一、生成二维码 CoreImage框架
// 生成二维码
+ (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"]; // 设置二维码不同级别的容错率
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、生成条形码 CIFilter
// 生成条形码
+ (UIImage *)generateCode128:(NSString *)code size:(CGSize)size {
NSData *codeData = [code dataUsingEncoding:NSUTF8StringEncoding];
// 使用CICode128BarcodeGenerator创建filter
CIFilter *filter = [CIFilter filterWithName:@"CICode128BarcodeGenerator" withInputParameters:@{@"inputMessage": codeData, @"inputQuietSpace": @.0}];
// 由filter.outputImage直接转成的UIImage不太清楚，需要做高清处理
UIImage *codeImage = [QiCodeManager scaleImage:filter.outputImage toSize:size];
return codeImage;
}
// 缩放图片(生成高质量图片）
+ (UIImage *)scaleImage:(CIImage *)image toSize:(CGSize)size {
//! 将CIImage转成CGImageRef
CGRect integralRect = image.extent;// CGRectIntegral(image.extent);// 将rect取整后返回，origin取舍，size取入
CGImageRef imageRef = [[CIContext context] createCGImage:image fromRect:integralRect];
//! 创建上下文
CGFloat sideScale = fminf(size.width / integralRect.size.width, size.width / integralRect.size.height) * [UIScreen mainScreen].scale;// 计算需要缩放的比例
size_t contextRefWidth = ceilf(integralRect.size.width * sideScale);
size_t contextRefHeight = ceilf(integralRect.size.height * sideScale);
CGContextRef contextRef = CGBitmapContextCreate(nil, contextRefWidth, contextRefHeight, 8, 0, CGColorSpaceCreateDeviceGray(), (CGBitmapInfo)kCGImageAlphaNone);// 灰度、不透明
CGContextSetInterpolationQuality(contextRef, kCGInterpolationNone);// 设置上下文无插值
CGContextScaleCTM(contextRef, sideScale, sideScale);// 设置上下文缩放
CGContextDrawImage(contextRef, integralRect, imageRef);// 在上下文中的integralRect中绘制imageRef
//! 从上下文中获取CGImageRef
CGImageRef scaledImageRef = CGBitmapContextCreateImage(contextRef);
CGContextRelease(contextRef);
CGImageRelease(imageRef);
//! 将CGImageRefc转成UIImage
UIImage *scaledImage = [UIImage imageWithCGImage:scaledImageRef scale:[UIScreen mainScreen].scale orientation:UIImageOrientationUp];
return scaledImage;
}
// 合成图片（code+logo）
+ (UIImage *)combinateCodeImage:(UIImage *)codeImage andLogo:(UIImage *)logo {
UIGraphicsBeginImageContextWithOptions(codeImage.size, YES, [UIScreen mainScreen].scale);
// 将codeImage画到上下文中
[codeImage drawInRect:(CGRect){.0, .0, codeImage.size.width, codeImage.size.height}];
// 定义logo的绘制参数
CGFloat logoSide = fminf(codeImage.size.width, codeImage.size.height) / 4;
CGFloat logoX = (codeImage.size.width - logoSide) / 2;
CGFloat logoY = (codeImage.size.height - logoSide) / 2;
CGRect logoRect = (CGRect){logoX, logoY, logoSide, logoSide};
UIBezierPath *cornerPath = [UIBezierPath bezierPathWithRoundedRect:logoRect cornerRadius:logoSide / 5];
[cornerPath setLineWidth:2.0];
[[UIColor whiteColor] set];
[cornerPath stroke];
[cornerPath addClip];
// 将logo画到上下文中
[logo drawInRect:logoRect];
// 从上下文中读取image
codeImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return codeImage;
}
原地址 https://www.jianshu.com/p/81e125a04cae
