Cheat Sheet

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 about advanced customizations from the User Guide.