16.使用iOS自带的库制作属于自己的二维码图片

1.布局界面

2.实现代码

class ViewController: UIViewController {
@IBOutlet var QRImageView: UIImageView!

override func viewDidLoad() { super.viewDidLoad()
QRImageView.image = generateQRImage("哈哈哈哈哈哈", withSizeRate: 10)
}
}

func generateQRImage(stringQR:NSString, withSizeRate rate:CGFloat) -> UIImage {

// 1.初始化我们要生成的二维码类型
let filter:CIFilter = CIFilter(name:"CIQRCodeGenerator")!

// 2.把获取到的字符串转成UTF8编码
let data:NSData = stringQR.dataUsingEncoding(NSUTF8StringEncoding)!

// 3.保存到Defaults中
filter.setDefaults()

// 4.把对应的字符串键值对存储到filter中
filter.setValue(data, forKey: "inputMessage")

let outputImg:CIImage = filter.outputImage
let context:CIContext = CIContext(options: nil)
let cgimg:CGImageRef = context.createCGImage(outputImg, fromRect: outputImg.extent)

var img:UIImage = UIImage(CGImage: cgimg, scale: 1.0, orientation: UIImageOrientation.Up)

let width = img.size.width * rate
let height = img.size.height * rate UIGraphicsBeginImageContext(CGSizeMake(width, height))
let cgContxt:CGContextRef = UIGraphicsGetCurrentContext() CGContextSetInterpolationQuality(cgContxt, kCGInterpolationNone)

img.drawInRect(CGRectMake(0, 0, width, height))
img = UIGraphicsGetImageFromCurrentImageContext() UIGraphicsEndImageContext()

return img
}

3.最终效果