iOS二维码条形码的制作

- (IBAction)creatQRImage:(id)sender {

[self.textField resignFirstResponder];

//这里是我放了个TextField的控件，但我们没有输入值得时候就返回

if (self.textField.text.length ==0) {

return;

}

// 1.创建过滤器：做二维码还是条形码的关键CIQRCodeGenerator

CIFilter *filter = [CIFilter filterWithName:@"CIQRCodeGenerator"];

// 2.恢复默认

[filter setDefaults];

// 3.给过滤器添加数据(正则表达式/账号和密码)

NSString *dataString = self.textField.text;

NSData *data = [dataString dataUsingEncoding:NSUTF8StringEncoding];

[filter setValue:data forKeyPath:@"inputMessage"];

// 4.获取输出的二维码

CIImage *outputImage = [filter outputImage];

// 5.将CIImage转换成UIImage，并放大显示

self.imageView.image = [self createNonInterpolatedUIImageFormCIImage:outputImage withSize:200];

}

- (UIImage *)createNonInterpolatedUIImageFormCIImage:(CIImage *)image withSize:(CGFloat) size

{

//A rectangle that specifies the extent of the image. (read-only)

//This rectangle specifies the extent of the image in working space coordinates.

CGRect extent = CGRectIntegral(image.extent);

CGFloat scale = MIN(size/CGRectGetWidth(extent), size/CGRectGetHeight(extent));

// 1.创建bitmap;

size_t width = CGRectGetWidth(extent) * scale;

size_t height = CGRectGetHeight(extent) * scale;

CGColorSpaceRef cs = CGColorSpaceCreateDeviceGray();

CGContextRef bitmapRef = CGBitmapContextCreate(nil, width, height, 8, 0, cs, (CGBitmapInfo)kCGImageAlphaNone);

CIContext *context = [CIContext contextWithOptions:nil];

CGImageRef bitmapImage = [context createCGImage:image fromRect:extent];

CGContextSetInterpolationQuality(bitmapRef, kCGInterpolationNone);

CGContextScaleCTM(bitmapRef, scale, scale);

CGContextDrawImage(bitmapRef, extent, bitmapImage);

// 2.保存bitmap到图片

CGImageRef scaledImage = CGBitmapContextCreateImage(bitmapRef);

CGContextRelease(bitmapRef);

CGImageRelease(bitmapImage);

return [UIImage imageWithCGImage:scaledImage];

}

下面是条形码

- (UIImage*)generateBarCode:(NSString*)barCodeStr width:(CGFloat)width height:(CGFloat)height

{

CIImage * barcodeImage;

NSData * data = [barCodeStr dataUsingEncoding:NSUTF8StringEncoding];

CIFilter * filter = [CIFilter filterWithName:@"CICode128BarcodeGenerator"];

[filter setValue:data forKey:@"inputMessage"];

barcodeImage = [ filter outputImage];

CGFloat scaleX = width / barcodeImage.extent.size.width;

CGFloat scaleY = height / barcodeImage.extent.size.height;

CIImage * transformedImage = [barcodeImage imageByApplyingTransform:CGAffineTransformScale(CGAffineTransformIdentity, scaleX, scaleY)];

return [UIImage imageWithCIImage:transformedImage];

}