A better way to operate QR Code in Swift

by iOS Example

EFQRCode is a lightweight, pure-Swift library for generating stylized QRCode images with watermark or icon, and for recognizing QRCode from images, inspired by qrcode. Based on CoreGraphics, CoreImage, and ImageIO, EFQRCode provides you a better way to handle QRCode in your app, no matter if it is on iOS, macOS, watchOS, and/or tvOS. You can integrate EFQRCode through CocoaPods, Carthage, and/or Swift Package Manager.

Examples

Demo Projects

TestFlight

You can click the TestFlight button below to download demo with TestFlight:

App Store

You can click the App Store button below to download demo, support iOS, tvOS and watchOS:

You can also click the Mac App Store button below to download demo for macOS:

Compile Demo Manually

To run the example project manually, clone the repo, demos are in the 'Examples' folder, remember run command sh Startup.sh in terminal to get all dependencies first, then open EFQRCode.xcworkspace with Xcode and select the target you want, run.

Or you can run the following command in terminal:

git clone git@github.com:EFPrefix/EFQRCode.git; cd EFQRCode; sh Startup.sh; open 'EFQRCode.xcworkspace'

Requirements

Version Needs
1.x Xcode 8.0+
Swift 3.0+
iOS 8.0+ / macOS 10.11+ / tvOS 9.0+
4.x Xcode 9.0+
Swift 4.0+
iOS 8.0+ / macOS 10.11+ / tvOS 9.0+ / watchOS 2.0+
5.x Xcode 11.1+
Swift 5.0+
iOS 8.0+ / macOS 10.11+ / tvOS 9.0+ / watchOS 2.0+
6.x Xcode 12.0+
Swift 5.1+
iOS 9.0+ / macOS 10.10+ / tvOS 9.0+ / watchOS 2.0+

Installation

CocoaPods

EFQRCode is available through CocoaPods. To install
it, simply add the following line to your Podfile:

pod 'EFQRCode', '~> 6.1.0'

Then, run the following command:

$ pod install

Carthage

IMPORTANT: this workaround is necessary for Carthage to somewhat work in Xcode 12.

Carthage is a decentralized dependency manager that builds your dependencies and provides you with binary frameworks.

You can install Carthage with Homebrew using the following command:

$ brew update
$ brew install carthage

To integrate EFQRCode into your Xcode project using Carthage, specify it in your Cartfile:

github "EFPrefix/EFQRCode" ~> 6.1.0

Run carthage update to build the framework and drag the built EFQRCode.framework into your Xcode project.

Swift Package Manager

The Swift Package Manager is a tool for automating the distribution of Swift code and is integrated into the Swift compiler.

Once you have your Swift package set up, adding EFQRCode as a dependency is as easy as adding it to the dependencies value of your Package.swift.

dependencies: [
    .package(url: "https://github.com/EFPrefix/EFQRCode.git", .upToNextMinor(from: "6.1.0"))
]

Quick Start

1. Import EFQRCode

Import EFQRCode module where you want to use it:

import EFQRCode

2. Recognition

A String Array is returned as there might be several QR Codes in a single CGImage:

if let testImage = UIImage(named: "test.png")?.cgImage {
    let codes = EFQRCode.recognize(testImage)
    if !codes.isEmpty {
        print("There are \(codes.count) codes")
        for (index, code) in codes.enumerated() {
            print("The content of QR Code \(index) is \(code).")
        }
    } else {
        print("There is no QR Codes in testImage.")
    }
}

3. Generation

Create QR Code image, basic usage:

Parameter Description
content REQUIRED, content of QR Code
size Width and height of image
backgroundColor Background color of QRCode
foregroundColor Foreground color of QRCode
watermark Background image of QRCode 
if let image = EFQRCode.generate(
    for: "https://github.com/EFPrefix/EFQRCode",
    watermark: UIImage(named: "WWF")?.cgImage
) {
    print("Create QRCode image success \(image)")
} else {
    print("Create QRCode image failed!")
}

Result:

4. Generation from GIF

Use EFQRCode.generateGIF to create GIF QRCode.

Parameter Description
generator REQUIRED, an EFQRCodeGenerator instance with other settings
data REQUIRED, encoded input GIF
delay Output QRCode GIF delay, emitted means no change
loopCount Times looped in GIF, emitted means no change 
if let qrCodeData = EFQRCode.generateGIF(
    using: generator, withWatermarkGIF: data
) {
    print("Create QRCode image success.")
} else {
    print("Create QRCode image failed!")
}

You can get more information from the demo, result will like this:

5. Next

Learn more from User Guide.

Recommendations

  1. Please select a high contrast foreground and background color combinations;
  2. To improve the definition of QRCode images, increase size, or scale up using magnification (instead);
  3. Magnification too high／size too large／contents too long may cause failure;
  4. It is recommended to test the QRCode image before put it into use;
  5. You can contact me if there is any problem, both Issue and Pull request are welcome.

PS of PS: I wish you can click the Star button if this tool is useful for you, thanks, QAQ...

GitHub

https://github.com/EFPrefix/EFQRCode