ios上的pdf ios上的一次性代码

写本文的初衷：因为公司最近在研发自己的仓库管理系统，作为一个iOS屌丝，本来就不关事；但老大看我闲的蛋疼，就叫我去生成并打印一百多个仓库条形码，刚开始时候用网页的条形码生成工具生成，妈蛋！一百多个啊。。。一个一个生成，保存，你不知道对于程序员来说会死的！！所以打算用iOS写一个脚本，输入完条形码内容，一次性生成几十个条形码图片！

于是乎，开始了哥的网上大开搜。。。。。。。。。。。。。。。。

结论就是源码太少，解释更少啦！而且还没有条形码底部的文字说明！所以，就自己动手写咯！！！

实现：

一、生成条形码

直接上码啦：

func generateBarCode128(barCodeStr:String,barCodeSize:CGSize) ->UIImage? {
        //将传入的string转成nsstring，再编码
        let stringData = barCodeStr.dataUsingEncoding(NSUTF8StringEncoding)
        
        
        //系统自带能生成的码
        //        CIAztecCodeGenerator 二维码
        //        CICode128BarcodeGenerator 条形码
        //        CIPDF417BarcodeGenerator
        //        CIQRCodeGenerator     二维码
        let qrFilter = CIFilter(name: "CICode128BarcodeGenerator")
        qrFilter?.setDefaults()
        qrFilter?.setValue(stringData, forKey: "inputMessage")
        
        let outputImage:CIImage? = qrFilter?.outputImage
        
        /*
         生成的条形码需要对其进行消除模糊处理，本文提供两种方法消除模糊，其原理都是放大条码，但项目中需要在条码底部加上条码内容文字，使用其方法一会模糊并变小文字，所以使用方法二，需要各位去研究下原因哈。。。
 
         */
        
        
        // 消除模糊方法一
//        let context = CIContext()
//        let cgImage = context.createCGImage(outputImage!, fromRect: outputImage!.extent)
        
//        let image = UIImage(CGImage: cgImage, scale: 1.0, orientation: UIImageOrientation.Up)
//        
//        // Resize without interpolating
//        let scaleRate:CGFloat = 20.0
//        let resized = resizeImage(addText(image), quality: CGInterpolationQuality.None, rate: scaleRate)
        
        // 消除模糊方法二
        let scaleX:CGFloat = barCodeSize.width/outputImage!.extent.size.width; // extent 返回图片的frame
        let scaleY:CGFloat = barCodeSize.height/outputImage!.extent.size.height;
        let resultImage = outputImage?.imageByApplyingTransform(CGAffineTransformScale(CGAffineTransformIdentity, scaleX, scaleY))
        let image = UIImage.init(CIImage: resultImage!)

        return addText(image,textName: barCodeStr);
    }

二、对生成的条形码加上文字

//添加条形码下方文字
    func addText(image:UIImage,textName:String) ->UIImage{
        let size = CGSizeMake(image.size.width, image.size.height+30)
        
        UIGraphicsBeginImageContextWithOptions (size, false , 0.0 );
        
        image.drawAtPoint(CGPointZero)
        
        // 获得一个位图图形上下文
        
        let context = UIGraphicsGetCurrentContext ();
        
        CGContextDrawPath (context!, .Stroke );
        //绘制文字
        let barText:NSString = textName
        let textStyle = NSMutableParagraphStyle()
        textStyle.lineBreakMode = .ByWordWrapping
        textStyle.alignment = .Center
        
        barText.drawInRect(CGRectMake(0, image.size.height-4, size.width, 30), withAttributes: [NSFontAttributeName:UIFont.systemFontOfSize(18.0),NSBackgroundColorAttributeName:UIColor.clearColor(),NSParagraphStyleAttributeName:textStyle])
        
        
        let image = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
        return image
    }

三、最后一步：将加工过的条形码存入本地

//写入本地
    func writeToLocal(image:UIImage,imgName:String) {
        let path = (NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true) as NSArray).objectAtIndex(0)
        let filePath = "\(path)/\(imgName).jpeg"
        //            let fileurl = __stringToUrl(filePath)
        let imgData = UIImageJPEGRepresentation(image, 0)
        if imgData != nil {
            imgData!.writeToFile(filePath, atomically: true)
            print("写入成功！！")
            print("filePath=\(filePath)")
        }
    }

好了，方法都写好了，所以现在就用我们的代码生成几十张条形码吧！因为是将生成的条形码存入本地，所以跑这个应用需要用模拟器来跑，这样你就能用command+shift+G快捷键打开打印出来的文件路径啦！激动不？~~~

调用：

override func viewDidLoad() {
        super.viewDidLoad()
        
        
        barCodeNameArray = ["SN00000000001","SN00000000002","SN00000000003","SN00000000005","SN00000000006","SN00000000007","SN00000000008","SN00000000009","SN000000000010","SN00000000011","SN00000000012","SN00000000013","SN00000000014","SN00000000015","SN00000000015","SN00000000016","SN00000000017","SN00000000018","SN00000000019"]
        for codeName in barCodeNameArray {
            //异步生成条形码，并保存到本地
            let queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_BACKGROUND, 0)
            dispatch_async(queue) {
                //生成条形码
                let image = self.generateBarCode128(codeName,barCodeSize: self.barCodeSize)
                if image != nil {
                    self.writeToLocal(image!,imgName: codeName)
                }
            }
        }
        
    }