iOS simulator does not display TextFields correctly

Question

I was designing a login screen for an app. The screen itself is pretty simple. In the Storyboard editor I see:

When I run it on a simulator (iPhone 6s Plus), however, things do not seem right. The textfields do not appear:

If I click into the area where the textfield is supposed to be, I can see it is really there:

I think the issue might end up being just the display, but I want to make sure. Has anyone else had this happen? What was the reason for this issue?

Answer 1

You have set the UITextBorderStyle of your text fields to None. That means they have no visible border. If that isn't what you want, pick a different border style.

Answer 2

显然，边界在那里，显示质量太低，以至于我看不到它：/