How to Create Bridge in React Native for iOS and Android?

Main thread: where UIKit work
Shadow queue: where the layout happens
JavaScript thread: where your JS code is really running
Every native module has its own GCD Queue except it determines otherwise. Now since this Native module will run on a
special thread and our main thread depends thereon , it's showing this warning. And to form this code to run on
MainQueue, open Bulb.swift and add this function.
@objc
static func requiresMainQueueSetup() -> Bool {
return true
}
You can explicitly mention return false to run this during a separate threat.
Step 3 - Accessing a variable in JavaScript from Swift and Callbacks
add the Bulb Status(ON or OFF) value to our React screen. to try to do so we'll add the getStatus function to Bulb.swift
and call that method from JavaScript code. we'll create this method as a callback.
Let's update the code in bold in Bulb.swift
Import Foundation
@oblc(Bulb)
Class Bulb :NSObject {
@objc
Static var isOn = false
@objc
Func turnOn () {
Bulb.isOn= true
Print (“Bulb is now ON”)
}
@objc
Func turnOFF(){
Bulb.isOn = false
Print (“”print Bulb is now OFF”)
}