一、识别身份证
@interface IDCardScanViewController () <AVCaptureMetadataOutputObjectsDelegate>
@property (nonatomic, strong) AVCaptureSession *captureSession;
@end
@implementation IDCardScanViewController
super viewDidLoad\];
// 创建视频预览层
AVCaptureVideoPreviewLayer \*previewLayer = \[\[AVCaptureVideoPreviewLayer alloc\] initWithSession:self.captureSession\];
previewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;
previewLayer.frame = self.scanView.bounds;
\[self.scanView.layer addSublayer:previewLayer\];
// 创建数据输出
AVCaptureMetadataOutput \*output = \[\[AVCaptureMetadataOutput alloc\] init\];
\[self.captureSession addOutput:output\];
\[output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()\];
// 设置扫描支持的码类型
if (\[output.availableMetadataObjectTypes containsObject:AVMetadataObjectTypeIDCard\]) {
output.metadataObjectTypes = @\[AVMetadataObjectTypeIDCard\];
}
// 启动扫描
\[self.captureSession startRunning\];
}
- (AVCaptureSession \*)captureSession {
if (!_captureSession) {
_captureSession = \[\[AVCaptureSession alloc\] init\];
// 配置摄像头输入
AVCaptureDevice \*device = \[AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo\];
AVCaptureDeviceInput \*input = \[AVCaptureDeviceInput deviceInputWithDevice:device error:nil\];
\[_captureSession addInput:input\];
}
return _captureSession;
}
- (void)captureOutput:(AVCaptureOutput \*)captureOutput didOutputMetadataObjects:(NSArray\<__kindof AVMetadataObject \*\> \*)metadataObjects fromConnection:(AVCaptureConnection \*)connection {
for (AVMetadataObject \*metadata in metadataObjects) {
if (\[metadata isKindOfClass:\[AVMetadataMachineReadableCodeObject class\]\]) {
AVMetadataMachineReadableCodeObject \*code = (AVMetadataMachineReadableCodeObject \*)metadata;
if (\[code.type isEqualToString:AVMetadataObjectTypeIDCard\]) {
NSString \*result = code.stringValue;
// 对扫描结果进行处理
NSLog(@"扫描结果：%@", result);
}
}
}
}
下面的方法需要iOS13以上才能支持
#import \
#import \
@interface ViewController () \
@end
@implementation ViewController
- (void)viewDidLoad {
\[super viewDidLoad\];
// 在需要的地方调用此方法启动身份证扫描
\[self startDocumentCapture\];
}
- (void)startDocumentCapture {
VNDocumentCameraViewController \*documentCameraViewController = \[\[VNDocumentCameraViewController alloc\] init\];
documentCameraViewController.delegate = self;
\[self presentViewController:documentCameraViewController animated:YES completion:nil\];
}
#pragma mark - VNDocumentCameraViewControllerDelegate
- (void)documentCameraViewController:(VNDocumentCameraViewController \*)controller didFinishWithScan:(VNDocumentCameraScan \*)scan {
// 遍历扫描结果
for (NSUInteger pageIndex = 0; pageIndex \< scan.pageCount; pageIndex++) {
VNPage \*page = \[scan pageAtIndex:pageIndex\];
// 检查扫描结果是否为身份证
if (\[self isIdentityCard:page\]) {
// 获取身份证号码和姓名
NSString \*number = \[self identityCardNumberFromPage:page\];
NSString \*name = \[self identityCardNameFromPage:page\];
NSLog(@"身份证号码：%@", number);
NSLog(@"姓名：%@", name);
// 在这里进行身份证识别后的处理
}
}
// 关闭扫描视图控制器
\[controller dismissViewControllerAnimated:YES completion:nil\];
}
- (void)documentCameraViewControllerDidCancel:(VNDocumentCameraViewController \*)controller {
// 用户取消了扫描，关闭扫描视图控制器
\[controller dismissViewControllerAnimated:YES completion:nil\];
}
- (void)documentCameraViewController:(VNDocumentCameraViewController \*)controller didFailWithError:(NSError \*)error {
// 扫描失败，处理错误信息
NSLog(@"扫描身份证发生错误：%@", error);
\[controller dismissViewControllerAnimated:YES completion:nil\];
}
#pragma mark - Helper Methods
- (BOOL)isIdentityCard:(VNPage \*)page {
// 获取页面文本内容
NSString \*text = page.recognizedText.string;
// 判断是否包含"公民身份号码"和"姓名"关键字
if (\[text containsString:@"公民身份号码"\] \&\& \[text containsString:@"姓名"\]) {
return YES;
}
return NO;
}
- (NSString \*)identityCardNumberFromPage:(VNPage \*)page {
// 获取页面文本内容
NSString \*text = page.recognizedText.string;
// 查找身份证号码
NSRange range = \[text rangeOfString:@"公民身份号码"\];
if (range.location != NSNotFound) {
NSString \*number = \[text substringFromIndex:range.location + range.length\];
number = \[number stringByReplacingOccurrencesOfString:@" " withString:@""\];
return number;
}
return nil;
}
- (NSString \*)identityCardNameFromPage:(VNPage \*)page {
// 获取页面文本内容
NSString \*text = page.recognizedText.string;
// 查找姓名
NSRange range = \[text rangeOfString:@"姓名"\];
if (range.location != NSNotFound) {
NSString \*name = \[text substringFromIndex:range.location + range.length\];
name = \[name stringByReplacingOccurrencesOfString:@" " withString:@""\];
return name;
}
return nil;
}
@end
**二、识别图片上的文字**
#import \
@interface ViewController ()
@end
@implementation ViewController
- (void)viewDidLoad {
\[super viewDidLoad\];
UIImage \*image = \[UIImage imageNamed:@"test_image.jpg"\];
\[self recognizeTextInImage:image\];
}
- (void)recognizeTextInImage:(UIImage \*)image {
// 创建VNImageRequestHandler对象
VNImageRequestHandler \*requestHandler = \[\[VNImageRequestHandler alloc\] initWithCGImage:image.CGImage options:@{}\];
// 创建VNRecognizeTextRequest对象
VNRecognizeTextRequest \*textRequest = \[\[VNRecognizeTextRequest alloc\] initWithCompletionHandler:\^(VNRequest \* _Nonnull request, NSError \* _Nullable error) {
// 处理识别结果
if (error == nil) {
NSArray \*results = request.results;
NSMutableString \*recognizedText = \[NSMutableString string\];
for (VNRecognizedTextObservation \*observation in results) {
for (VNRecognizedText \*text in observation.topCandidates(1)) {
\[recognizedText appendString:text.string\];
\[recognizedText appendString:@"\\n"\];
}
}
NSLog(@"识别结果：%@", recognizedText);
// 在这里进行识别后的处理
} else {
NSLog(@"识别出错：%@", error);
}
}\];
// 设置识别方式和语种
textRequest.recognitionLevel = VNRequestTextRecognitionLevelAccurate;
textRequest.usesLanguageCorrection = YES;
// 发送识别请求
NSError \*requestError = nil;
\[requestHandler performRequests:@\[textRequest\] error:\&requestError\];
if (requestError != nil) {
NSLog(@"发送识别请求出错：%@", requestError);
}
}
@end