Troubleshooting linking library in React Native

I wouldn't be posting here if I wasn't having a ton of problems and if I had not spent several days trying to link a library correctly in React Native. Mostly I haven't had issues, but this particular library has seemingly been almost impossible.

https://github.com/jerson/react-native-palette-full

Here's my code, which is very basic:

import Palette from "react-native-palette-full";

    componentDidMount() {
Palette.getAllSwatchesFromUrl(this.state.merchant.coverPhoto);
}

Exactly what you would expect from the instructions on the library.

Instead I am getting this:

I've tried linking it manually:

react-native link react-native-palette-full

I've tried these manual installation instructions:

In XCode, in the project navigator, right click Libraries ➜ Add Files to [your project's name]
Go to node_modules ➜ react-native-palette-full and add RNPalette.xcodeproj
In XCode, in the project navigator, select your project. Add libRNPalette.a to your project's Build Phases ➜ Link Binary With Libraries
Go to Podfile and add "SDWebImage", "~>4.3.3"
Run your project (Cmd+R)<

This just leads to RNPalette not being found, despite the project being right there under my libraries in Xcode.

How can I troubleshoot this and get it working? I'm quite literally tearing my hair out - all I want to do is get a color swatch from an image, and it seems virtually impossible in React Native.

I am on RN .60

EDIT:

I have been trying linking manually, and I am consistently getting the error, no matter what I try, that ImageLoader can't be found:

#import <React/RCTImageLoader.h> 'React/RCTImageLoader.h' file not found

I have also tried adding it as a dependency in the podspec file in the library:

Pod::Spec.new do |s|
  s.name         = "RNPalette"
  s.version      = "1.0.0"
  s.summary      = "RNPalette"
  s.description  = <<-DESC
                 Info about colors from images or url, compatible with **Android** and **iOS**
                   DESC
  s.homepage     = "https://github.com/jerson/react-native-palette-full"
  s.license      = "MIT"
  # s.license      = { :type => "MIT", :file => "FILE_LICENSE" }
  s.author             = { "author" => "jeral17@gmail.com" }
  s.platform     = :ios, "7.0"
  s.source       = { :git => "https://github.com/jerson/react-native-palette-full.git", :tag => "master" }
  s.source_files  = "RNPalette/**/*.{h,m}"
  s.requires_arc = true


  s.dependency "React"
  s.dependency "SDWebImage", "~>4.3.3"
  s.dependency 'React-Core'
  s.dependency 'React-RCTImage'

end

How can I link this library? Is there any way?

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