Remove black bar from iOS apps

I have a game that uses a scrollview to scroll up and down. On iOS there is a blackbar on the top and bottom of the scrollview. I’m assuming my letterbox needs to be changed, but I’m not sure as to what as no tutorials talk about what to do with a scrollview This is what it looks like.

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Let me ask.  This would not be a letterbox issue.  Letter boxing for a landscape app would be on the sides.

It seems to do it on the kindle fire as well but not on any android devices. I went ahead and removed letterbox and just had it scale without keeping the ratio and it removed the black bar on the top and bottom.

Let me ask.  This would not be a letterbox issue.  Letter boxing for a landscape app would be on the sides.

It seems to do it on the kindle fire as well but not on any android devices. I went ahead and removed letterbox and just had it scale without keeping the ratio and it removed the black bar on the top and bottom.