【iOS】生成二维码

• 直接上干货

#import <Foundation/Foundation.h>

NS_ASSUME_NONNULL_BEGIN

@interface QRCodeGenerator : NSObject
+(instancetype)shareInstance;


- (UIImage *)creatQRGeneratorWithCenterImage:(UIImage *)centerImage textStr:(NSString*)str;

@end

NS_ASSUME_NONNULL_END

#import "QRCodeGenerator.h"
static QRCodeGenerator * _instance;
@implementation QRCodeGenerator

+ (instancetype)shareInstance{
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken,^{
        _instance = [[self alloc] init];
    });
    return _instance;
}


- (UIImage *)creatQRGeneratorWithCenterImage:(UIImage *)centerImage textStr:(NSString*)str{
    /// 1.创建二维码过滤器
    CIFilter * qrFilter = [CIFilter filterWithName:@"CIQRCodeGenerator"];
    /// 2.设置默认值
    [qrFilter setDefaults];
    
    [qrFilter setValue:[str dataUsingEncoding:NSUTF8StringEncoding] forKey:@"inputMessage"];
    // 4.获取二维码的图片
    CIImage *ciimage = qrFilter.outputImage;
    // 放大图片的比例
//    ciimage = [ciimage imageByApplyingTransform:CGAffineTransformMakeScale(9, 9)];
    /// 返回image
    
    UIImage *newImage = [self createNonInterpolatedUIImageFormCIImage:ciimage withSize:300];
//    return [UIImage imageWithCIImage:ciimage] ;
    return [self qrGeneratorAddCenterImage:centerImage originalImage:newImage];
}


//--生成高清二维码
- (UIImage *)createNonInterpolatedUIImageFormCIImage:(CIImage *)image withSize:(CGFloat) size {
    CGRect extent = CGRectIntegral(image.extent);
    CGFloat scale = MIN(size/CGRectGetWidth(extent), size/CGRectGetHeight(extent));
    // 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);
     // 保存 bitmap 到图片
     CGImageRef scaledImage = CGBitmapContextCreateImage(bitmapRef);
     CGContextRelease(bitmapRef);
     CGImageRelease(bitmapImage);
     return [UIImage imageWithCGImage:scaledImage];
}


-(UIImage *)qrGeneratorAddCenterImage:(UIImage *)image originalImage:(UIImage *)originalImage{
    /// 开启图形上下文
    UIGraphicsBeginImageContext(originalImage.size);
    /// 画二维码的图片
    [originalImage drawInRect:CGRectMake(0, 0, originalImage.size.width, originalImage.size.height)];
    
    CGFloat meImageW = 50;
    CGFloat meImageH = 50;
    CGFloat meImageX = (originalImage.size.width - meImageW) * 0.5;
    CGFloat meImageY = (originalImage.size.height - meImageH) * 0.5;
    
    /// 画中心图片
    [image drawInRect:CGRectMake(meImageX, meImageY, meImageW, meImageH)];
    
    /// 获取图片
    UIImage *finalImage = UIGraphicsGetImageFromCurrentImageContext();
    /// 关闭图形上下文
    UIGraphicsEndImageContext();
    
    return finalImage;
    
    
    
    
    
    
}

• 这是生成中间带图片的

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标签：originalImage,iOS,生成,二维码,bitmapRef,extent,UIImage,CGFloat,size
来源： https://blog.csdn.net/Emperor_huanzi/article/details/114319359