Question: am trying to focus the scroll based on the selected add class,when clicking on the previous and next button the scroll need to focus it. how can i make it possible please check my fiddle 
<https://jsfiddle.net/kannankds/bcszkqLu/>

```
<ul class="kds">
<li>tile dtls1</li>
<li>tile dtls2</li>
<li>tile dtls3</li>
</ul>
<input type="button" value="previous" class="previous">
<input type="button" value="next" class="next">

```

Answer: 
I had fixed this problem.The core of this problem is that we recompile some content in libpng,maybe it exits in other ios framework.Then it makes a conflict.Opncv 3.1 has 3rdparty in it's code.What you should do is find the lines 117-121 in libpng's pngpriv.h.Then just follow [Iphone - device - linker error](https://stackoverflow.com/questions/19089014/iphone-device-linker-error).
I faced the same problem as @shahzaib described. In simulator it works but in iPhone its not working and showing the same error.

Previously I manually added OpenCV 3.1 in my iOS project. Later I changed it and install the OpenCV library via cocoapod <https://cocoapods.org/pods/OpenCV>

And in cocoapod there is 3.1.0.1 version which fixed the issue.

```
  pod 'OpenCV', '~> 3.1.0.1'

```