The upper and lower black edges of the simulator or phone's real screen

Recently, when I was doing a project, I ran into a pit problem.

We create a project to look at

When you are constrained or unconstrained, the top and bottom are 00 coordinates, no matter 4, 5, 6, 6+ are all right.

There's a problem with the project is this

There's a black side up and down, so let's see where the problem is.

We have no problem with the project open

There is a problem with the following

All right, let's start looking for something different.

Compare to know launch screen file here, no problem of the project this file is Launchscreen this folder, and the problem is not something, we put this folder, and then run the project found OK no problem,

You may say, I have not deleted this place ah, how could not have, but actually is like this

When writing the project, accidentally deleted launchscreen this folder, and then put this folder, Pilst file here is not good to join, so also need to manually add

There is another possibility that

is the use as Launch screen selected?

Links: http://www.jianshu.com/p/12097518c52d

The upper and lower black edges of the simulator or phone's real screen