different vertical alignment Font between ios6 and

问题:

I have some problem with the vertical alignment Font between iOS6 and iOS7, I have a custom font that in iOS6 was a bit higher then a centre of vertical alignment in a UIButton, so have I done it? I've set the myButton.titleEdgeInsets = UIEdgeInsetsMake(6, 0, 0, 0) and I've fixed the issue, but now with the iOS7 have the opposite issue now with iOS7 the font is a bit lower...How i can fix this problem for have the same result in both iOS?

Thanks in advance