How to add bridging header to Flutter Plugin

Question

I'm trying to create Flutter plugin, which uses Swift and has one pod dependency (NearbyMessages)

First of all, I've added it to .podspec

#
# To learn more about a Podspec see http://guides.cocoapods.org/syntax/podspec.html
#
Pod::Spec.new do |s|
  s.name             = 'flutter_nearby_messages'
  s.version          = '0.0.1'
  s.summary          = 'A new flutter plugin project.'
  s.description      = <<-DESC
A new flutter plugin project.
                       DESC
  s.homepage         = 'http://example.com'
  s.license          = { :file => '../LICENSE' }
  s.author           = { 'Your Company' => 'email@example.com' }
  s.source           = { :path => '.' }
  s.source_files = 'Classes/**/*'
  s.public_header_files = 'Classes/**/*.h'
  s.dependency 'Flutter'
  //************ I've added this lines ***************
  s.dependency 'NearbyMessages' 
  s.xcconfig = { 'SWIFT_OBJC_BRIDGING_HEADER' => 'Classes/bridging_header.h' }
  //********* ^^ I've added this lines ^^ ************
  s.static_framework = true
  s.ios.deployment_target = '8.0'
end

After pod install and initial empty project built, everything seems to be fine

I've tried using it in Objective-C:

#import "FlutterNearbyMessagesPlugin.h"
#import <NearbyMessages/GNSMessages.h>
#import <flutter_nearby_messages/flutter_nearby_messages-Swift.h>

@implementation FlutterNearbyMessagesPlugin
+ (void)registerWithRegistrar:(NSObject<FlutterPluginRegistrar>*)registrar {    
    GNSMessageManager *messageManager =
    [[GNSMessageManager alloc] initWithAPIKey:@"API_KEY"];
  [SwiftFlutterNearbyMessagesPlugin registerWithRegistrar:registrar];
}
@end

And it works, but when I try:

public class SwiftFlutterNearbyMessagesPlugin: NSObject, FlutterPlugin {
    private var client: GNSMessageManager? = nil

XCode says Use of undeclared type GNSMessageManager

I understand, that I need bridging header, and I've already tried to creating it, but it seems not to be linked at all.

Bridging header contains just one line: #import <NearbyMessages/GNSMessages.h>

So my question is, how to add bridging header to flutter plugin?

Can you show the contents of the bridging header file? Have you imported GNSMessageManager in the file? — Durdu, Oct 30 '18 at 07:29
@AndreiDurnea bridging header contains just one line `#import ` — Dmytro Rostopira, Oct 30 '18 at 07:42
No, I do not. I know though, that everyone makes stupid and simple mistakes from time to time - we are only human. And that part was not in your Swift code sample, while it was in your Obj-C code sample. I was just trying to get the obvious out of the way. I'm sorry if it came through as offending. — Losiowaty, Oct 30 '18 at 09:58
I am interesed and knowing how to do this also, you found any solution? — Daniel Oliveira, Jan 24 '19 at 18:40
@DanielOliveira yeah, I've found pretty hacky solution, it works locally but I'm afraid to publish it to pub. Take a look at this repo https://github.com/rostopira/flutter_nearby_messages and this file https://github.com/rostopira/flutter_nearby_messages/blob/master/ios/Classes/NearbyMessages/module.modulemap — Dmytro Rostopira, Jan 25 '19 at 07:43
@DanielOliveira problem is actually in dependency pod, they don't have `.modulemap`. If you can contact developers of required dependency, ask them to add it — Dmytro Rostopira, Jan 25 '19 at 07:44

HemOdd · Accepted Answer · 2020-02-18T09:57:05.493

7

The only solution that worked for me for adding a Bridging Header file to a Flutter plugin was putting the header file in Classes folder and then adding this to .podspec:

s.public_header_files = 'Classes/**/*.h'

edited Feb 18 '20 at 09:57

answered Feb 17 '20 at 12:43

HemOdd

697
1
7
23

How to add bridging header to Flutter Plugin

1 Answers1

Linked