scrollView.frame.size.height)+
++++{
++++++imageTag+=+sv.tag;
++++++break;
++++}
++}
++switch+(imageTag)+
++{
++++++//do+something
++}
}|code-block|syntax|javascript|1329568|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

I answer on basis what I got from the comments on other answers (You really should edit your question!!!).

I assume that there is a UIScrollView in paging mode which shows exactly one image on his full frame after scrolling has stopped. If you only interested in getting this image and do something, let's say dependent on a tag you set before, the code in your scroll view's delegate could look like that:

<pre><code>- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
{
 int imageTag;
 for(UIView *sv in scrollView.subviews) 
 {
 if(sv.frame.origin.y &gt;= scrollView.contentOffset.y 
 &amp;&amp; sv.frame.origin.y &lt;= scrollView.contentOffset.y + scrollView.frame.size.height) 
 {
 imageTag = sv.tag;
 break;
 }
 }
 switch (imageTag) 
 {
 //do something
 }
}
</code></pre>

How to assign them to have tag:

<pre><code>self.images = [NSMutableArray arrayWithObjects:
 @"1.jpg",@"2.jpg",@"3.jpg",@"4.jpg",@"5.jpg",nil];
</code></pre>

Whenever UIScrollView stops at a specific image it will do something/action/animation. Like for example drawing a box at the left when image 1 is displayed, drawing a box at the right when image 2 is displayed in a UIScrollView. Thanks.

here is the array :

<pre><code>- (void)awakeFromNib
{ 
 if (self) {

 //set up carousel data
 //wrap YES = infinite loop
 wrap = YES;

 self.images = [NSMutableArray arrayWithObjects:
 @"1.jpg",@"2.jpg",@"3.jpg",@"4.jpg",@"5.jpg"nil];
 }

}
</code></pre>

here is where my image is shown:

<pre><code>- (UIView *)carousel:(iCarousel *)_carousel viewForItemAtIndex:(NSUInteger)index reusingView:(UIView *)view
{
 view = [[UIImageView alloc] initWithImage:[UIImage imageNamed:[images objectAtIndex:index]]];

 return view;

}
</code></pre>

How to tag UIImage in UIScrollView

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

文章

问答

视频

学习中心

腾讯云实验室

直播

竞赛

腾讯云代码分析专区

腾讯iOA零信任安全管理系统专区

腾讯云架构师技术同盟交流圈

腾讯云数据库专区

腾讯云顾问专区

腾讯云原生专区

腾讯混元专区

腾讯云TCE专区

腾讯云Lighthouse专区

腾讯云HAI专区

腾讯云Edgeone专区

腾讯云存储专区

腾讯云智能专区

腾讯轻联专区 

腾讯云开发专区

TAPD专区

腾讯轻量云游戏服专区

腾讯云最具价值专家

腾讯云架构师技术同盟

腾讯云创作之星

腾讯云开发者先锋

腾讯云代码助手

云原生构建

TAPD 敏捷项目管理

Cloud Studio

SDK中心

API中心

命令行工具

涵盖代码开发、场景应用、自动测试全流程，助你从零构建专属AI助手

一站式MCP教程库，解锁AI应用新玩法

如何将它们指定为具有标签：self.images = [NSMutableArray arrayWithObjects:                       @"1.jpg",@"2.jpg",@"3.jpg",@"4.jpg",@"5.jpg",nil];每当UIScrollView停在一个特定的图像时，它就...

问如何在UIScrollView中标记UIImage
EN

Stack Overflow用户

社区

活动

圈层

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问如何在UIScrollView中标记UIImageEN