Output 1 px line in the targeting tab

Question

Hello everybody,

Please help me in solving this problem. I ran into a 1 pixel gap in Tabbar in swift. It has four tabs, and a gap occurs after the third tabbaritem (as you can see in the picture). This is only for iphone 6 plus. It works great on all other devices. I tested, this is not an image problem, because I already deleted all the images from tabbaritems. Your support is very noticeable.

Thanks in advance!