Linker command failed with exit code 1 (React native - ios)

Question

I'm following along with the iOS MapView example.

I created a new Objective-C .m file in Project/ProjectFolder/RCTMapManager.m, and added the following code:

// RCTMapManager.m
#import <MapKit/MapKit.h>

#import "RCTViewManager.h"

@interface RCTMapManager : RCTViewManager
@end

@implementation RCTMapManager

RCT_EXPORT_MODULE()

- (UIView *)view
{
  return [[MKMapView alloc] init];
}

@end

I then opened up atom and created a js file in components/MapView.js and added the following code:

// MapView.js

import { requireNativeComponent } from 'react-native';

// requireNativeComponent automatically resolves this to "RCTMapManager"
module.exports = requireNativeComponent('RCTMap', null);

And ran the build command in Xcode to rebuild my previously working project, and the build failed with the error message:

So I then commented out everything in MapView.js, and commented out the implementation in RCTMapManager.m.

This will build:

// RCTMapManager.m
#import <MapKit/MapKit.h>

#import "RCTViewManager.h"

@interface RCTMapManager : RCTViewManager
@end

But as soon as I add the implementation, it fails with "Linker command failed with exit code 1":

// RCTMapManager.m
#import <MapKit/MapKit.h>

#import "RCTViewManager.h"

@interface RCTMapManager : RCTViewManager
@end

@implementation RCTMapManager

RCT_EXPORT_MODULE()

- (UIView *)view
{
  return [[MKMapView alloc] init];
}

@end

I wondering why the implementation is causing this to fail, and how to fix it?

Daniel Basedow · Accepted Answer · 2016-06-12 17:30:09Z

1

RCTMapManager is already defined in react-native. I guess the example in the docs has been written before it was added to the library.

If you just want to use maps, have a look at MapView.

However if you want to experiment with custom native components, change the class names you use. In Objective-C class names are traditionally prefixed with three letters that describe your company or project (this is where the RCT comes from).

answered Jun 12, 2016 at 17:30

Daniel Basedow

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