转自：http://stackoverflow.com/questions/25817562/black-bars-appear-in-app-when-targeting-ios7-1-or-7-0-in-xcode6

I was able to resolve the issue manually, seems like it is a bug with Xcode for now and I will file a radar report.

To resolve the issue, follow the below steps:

1. Navigate to project settings  （Targets-General）
2. Under "App Icons and Launch Images" click on "Use Asset Catalog"
3. Select "Migrate" on the popup that appears.

iOS xcode6.0使用7.1运行程序 iphone5上下有黑条