问题
Steps to reproduce:
- Create a new project using Xcode6 (single view template, iPhone only, Objective-C)
- Navigate to project settings and change the deployment target from 8.0 to 7.1
- Run the application on a iPhone5/S with 7.1 installed or in the iPhone5/s 7.1 simulator (You may have to download the iOS7.1 simulators)
- The app appears with black bars on the top and the bottom.
If you run the application on the iPhone5/S 8.0 simulator, the screen will appear as expected, all white.
Why is this happening? Is there a fix or workaround?
回答1:
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:
- Navigate to project settings
- Under "App Icons and Launch Images" click on "Use Asset Catalog"
- Select "Migrate" on the popup that appears.
This should fix the issue.
回答2:
I encountered the same problem some days ago and I founded out that the problem in my case was the missing LaunchScreen.xib in General setting under App icons and launch images:
回答3:
I had the same issue with Xcode 7 beta 1 and the UICatalog sample code and could resolve it by choosing Main.storyboard in General Settings under App Icons and Launch Images for the Launch Screen File.
回答4:
I've encountered the same issue. It seems that LaunchScreen.xib can't adapt to the screen size of all 4-inch devices under iOS7.
回答5:
On iOS7 (which I was testing on) if I did not add the 640x1136 image in the LaunchImage assets for iPhone Portrait 7.0 Retina I would get the top and bottom bar. Adding the asset in PNG format resolved the issue on iOS7.
来源：https://stackoverflow.com/questions/25817562/black-bars-appear-in-app-when-targeting-ios7-1-or-7-0-in-xcode6