从图片中识别二维码/条码(非扫描)

1.首先要导入CoreImage.framework框架

2.引入<CoreImage/CoreImage.h>头文件

#import <CoreImage/CoreImage.h>

从图片中识别二维码

-(NSArray \*)detectQRCode:(UIImage \*)qrcodeImage
{
    NSDictionary \*opts=@{CIDetectorAccuracy:CIDetectorAccuracyHigh};
    CIDetector \*detector=[CIDetector detectorOfType:CIDetectorTypeQRCode context:nil options:opts];
    CIImage \*cimage=[CIImage imageWithCGImage:qrcodeImage.CGImage];
    NSArray \*features=[detector featuresInImage:cimage];
    return features;
}

3.使用方法如下

条码或二维码识别

- (void)viewDidLoad
{
    [super viewDidLoad];
    
    //带二维码或条码的照片
    UIImage \*image=[UIImage imageNamed:@"code.png"];
    NSArray \*features=[self detectQRCode:image];
    //可能会存在多个二维码，这里只考虑一个的情况
    if(features.count>0)
    {
        CIQRCodeFeature \*code=[features firstObject];
        NSLog(@"识别结果:%@",code.messageString);
    }
}