iOS保存生成的二维码图片到相册

生成二维码

//创建滤镜
    CIFilter *filter = [CIFilter filterWithName:@"CIQRCodeGenerator"];
    
    
    //设置属性为默认值
    [filter setDefaults];
    
    //设置内容
    [filter setValue:[@"https://itunes.apple.com/cn/app/招商全能王/id1153952115?mt=8" dataUsingEncoding:NSUTF8StringEncoding] forKey:@"inputMessage"];
    
    
    CIImage *image =  [filter outputImage];
    
    image = [image imageByApplyingTransform:CGAffineTransformMakeScale(8, 8)];

    这个image是保存不到相册的，需要绘制一下

绘制图片和保存到相册中

    UIImage *newImage = [UIImage imageWithCIImage:image];
    
    UIGraphicsBeginImageContext(newImage.size);
    //  绘制二维码图片
    [newImage drawInRect:CGRectMake(0, 0, newImage.size.width, newImage.size.height)];
    
    //  从图片上下文中取出图片
    newImage  = UIGraphicsGetImageFromCurrentImageContext();
    
    //  关闭图片上下文
    UIGraphicsEndImageContext();
    //保存图片到相册
    UIImageWriteToSavedPhotosAlbum(newImage, nil, nil, NULL);