[question] no such module 'background_locator'

[moovida]

Hi, I am trying to setup the lib to be used in IOS and I am probably doing something wrong.

I followed the wiki page but inside my swift file it can't load the module:

....../ios/Runner/AppDelegate.swift:3:8: error: no such module 'background_locator'
      import background_locator

When I started this, I didn't have a swift file, but Appdelegate.m and .h files and a main.
Any idea what I might be missing. Thanks a ton. Looking forward to test this library.

[mehdok]

You have Objective-C project, There is no need to add AppDelagate.swift. Just add the following line to your AppDelegate.m file:

#import <background_locator/BackgroundLocatorPlugin.h>

[moovida]

The ios part has been generated when I first started the project and I have no knowledge about it. Maybe previous Object-C were generated instead of Swift.

Anyways your suggestion worked: I placed it in the .h just because there I found imports while the .m had includes. But it should be the same I guess.

Thanks a lot!

[moovida]

Please allow me to reopen this, since it looks related.
On IOS the app crashes at startup when trying to connect. In the crash log I find only this which seems to be related:

Thread 0 name:
Thread 0 Crashed:
0   ???                           	000000000000000000 0 + 0
1   Runner                        	0x000000010037e440 -[BackgroundLocatorPlugin handleMethodCall:result:] + 248
2   Flutter                       	0x000000010087ad20 0x1007ec000 + 584992
3   Flutter                       	0x0000000100818338 0x1007ec000 + 181048
4   Flutter                       	0x000000010086bd5c 0x1007ec000 + 523612
5   Flutter                       	0x0000000100826f58 0x1007ec000 + 241496
6   Flutter                       	0x00000001008291dc 0x1007ec000 + 250332
7   CoreFoundation                	0x00000001ba9b61c0 __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ + 28 (CFRunLoop.c:1766)
8   CoreFoundation                	0x00000001ba9b5edc __CFRunLoopDoTimer + 880 (CFRunLoop.c:2357)
9   CoreFoundation                	0x00000001ba9b55b8 __CFRunLoopDoTimers + 276 (CFRunLoop.c:2512)
10  CoreFoundation                	0x00000001ba9b05c8 __CFRunLoopRun + 1640 (CFRunLoop.c:0)
11  CoreFoundation                	0x00000001ba9afc34 CFRunLoopRunSpecific + 424 (CFRunLoop.c:3192)
12  GraphicsServices              	0x00000001c4af938c GSEventRunModal + 160 (GSEvent.c:2246)
13  UIKitCore                     	0x00000001beae222c UIApplicationMain + 1932 (UIApplication.m:4820)
14  Runner                        	0x00000001003753a8 main + 88
15  libdyld.dylib                 	0x00000001ba837800 start + 4

I am quite sure I followed the instructions properly, but clearly something is off. DO you see something that might lead me to the error? Thanks a ton.

[gpibarra]

Are you running the project "example" inside this repository or is it a new application that you copied the configuration?

[moovida]

@gpibarra it is a different application inside which I am trying to use the library.

---

update: I have been able to successfully install the example project and run. The only difference I see is the nature of the ios part (swift vs object-c). I will investigate. Thanks for the hint.

[moovida]

Alright, finally been able to run my app throught Xcode on a device. I am getting this:

.pub-cache/hosted/pub.dartlang.org/background_locator-1.1.2+2/ios/Classes/BackgroundLocatorPlugin.m:169
2020-04-28 09:09:13.539639+0200 Runner[361:15753] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'failed to set registerPlugins'

So I assume I am just doing something wrong in the object-c code. Since I have no idea about what I am doing in there, I will try to post my files, since I feel something is missing:

main.m

#import <Flutter/Flutter.h>
#import <UIKit/UIKit.h>
#import "AppDelegate.h"

int main(int argc, char* argv[]) {
  @autoreleasepool {
    return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
  }
}

AppDelegate.h

#import <Flutter/Flutter.h>
#import <UIKit/UIKit.h>

@interface AppDelegate : FlutterAppDelegate

@end

AppDelegate.m

#include "AppDelegate.h"
#include "GeneratedPluginRegistrant.h"
#import <background_locator/BackgroundLocatorPlugin.h>

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application
    didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
  [GeneratedPluginRegistrant registerWithRegistry:self];
  // Override point for customisation after application launch.
  return [super application:application didFinishLaunchingWithOptions:launchOptions];
}

@end

Shouldn't I be able to call: BackgroundLocatorPlugin.setPluginRegistrantCallback(registerPlugins)
in here somehow?

[moovida]

Alright, I think I found a solution.

I tried to migrate the ios part to swift before but it would not find the background_locator module and therefore not build.

But then I noticed those lines where missing in my Podfile:

target 'Runner' do
  use_frameworks!                                  <-- this one
  use_modular_headers!                         <-- and this one
  # Flutter Pod

  copied_flutter_dir = File.join(__dir__, 'Flutter')

After adding those and running pod install the Pods_Runner.framework is used in the libs section and things are loaded properly.

[moovida]

If it is of interest, I could write a small entry about this migration in the wiki setup part. Maybe another complete ignorant in ios as myself could find benefit.

[mehdok]

If it is of interest, I could write a small entry about this migration in the wiki setup part. Maybe another complete ignorant in ios as myself could find benefit.

You are very welcome to do that;

[moovida]

It is the least I can do :-)

I just noticed that there is no way to make pull requests against the wiki. I therefore attach my proposal of the setup file (zipped sine github doesn't allow md file to be uploaded):Setup.md.zip

For better readability I inverted the steps. It should not be a problem, but you better check if things look right.

Thanks!