NGUITools.clipboard cannot work in IOS

[zzzz0000aa]

NGUITools.clipboard can work in PC,but it cannot work in IOS,I guess the Android should be same. I do it, I click and set: NGUITools.clipboard="something", I try paste it ,I get other word(the IOS System copy). what wrong in my steps?

[r.pedra]

According to this post it does not work on iOS:
http://forum.unity3d.com/threads/copy-textfield-or-textarea-text-to-clipboard.24101/

A plugin is available:
https://www.assetstore.unity3d.com/en/#!/content/18863