Applications using Launch Screen Files and targetting iOS 7.1 and earlier need to also include a Launch Image in an Asset Catalog.

在使用xcode6建的项目时，有时在ios7模拟器下会出现一下情况

 

导航栏上方和tabbar下方会有黑边

并且会有一下警告：

 

Applications using Launch Screen Files and targetting iOS 7.1 and earlier need to also include a Launch Image in an Asset Catalog.

 

解决方案：

1、选择launch images  use asset catalog

2、点击migrate

 

 

3、完美解决问题，没有警告。