这里是一个需要显示在横向和纵向MDOE中心显示按钮约束的屏幕

Here is a screen which show constraint needed to show button in centre in both landscape and portrait mdoe

这是我曾经张贴在计算器结果一个最简单的事情
请再次检查您的code和看有没有其他的限制你必须适用。结果

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注意：在iOS8上的状态栏隐藏在横向模式下，如果你想在横向模式下显示它请按照我的答案在这里link.

This is a simplest thing i ever post in ***
Please check your code again and see is there any other constrains you had apply.

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Note : In iOS8 status bar is hide in landscape mode and if you want to display it in landscape mode please follow my answer over here link.