1. Include the font in your Xcode project.
2. Make sure that they are included in the Target Membership column
Click on the font from the navigator, and check if the font included.
3. Check if the font included as Resource in your bundle
click on your Xcode project file, select "Build Phases, select "Copy Bundle Resources". Check if your font is added.
4. Include the font in Application Plist (Info.plist)
from the application main folder open Info.plist, click on "Information Property List", and then click the plus sign (+). from drop down list choose "Fonts provided by application".
5. Add Font name in Fonts provided by application
expand Fonts Provided by Application and add the Font Name exactly to value column
Use it in the Application
<Text style={{fontFamily:'IndieFlower'}}>
Welcome to React Native!
</Text>