<span style="font-size:14px;">//創(chuàng)建輸出流 
AVCaptureMetadataOutput * output = [[AVCaptureMetadataOutput alloc]init]; 
 //設置識別區(qū)域 （這個值是按比例0~1設置，而且X、Y要調(diào)換位置，width、height調(diào)換位置） 
  output.rectOfInterest = CGRectMake(Y /ScreenHeight, X /ScreenWidth, height /ScreenHeight, width /ScreenWidth)</span> 

<span style="font-size:14px;">//要實現(xiàn)兩個代理方法 
<UIImagePickerControllerDelegate,UINavigationControllerDelegate> 
</span> 
[objc] view plain copy 在CODE上查看代碼片派生到我的代碼片
<span style="font-size:14px;">-(void)imagePickerController:(UIImagePickerController*)picker didFinishPickingMediaWithInfo:(NSDictionary *)info 
{ 
  // 創(chuàng)建探測器 CIDetectorTypeQRCode 
  CIDetector *detector = [CIDetector detectorOfType: CIDetectorTypeText context:nil options:@{CIDetectorAccuracy: CIDetectorAccuracyLow}]; 
    [picker dismissViewControllerAnimated:YES completion:^{ 
    }]; 
  // 取出選中的圖片 
  UIImage *pickImage = info[UIImagePickerControllerOriginalImage]; 
  // 設置數(shù)組，放置識別完之后的數(shù)據(jù) 
  NSArray *features = [detector featuresInImage:[CIImage imageWithData:UIImagePNGRepresentation(pickImage)]]; 
  // 判斷是否有數(shù)據(jù)（即是否是二維碼） 
  if (features.count >= 1) { 
    // 取第一個元素就是二維碼所存放的文本信息 
    CIQRCodeFeature *feature = features[0]; 
    NSString *scannedResult = feature.messageString; 
    // 觸發(fā)回調(diào) 
    [self getScanDataString:scannedResult]; 
  }else{ 
    [self getScanDataString:@"未識別圖片中的二維碼"]; 
  } 
}</span>

#import "ZBarSDK.h"
/<span style="font-size:18px;">** 
 * 獲取相冊中的二維碼圖片 
 */ 
- (void)getQRcodeImage { 
  // ZBarsSDK 初始化 
  ZBarReaderController *imagePicker = [ZBarReaderController new]; 
  imagePicker.showsHelpOnFail = NO; // 禁止顯示讀取失敗頁面 
  imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary; 
  imagePicker.delegate = self; 
  imagePicker.allowsEditing = YES; 
  [self presentViewController:imagePicker animated:YES completion:nil]; 
} 
/** 
 * 選中圖片的回調(diào) 
 */ 
-(void)imagePickerController:(UIImagePickerController*)picker didFinishPickingMediaWithInfo:(NSDictionary *)info 
{ 
  id<NSFastEnumeration> results = [info objectForKey:ZBarReaderControllerResults]; 
  ZBarSymbol *symbol = nil; 
  for(symbol in results) { 
    break; 
  } 
  [picker dismissViewControllerAnimated:YES completion:^{ 
    //二維碼字符串 
    NSString *QRCodeString = symbol.data; 
    // 觸發(fā)回調(diào) 
    [self getScanDataString:QRCodeString]; 
}]; 
} 
/** 
 * 讀取二維碼/條碼失敗的回調(diào) 
 */ 
-(void)readerControllerDidFailToRead:(ZBarReaderController *)reader withRetry:(BOOL)retry{ 
  if (retry) { //retry == 1 選擇圖片為非二維碼。 
    [self dismissViewControllerAnimated:YES completion:^{ 
      [self getScanDataString:@"未發(fā)現(xiàn)二維碼/條碼"]; 
    }]; 
  } 
  return; 
}</span>