ios生成二维码，中间带圆角边框跟圆角logo图片

//生成二维码
-(void)onclick_qrcode:(id)sender{
    // 1. 创建一个二维码滤镜实例(CIFilter)
    CIFilter *filter = [CIFilter filterWithName:@"CIQRCodeGenerator"];
    // 滤镜恢复默认设置
    [filter setDefaults];
    
    // 2. 给滤镜添加数据
    NSString *string = @"这里是需要生成二维码的文字";
    NSData *data = [string dataUsingEncoding:NSUTF8StringEncoding];
    // 使用KVC的方式给filter赋值
    [filter setValue:data forKeyPath:@"inputMessage"];
    
    // 3. 生成二维码
    CIImage *image = [filter outputImage];
//    image = [image imageByApplyingTransform:CGAffineTransformMakeScale(200, 200)];
    
    //转成 UI的 类型
//    UIImage *qrUIImage = [UIImage imageWithCIImage:image];
    UIImage *qrUIImage = [self createNonInterpolatedUIImageFormCIImage:image withSize:200];
    
    //白色框
    UIImage* whiteImg = [ColorUtil colorToImage:[ColorUtil colorWithHexString:COLOR_WHITE]];
    
    //----------------给 二维码 中间增加一个 自定义图片----------------
    //开启绘图,获取图形上下文  (上下文的大小,就是二维码的大小)
    UIGraphicsBeginImageContext(qrUIImage.size);
    
    //把二维码图片画上去. (这里是以,图形上下文,左上角为 (0,0)点)
    [qrUIImage drawInRect:CGRectMake(0, 0, qrUIImage.size.width, qrUIImage.size.height)];
    
    
    //再把小图片画上去
    UIImage *sImage = [UIImage imageNamed:@"app_logo"];
    
    CGFloat sImageW = qrUIImage.size.width/4;
    CGFloat sImageH= sImageW;
    CGFloat sImageX = (qrUIImage.size.width - sImageW) * 0.5;
    CGFloat sImgaeY = (qrUIImage.size.height - sImageH) * 0.5;
    
    //画圆角背景
    [[UIBezierPath bezierPathWithRoundedRect:CGRectMake(sImageX, sImgaeY, sImageW, sImageH) cornerRadius:5] addClip];
    [whiteImg drawInRect:CGRectMake(sImageX, sImgaeY, sImageW, sImageH)];
    
    //画圆角logo
    [[UIBezierPath bezierPathWithRoundedRect:CGRectMake(sImageX+3, sImgaeY+3, sImageW-6, sImageH-6) cornerRadius:5] addClip];
    [sImage drawInRect:CGRectMake(sImageX+3, sImgaeY+3, sImageW-6, sImageH-6)];
    
    //获取当前画得的这张图片
    UIImage *finalyImage = UIGraphicsGetImageFromCurrentImageContext();
    
    //关闭图形上下文
    UIGraphicsEndImageContext();
    
    // 4. 显示二维码
    MyLinearLayout* qrcodeLayout = [MyLinearLayout linearLayoutWithOrientation:MyLayoutViewOrientation_Vert];
    qrcodeLayout.myMargin = 0;
    qrcodeLayout.backgroundColor = [ColorUtil colorWithHexString:COLOR_BLACK alpha:.6];
    qrcodeLayout.gravity = MyMarginGravity_Center;
    [qrcodeLayout setTarget:self action:@selector(onclick_qrcode_close:)];
    [self.view addSubview:qrcodeLayout];
    
    UIImageView* qrcodeImg = [UIImageView new];
    qrcodeImg.widthDime.equalTo(@200);
    qrcodeImg.heightDime.equalTo(@200);
//    qrcodeImg.image = [self createNonInterpolatedUIImageFormCIImage:image withSize:200];
    qrcodeImg.image = finalyImage;
    [qrcodeLayout addSubview:qrcodeImg];
}

- (UIImage *)createNonInterpolatedUIImageFormCIImage:(CIImage *)image withSize:(CGFloat)size {
    CGRect extent = CGRectIntegral(image.extent);
    
    //设置比例
    CGFloat scale = MIN(size/CGRectGetWidth(extent), size/CGRectGetHeight(extent));
    
    // 创建bitmap（位图）;
    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];
}

-(void)onclick_qrcode_close:(MyLinearLayout*)layout{
    [layout removeFromSuperview];
}