iOSS--生成有logo的二维码

- (void)viewDidLoad {

    [super viewDidLoad];

    // Do any additional setup after loading the view, typically from a nib.

    self.imageview = [[UIImageView alloc] initWithFrame:CGRectMake(, , , )];

    [self.view addSubview:_imageview];

    [self createLogoImage];

}

- (void)createLogoImage {

    NSArray *filter = [CIFilter filterNamesInCategory:kCICategoryBuiltIn];

    NSLog(@"%@", filter);

    // 二维码过滤器

    CIFilter *filterImage = [CIFilter filterWithName:@"CIQRCodeGenerator"];

    // 将二位码过滤器设置为默认属性

    [filterImage setDefaults];

    // 将文字转化为二进制

    NSData *dataImage = [@"mafeng" dataUsingEncoding:NSUTF8StringEncoding];

    // 打印输入的属性

    NSLog(@"%@", filterImage.inputKeys);

    // KVC 赋值

    [filterImage setValue:dataImage forKey:@"inputMessage"];

    // 取出输出图片

    CIImage *outputImage = [filterImage outputImage];

    outputImage = [outputImage imageByApplyingTransform:CGAffineTransformMakeScale(, )];

    // 转化图片

    UIImage *image = [UIImage imageWithCIImage:outputImage];

    // **********为二维码加自定义图片***********

    // 开启绘图, 获取图片 上下文<图片大小>

    UIGraphicsBeginImageContext(image.size);

    // 将二维码图片画上去

    [image drawInRect:CGRectMake(, , image.size.width, image.size.height)];

    // 将小图片画上去

    UIImage *smallImage = [UIImage imageNamed:@"123.jpg"];

    [smallImage drawInRect:CGRectMake((image.size.width - ) / , (image.size.width - ) / , , )];

    // 获取最终的图片

    UIImage *finalImage = UIGraphicsGetImageFromCurrentImageContext();

    // 关闭上下文

    UIGraphicsEndImageContext();

    // 显示

    self.imageview.image = finalImage;

}