Objective_C系统自带生成二维码

根据字符创创建二维码

- (UIImage *)createQRForString:(NSString *)qrString{    CIFilter *filter = [CIFilter filterWithName:@"CIQRCodeGenerator"];    [filter setDefaults];    NSData *stringData = [qrString dataUsingEncoding:NSUTF8StringEncoding];    [filter setValue:stringData forKey:@"inputMessage"];    CIImage *ciImage = [filter outputImage];   //创建普通二维码   //UIImage *image = [UIImage imageWithCIImage:ciImage];   //创建高清二维码    UIImage *image = [self creatImage:ciImage size:100];    //头像图片    UIImage *icon = [UIImage imageName:@"头像图片"];   //在二维码中间加入头像    UIImage *newImage = [self creatImageIcon:image icon:icon];    return newImage;}

创建高清二维码

-(UIImage*)creatImage:(CIImage*)imgae size:(CGFloat)size{    CGRect extent = CGRectIntegral(imgae.extent);    CGFloat scale = MIN(size/CGRectGetWidth(extent), size/CGRectGetHeight(extent));    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:imgae fromRect:extent];    CGContextSetInterpolationQuality(bitmapRef, kCGInterpolationNone);    CGContextScaleCTM(bitmapRef, scale, scale);    CGContextDrawImage(bitmapRef, extent, bitmapImage);    CGImageRef scaledImage = CGBitmapContextCreateImage(bitmapRef);    CGContextRelease(bitmapRef);    CGImageRelease(bitmapImage);    return [UIImage imageWithCGImage:scaledImage];}

在二维码中央加入头像

- (UIImage*)creatImageIcon:(UIImage*)bgImage icon:(UIImage*)iconImage{    UIGraphicsBeginImageContext(bgImage.size);    [bgImage drawInRect:(CGRectMake(0,0, bgImage.size.width, bgImage.size.height))];CGFloatwidth =20;CGFloatheight = width;CGFloatx = (bgImage.size.width- width) *0.5;CGFloaty = (bgImage.size.height- height) *0.5;    [iconImage drawInRect:(CGRectMake(x, y, width, height))];UIImage* newImage = UIGraphicsGetImageFromCurrentImageContext();    UIGraphicsEndImageContext();returnnewImage;}

来源：https://download.csdn.net/blog/column/9267809/51051192