iOS 识别图片二维码demo，复制粘贴即用

 

 

 

 

 

 

 

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#import "ViewController.h"   @interface ViewController ()<UIImagePickerControllerDelegate,UINavigationControllerDelegate>   /** 背景图片 */ @property (nonatomic, strong) UIImageView *imgView;   @end   @implementation ViewController - (UIImageView *)imgView {     if (!_imgView) {         UIImageView *imgView = [[UIImageView alloc] init];         imgView.backgroundColor = [UIColor greenColor];         [self.view addSubview:imgView];         _imgView = imgView;     }     return _imgView; } - (void)viewDidLoad {     [super viewDidLoad];     // Do any additional setup after loading the view.     self.view.backgroundColor = [UIColor grayColor];       CGFloat imgX = 50;     CGFloat imgY = 200;     CGFloat imgW = 300;     CGFloat imgH = 300;     self.imgView.frame = CGRectMake(imgX, imgY, imgW, imgH);                 UIButton *btn = [UIButton buttonWithType:UIButtonTypeSystem];     btn.frame = CGRectMake(40, 550, 200, 50);     [btn setTitle:@"选照片" forState:UIControlStateNormal];     [btn setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];     btn.titleLabel.font = [UIFont systemFontOfSize:15];           [btn addTarget:self action:@selector(btnClick) forControlEvents:UIControlEventTouchUpInside];     [self.view addSubview:btn]; }   /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// #pragma mark - 从系统相册中选择 选取 - (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info{     UIImage *image = [info objectForKey:UIImagePickerControllerOriginalImage];     _imgView.image = image;     [picker dismissViewControllerAnimated:YES completion:nil];           UIGraphicsBeginImageContextWithOptions(self.view.bounds.size, YES, 2.2);     CGContextRef context = UIGraphicsGetCurrentContext();     [self.view.layer renderInContext:context];     _imgView.image = UIGraphicsGetImageFromCurrentImageContext();     UIGraphicsEndImageContext();           NSString *sss = [self stringValueFrom:_imgView.image];     NSLog(@"结果是666：%@",sss); } #pragma mark - 从系统相册中选择 取消 - (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker{     [picker dismissViewControllerAnimated:YES completion:nil]; } #pragma mark -//系统识别相册二维码 -(NSString *)stringValueFrom:(UIImage *)image{     ///系统识别二维码     CIDetector *detector = [CIDetector detectorOfType:CIDetectorTypeQRCode context:nil options:@{CIDetectorAccuracy: CIDetectorAccuracyHigh}];     // 取得识别结果     NSArray *features = [detector featuresInImage:[CIImage imageWithCGImage:image.CGImage]];     NSString *resultStr;     if (features.count == 0) {         return @"请检查图片是不是二维码";     }     for (int index = 0; index < [features count]; index ++) {         CIQRCodeFeature *feature = [features objectAtIndex:index];         resultStr = feature.messageString;     }     return resultStr; } ///////////////////////////////////////////////////////////////////////////////////