二维码生成

 1.创建滤镜
 2.设置默认
3.设置内容
4.设置图片
5.设置图片原比例变大8,8
6.设置图片信息
- (void)touchesBegan:(NSSet<UITouch

*> *)touches withEvent:(UIEvent

*)event

{

   
//https://www.baidu.com

   

   
//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://www.baidu.com"

dataUsingEncoding:NSUTF8StringEncoding]

forKey:@"inputMessage"];

   

   

   
CIImage
*image =  [filter
outputImage];

   

    image = [image
imageByApplyingTransform:CGAffineTransformMakeScale(8,

8)];

   

   
self.imageView.image

= [UIImage

imageWithCIImage:image];

   

   
}