標籤:object div https api int input 設定 nsnumber rms
使用CIFilter可以不引入任何第三方庫,就可以產生想要的二維碼和條碼,今天簡單的介紹一下使用CIFilter產生二維碼和條碼。系統CIFilter產生的二維碼和條碼的大小有時並不能滿足需求,直接使用起來,二維碼圖片看起來有些模糊,這就需要我們手動的根據目標大小重建清晰的二維碼和條碼。
1.產生二維碼(iOS7.0以上支援)
/** inputCorrectionLevel 等級 容錯率 L 7% M 15% 預設值 Q 25% H 30% */+ (UIImage *)generateQRCodeWithInputMessage:(NSString *)inputMessage Width:(CGFloat)width Height:(CGFloat)height{ NSData *inputData = [inputMessage dataUsingEncoding:NSUTF8StringEncoding]; CIFilter *filter = [CIFilter filterWithName:@"CIQRCodeGenerator"]; [filter setValue:inputData forKey:@"inputMessage"]; // [filter setValue:@"H" forKey:@"inputCorrectionLevel"]; // 設定二維碼不同層級的容錯率 CIImage *ciImage = filter.outputImage; // 消除模糊 CGFloat scaleX = MIN(width, height)/ciImage.extent.size.width; CGFloat scaleY = MIN(width, height)/ciImage.extent.size.height; ciImage = [ciImage imageByApplyingTransform:CGAffineTransformScale(CGAffineTransformIdentity, scaleX, scaleY)]; UIImage *returnImage = [UIImage imageWithCIImage:ciImage]; return returnImage;}
二維碼中心添加圖片
+ (UIImage *)generateQRCodeWithInputMessage:(NSString *)inputMessage Width:(CGFloat)width Height:(CGFloat)height AndCenterImage:(UIImage *)centerImage{ UIImage *backImage = [self generateQRCodeWithInputMessage:inputMessage Width:width Height:height]; UIGraphicsBeginImageContext(backImage.size); [backImage drawInRect:CGRectMake(0, 0, backImage.size.width, backImage.size.height)]; CGFloat centerImageWH = MIN(backImage.size.width, backImage.size.height) * 0.15; [centerImage drawInRect:CGRectMake((backImage.size.width - centerImageWH)*0.5, (backImage.size.height - centerImageWH)*0.5, centerImageWH, centerImageWH)]; UIImage *returnImage = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); return returnImage;}
**2. 產生條碼 (iOS8.0以上 支援)**
#pragma mark - 擷取條碼-(UIImage*)createBarImageWithOrderStr:(NSString*)str{ // 建立條碼 CIFilter *filter = [CIFilter filterWithName:@"CICode128BarcodeGenerator"]; // 恢複濾鏡的預設屬性 [filter setDefaults]; // 將字串轉換成NSData NSData *data = [str dataUsingEncoding:NSUTF8StringEncoding]; // 通過KVO設定濾鏡inputMessage資料 [filter setValue:data forKey:@"inputMessage"]; // 獲得濾鏡輸出的映像 CIImage *outputImage = [filter outputImage]; // 將CIImage轉換成UIImage,並放大顯示 UIImage* image = [UIImage imageWithCIImage:outputImage scale:0 orientation:UIImageOrientationUp]; return image;}
+ (UIImage *)generateBarcodeWithInputMessage:(NSString *)inputMessage Width:(CGFloat)width Height:(CGFloat)height{ NSData *inputData = [inputMessage dataUsingEncoding:NSISOLatin1StringEncoding allowLossyConversion:false]; CIFilter *filter = [CIFilter filterWithName:@"CICode128BarcodeGenerator"]; [filter setValue:inputData forKey:@"inputMessage"]; // 設定條碼內容 // [filter setValue:@(50) forKey:@"inputQuietSpace"]; // 設定條碼上下左右margin值 // [filter setValue:@(height) forKey:@"inputBarcodeHeight"]; // 設定條碼高度 CIImage *ciImage = filter.outputImage; CGFloat scaleX = width/ciImage.extent.size.width; CGFloat scaleY = height/ciImage.extent.size.height; ciImage = [ciImage imageByApplyingTransform:CGAffineTransformScale(CGAffineTransformIdentity, scaleX, scaleY)]; UIImage *returnImage = [UIImage imageWithCIImage:ciImage]; return returnImage;}
/**產生條碼*/(IBAction)generateBarCode:(id)sender { CIImage ciImage = [self generateBarCodeImage:@"1234567890"]; UIImage image = [self resizeCodeImage:ciImage withSize:CGSizeMake((self.view.frame.size.width - 80), 80)]; _barCodeImageView.image = image;}/產生條碼@param source@return 產生條碼的CIImage對象*/(CIImage *) generateBarCodeImage:(NSString *)source{ // iOS 8.0以上的系統才支援條碼的產生,iOS8.0以下使用第三方控制項產生 if ([[UIDevice currentDevice].systemVersion floatValue] >= 8.0) { // 注意產生條碼的編碼方式 NSData *data = [source dataUsingEncoding: NSASCIIStringEncoding]; CIFilter *filter = [CIFilter filterWithName:@"CICode128BarcodeGenerator"]; [filter setValue:data forKey:@"inputMessage"]; // 設定產生的條碼的上,下,左,右的margins的值 [filter setValue:[NSNumber numberWithInteger:0] forKey:@"inputQuietSpace"]; return filter.outputImage; }else{ return nil; }}
**3. 產生自訂的二維碼和條碼的大小**
/**調整產生的圖片的大小@param image CIImage對象@param size 需要的UIImage的大小@return size大小的UIImage對象*/(UIImage *) resizeCodeImage:(CIImage *)image withSize:(CGSize)size{ if (image) { CGRect extent = CGRectIntegral(image.extent); CGFloat scaleWidth = size.width/CGRectGetWidth(extent); CGFloat scaleHeight = size.height/CGRectGetHeight(extent); size_t width = CGRectGetWidth(extent) * scaleWidth; size_t height = CGRectGetHeight(extent) * scaleHeight; CGColorSpaceRef colorSpaceRef = CGColorSpaceCreateDeviceGray(); CGContextRef contentRef = CGBitmapContextCreate(nil, width, height, 8, 0, colorSpaceRef, (CGBitmapInfo)kCGImageAlphaNone); CIContext *context = [CIContext contextWithOptions:nil]; CGImageRef imageRef = [context createCGImage:image fromRect:extent]; CGContextSetInterpolationQuality(contentRef, kCGInterpolationNone); CGContextScaleCTM(contentRef, scaleWidth, scaleHeight); CGContextDrawImage(contentRef, extent, imageRef); CGImageRef imageRefResized = CGBitmapContextCreateImage(contentRef); CGContextRelease(contentRef); CGImageRelease(imageRef); return [UIImage imageWithCGImage:imageRefResized]; }else{ return nil; }}
以上就是使用iOS系統原生的CIFilter產生二維碼和條碼,對於產生二維碼和條碼時,CIFilter的參數的定義可以參考官方文檔。
官網:CIFilter
iOS - 原生的CIFilter產生二維碼和條碼