iOS中自定义带有中心小图片的二维码

今天遇到一个中间要有一个小图片的二维码的需求，以前用的都是自带的没有图片的二维码，这回加了一个图片，没啥办法，研究吧。。废话不多说，先上效果图：

效果就如图片那样，下面我介绍一下整体思路：

1.创建一个装二维码的图片放到父容器的中心位置，代码如下：

 self.imageView = [[UIImageView alloc]initWithFrame:CGRectMake(0, 0, 200, 200)];
    [self.view addSubview:self.imageView ];
    self.imageView.center = self.view.center;

2.创建二维码图片，并在图片中心放一个Logo图片，下面是创建的二维码就是方法，参数是我们想要访问的链接，并未我们创建的二维码图片添加长按手势

#pragma mark - 生成二维码
- (void)createCoreImage:(NSString *)codeStr{
    
    //1.生成coreImage框架中的滤镜来生产二维码
    CIFilter *filter=[CIFilter filterWithName:@"CIQRCodeGenerator"];
    [filter setDefaults];
    
    [filter setValue:[codeStr dataUsingEncoding:NSUTF8StringEncoding] forKey:@"inputMessage"];
    //4.获取生成的图片
    CIImage *ciImg=filter.outputImage;
    //放大ciImg,默认生产的图片很小
    
    //5.设置二维码的前景色和背景颜色
    CIFilter *colorFilter=[CIFilter filterWithName:@"CIFalseColor"];
    //5.1设置默认值
    [colorFilter setDefaults];
    [colorFilter setValue:ciImg forKey:@"inputImage"];
    [colorFilter setValue:[CIColor colorWithRed:0 green:0 blue:0] forKey:@"inputColor0"];
    [colorFilter setValue:[CIColor colorWithRed:1 green:1 blue:1] forKey:@"inputColor1"];
    //5.3获取生存的图片
    ciImg=colorFilter.outputImage;
    
    CGAffineTransform scale=CGAffineTransformMakeScale(10, 10);
    ciImg=[ciImg imageByApplyingTransform:scale];
    
    //    self.imgView.image=[UIImage imageWithCIImage:ciImg];
    
    //6.在中心增加一张图片
    UIImage *img=[UIImage imageWithCIImage:ciImg];
    //7.生存图片
    //7.1开启图形上下文
    UIGraphicsBeginImageContext(img.size);
    //7.2将二维码的图片画入
    //BSXPCMessage received error for message: Connection interrupted   why??
    //    [img drawInRect:CGRectMake(10, 10, img.size.width-20, img.size.height-20)];
    [img drawInRect:CGRectMake(0, 0, img.size.width, img.size.height)];
    //7.3在中心划入其他图片
    
    UIImage *centerImg=[UIImage imageNamed:@"hwj"];
    
    CGFloat centerW=70;
    CGFloat centerH=70;
    CGFloat centerX=(img.size.width-70)*0.5;
    CGFloat centerY=(img.size.height -70)*0.5;
    
    [centerImg drawInRect:CGRectMake(centerX, centerY, centerW, centerH)];
    
    //7.4获取绘制好的图片
    UIImage *finalImg=UIGraphicsGetImageFromCurrentImageContext();
    
    //7.5关闭图像上下文
    UIGraphicsEndImageContext();
    //设置图片
    self.imageView.image = finalImg;
    self.imageView.userInteractionEnabled = YES;
    //长按手势识别器
    UILongPressGestureRecognizer *pressGesture=[[UILongPressGestureRecognizer alloc]initWithTarget:self action:@selector(handleLongPress:)];
    [self.imageView addGestureRecognizer:pressGesture];
    
}

3.再长按手势的方法中弹出 Alert 

-(void)handleLongPress:(UILongPressGestureRecognizer *)uilpgr
{
    
    
    if (uilpgr.state != UIGestureRecognizerStateBegan){
        return;
    }
    
    UIAlertController *alert = [UIAlertController alertControllerWithTitle:nil message:nil preferredStyle:UIAlertControllerStyleActionSheet];
    
    UIAlertAction *action1 = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction *action) {
        
    }];
    
    
    UIAlertAction *action2 = [UIAlertAction actionWithTitle:@"保存到相册" style:UIAlertActionStyleDefault handler:^(UIAlertAction *action) {
        
        //保存到相册
        UIImageWriteToSavedPhotosAlbum(self.imageView.image, self, @selector(image:didFinishSavingWithError:contextInfo:), NULL);
        
    }];
    
    [alert addAction:action1];
    [alert addAction:action2];

    [self presentViewController:alert animated:YES completion:nil];
  
}

4.把图片存入相册

// 存相册
- (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo
{
    if(!error){
//        [self showToastMessage:@"保存成功"];
        NSLog(@"保存成功");
    }else{
        NSLog(@"保存失败");
//        [self showToastMessage:@"保存失败"];
    }
}

真的比我想象的简单多了，如果感兴趣的话就试试吧。。