react-native-class-exists
Works currently with:
iOS | Android | Windows |
---|---|---|
Yes | No | No |
Why would I use this?
The situation may arise where you want to incorporate 'new features' that may not run on all your users devices. For instance, a user with iOS 9 will not be able to use SiriKit, whereas a user with iOS 10 will. You can check at run time whether a class exists using this module. You can also use this module to check for device capabilities. For instance, being able to check if a user's device supports ARKit (even if they have iOS 11+, their hardware may not support it).
Getting started
$ npm install react-native-class-exists --save
Mostly automatic installation
$ react-native link react-native-class-exists
Manual installation
iOS
- In XCode, in the project navigator, right click
Libraries
➜Add Files to [your project's name]
- Go to
node_modules
➜react-native-class-exists
and addRNClassExists.xcodeproj
- In XCode, in the project navigator, select your project. Add
libRNClassExists.a
to your project'sBuild Phases
➜Link Binary With Libraries
- Run your project (
Cmd+R
)<
Android
- Open up
android/app/src/main/java/[...]/MainActivity.java
- Add
import com.reactlibrary.RNClassExistsPackage;
to the imports at the top of the file - Add
new RNClassExistsPackage()
to the list returned by thegetPackages()
method
- Append the following lines to
android/settings.gradle
:include ':react-native-class-exists' project(':react-native-class-exists').projectDir = new File(rootProject.projectDir, '../node_modules/react-native-class-exists/android')
- Insert the following lines inside the dependencies block in
android/app/build.gradle
:compile project(':react-native-class-exists')
Static Functions:
function | arguments | notes |
---|---|---|
exists() | className, callback | If you just want to check if a certain class exists at runtime, this is how you do it. |
classMethodResponse() | className, methodName, responseType, callback | Sometimes you want to be able to do more than just check if a class exists at runtime. Sometimes you need to call a class method and get a return value. This is how you do it. As of now, we only wrote the code to allow you to call static class methods with no arguments. Look below for a list of supported return types |
Supported Return Types for classMethodResponse (ObjC types) | Javascript form returned |
---|---|
BOOL | Boolean |
NSNumber | Number |
NSString or String | String |
Remember to include the correct returnType for the method you will be calling
Usage Examples
Checking if UIAlertController works (introduced in iOS 8)
Component { if PlatformOS == 'ios' ClassExists }
Checking if the user can make payments (checking for the class isn't enough. So we can check for the class, AND run a method if it exists, as well as get a return value)
if PlatformOS == 'ios' ClassExists
Checking if the user's device will run ARKit (Augmented Reality Kit from iOS 11+)
if PlatformOS == 'ios' ClassExists