Is this a bug report?

Yes

Have you read the Contributing Guidelines?

Yes

Environment

Environment:
OS: macOS Sierra 10.12.6
Node: 6.11.3
Yarn: 1.1.0
npm: 5.3.0
Watchman: 4.9.0
Xcode: Xcode 9.0 Build version 9A235
Android Studio: 2.3 AI-162.4069837

Packages: (wanted => installed)
react: 16.0.0-beta.5 => 16.0.0-beta.5
react-native: 0.49.1 => 0.49.1

Steps to Reproduce

(Write your steps here:)

1.Access the application
2. Going to splash screen
3. Go to other menu via react-navigation (Using TabNavigator and StackNavigator).

Expected Behavior

The menu and content of the apps accessed normally in IOS devices.

(Write what you thought would happen.)

Actual Behavior

The screens become blur like the content is not loaded properly.

(Write what happened. Add screenshots!)

Hi, i am new in react native. This only happens in ios application (never happen in android). All screens and contents of apps become strange, but is is intermittent some times is become normally again after access the other screen and sometimes become crash again. Please Help. It is the problem with my codes or there is something wrong? Thank you.

Reproducible Demo

(Paste the link to an example project and exact instructions to reproduce the issue.)