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]; }

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))];
    CGFloat width = 20;
    CGFloat height = width;
    CGFloat x = (bgImage.size.width - width) * 0.5;
    CGFloat y = (bgImage.size.height - height) * 0.5;
    [iconImage drawInRect:(CGRectMake(x, y, width, height))];
    UIImage * newImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return newImage;
}