1.扫码. 网上有特别的关于iOS扫码的代码和示例,其中扫码主要使用的是自带的AVFoundation类.这里就不细说了,要注意的是如何设置扫描区域,识别区域(这个值是按比例0~1设置,而且X、Y要调换位置,width、height调换位置)
- <span style="font-size:14px;">//创建输出流
- AVCaptureMetadataOutput * output = [[AVCaptureMetadataOutput alloc]init];
- //设置识别区域 (这个值是按比例0~1设置,而且X、Y要调换位置,width、height调换位置)
- output.rectOfInterest = CGRectMake(Y /ScreenHeight, X /ScreenWidth, height /ScreenHeight, width /ScreenWidth)</span>
2. 获取相册中的二维码图片,用CIDetector类,但是这个类只能识别二维码图片,条形码目前暂不支持
- <span style="font-size:14px;">//要实现两个代理方法
- <UIImagePickerControllerDelegate,UINavigationControllerDelegate>
- </span>
- <span style="font-size:14px;">-(void)imagePickerController:(UIImagePickerController*)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
- {
- // 创建探测器 CIDetectorTypeQRCode
- CIDetector *detector = [CIDetector detectorOfType: CIDetectorTypeText context:nil options:@{CIDetectorAccuracy: CIDetectorAccuracyLow}];
- [picker dismissViewControllerAnimated:YES completion:^{
- }];
- // 取出选中的图片
- UIImage *pickImage = info[UIImagePickerControllerOriginalImage];
- // 设置数组,放置识别完之后的数据
- NSArray *features = [detector featuresInImage:[CIImage imageWithData:UIImagePNGRepresentation(pickImage)]];
- // 判断是否有数据(即是否是二维码)
- if (features.count >= 1) {
- // 取第一个元素就是二维码所存放的文本信息
- CIQRCodeFeature *feature = features[0];
- NSString *scannedResult = feature.messageString;
- // 触发回调
- [self getScanDataString:scannedResult];
- }else{
- [self getScanDataString:@"未识别图片中的二维码"];
- }
- }</span>
用CIDetector类读取相册中的二维码遇到的问题是手机截屏的图片可以读取成功,手机拍照的图片取出成功率比较低。并且不支持读取条形码。
解决办法:读取相册中的二维码/条形码,使用ZBarSDK,下面介绍一下怎么在工程中引入ZBarSDK,因为我的Demo工程没有使用CocoaPods去管理第三方库,所以介绍手动将ZBarSDK导入工程并配置。步骤一.在工程中建一个Frameworks文件夹将ZBarSDK文件夹导入,如图
步骤二.在工程中添加依赖库,如图:
步骤三.导入头文件并调用对应方法。
#import "ZBarSDK.h"
- - (void)getQRcodeImage {
- // ZBarsSDK 初始化
- ZBarReaderController *imagePicker = [ZBarReaderController new];
- imagePicker.showsHelpOnFail = NO; // 禁止显示读取失败页面
- imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
- imagePicker.delegate = self;
- imagePicker.allowsEditing = YES;
- [self presentViewController:imagePicker animated:YES completion:nil];
- }
- /**
- * 选中图片的回调
- */
- -(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:^{
- //二维码字符串
- NSString *QRCodeString = symbol.data;
- // 触发回调
- [self getScanDataString:QRCodeString];
- }];
- }
- /**
- * 读取二维码/条码失败的回调
- */
- -(void)readerControllerDidFailToRead:(ZBarReaderController *)reader withRetry:(BOOL)retry{
- if (retry) { //retry == 1 选择图片为非二维码。
- [self dismissViewControllerAnimated:YES completion:^{
- [self getScanDataString:@"未发现二维码/条码"];
- }];
- }
- return;
- }