[swift学习之十二]二维码创建练习

谁践踏了优雅 2022-08-22 05:49 218阅读 0赞

import UIKit
    
    extension CGFloat{
        func ToInt() -> Int {
            return Int(self)
        }
    }
    
    extension CIImage{
        func ToUiImag(ASize: CGFloat) -> UIImage {
            let extent = CGRectIntegral(self.extent)
            let scale = min(ASize/CGRectGetWidth(extent), ASize/CGRectGetHeight(extent))
            let W = (CGRectGetWidth(extent) * scale).ToInt()
            let H = (CGRectGetHeight(extent) * scale).ToInt()
            let cs = CGColorSpaceCreateDeviceGray()
            let bitMapRef = CGBitmapContextCreate(nil, W, H, 8, 0, cs,0)
            let context = CIContext(options: nil)
            let bitMapImage = context.createCGImage(self, fromRect: extent)
            CGContextSetInterpolationQuality(bitMapRef, .None)
            CGContextScaleCTM(bitMapRef, scale, scale)
            CGContextDrawImage(bitMapRef, extent, bitMapImage)
            
            let scaledImag = CGBitmapContextCreateImage(bitMapRef)
            return UIImage(CGImage: scaledImag!)
        }
    }
    
    class ViewController: UIViewController {
    
        override func viewDidLoad() {
            super.viewDidLoad()
            let filter = CIFilter(name: "CIQRCodeGenerator")
            filter?.setDefaults()
            let str = "我是小宝贝，从不怕累，虽然功课一大堆。像个小baby，最爱馋嘴，还要吃奶嘴，哈哈"
            let data = str.dataUsingEncoding(NSUTF8StringEncoding)
            filter?.setValue(data, forKey: "inputMessage")
            let img = filter?.outputImage
            let imgView = self.view.viewWithTag(1) as? UIImageView
            imgView?.image = img?.ToUiImag((imgView?.frame.width)!)
            
            // Do any additional setup after loading the view, typically from a nib.
        }
    
        override func didReceiveMemoryWarning() {
            super.didReceiveMemoryWarning()
            // Dispose of any resources that can be recreated.
        }
    
    
    }

代码从始至终都没看懂啊，只能说是翻译了一下。人家写的怎么就这么牛呢？～～～

参考：http://www.jianshu.com/p/d1675f536151

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