ZXingObjC captureResult never call - ios

Question

I need to write a scanner on the ios/react-native app. Before this project has used another scanner, but that now doesn't work. I have UIView and UIViewController. In the built app, the camera is showing, but when I aim the camera on the barcode, nothing happens, captureResult does not call. So I am new to IOS and don't know how to fix it.
MyView.h
#import <UIKit/UIView.h>
#import <ZXingObjC/ZXingObjC.h>
#import <React/RCTComponent.h>
#import "MyViewController.h"
​
#interface MyView: UIView <ZXCaptureDelegate>
#property (nonatomic, strong) MyViewController *scannerController;
#property (nonatomic, copy) RCTBubblingEventBlock onClose;
#property (nonatomic, copy) RCTBubblingEventBlock onCaptureVin;
#property (nonatomic, copy) RCTBubblingEventBlock onEnterVinManuallyPress;
#end
MyView.m
#import "MyView.h"
#import "MyViewController.h"
#import <UIKit/UIKit.h>
#import <AVKit/AVKit.h>
#import <sys/utsname.h>
UIColor *fillColor;
UIButton *flashButton;
#implementation MyView
int additionalHeightIphoneX = 34;
//===============//
// INITIALIZE SDK
//===============//
- (instancetype)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
self.scannerController = [[MyViewController alloc] initWithNibName: nil bundle: nil];
[self.scannerController.capture setDelegate: self];
[self.scannerController.capture start];
return self;
}
- (void)layoutSubviews
{
[super layoutSubviews];
[self.subviews makeObjectsPerformSelector: #selector(removeFromSuperview)];
[self addSubview:self.scannerController.view];
self.scannerController.view.frame = self.bounds;
fillColor = [UIColor colorWithRed:29/255.0f green:41/255.0f blue:50/255.0f alpha:0.8];
[self createHeader];
[self createTarget];
[self createManualVinEntryButton];
[self createCancelButton];
}
- (void)captureResult:(ZXCapture *)capture result:(ZXResult *)result {
UILabel* label = [[UILabel alloc] init];
label.font = [UIFont systemFontOfSize:36];
label.text = result.text;
label.textColor = [UIColor yellowColor];
label.backgroundColor =
[[UIColor blackColor] colorWithAlphaComponent:0.5];
[label sizeToFit];
label.center = CGPointMake(self.bounds.size.width/2,
self.bounds.size.height/2);
[self addSubview:label];
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:1.0];
[UIView setAnimationDelegate:label];
[UIView setAnimationDidStopSelector:#selector(removeFromSuperview)];
label.alpha = 0;
[UIView commitAnimations];
[self sendVinCode: result.text]
}
//========================//
// REACT CALLBACK FUNCTION
//========================//
- (void) sendVinCode: (NSString *)code {
if (!self.onCaptureVin) {
return;
}
self.onCaptureVin(#{#"vin": code});
}
- (void) cancelVinScan {
if (!self.onClose) {
return;
}
self.onClose(#{});
}
- (void) requestManualVinEntry {
if (!self.onEnterVinManuallyPress) {
return;
}
self.onEnterVinManuallyPress(#{});
}
//================//
// BUTTON HANDLERS
//================//
- (void) manualVinEntryButtonHandler:(UIButton *)button {
[self requestManualVinEntry];
}
- (void) cancelButtonHandler:(UIButton *)button {
[self cancelVinScan];
}
//==========//
// CUSTOM UI
//==========//
- (void) createHeader {
UIView *headerContainer = [[UIView alloc] init];
headerContainer.translatesAutoresizingMaskIntoConstraints = NO;
[headerContainer setBackgroundColor: [UIColor colorWithWhite:1 alpha:0.7]];
UILabel *scanVinMessage = [[UILabel alloc] initWithFrame:CGRectMake(22.2, 18.0, 183.5, 21)];
[scanVinMessage setText:#"Scan VIN"];
[scanVinMessage setTextAlignment:NSTextAlignmentCenter];
[scanVinMessage setTextColor:[UIColor darkGrayColor]];
[scanVinMessage setBackgroundColor:[UIColor clearColor]];
[scanVinMessage setFont:[UIFont systemFontOfSize:17]];
[scanVinMessage setCenter:CGPointMake(self.frame.size.width / 2, 27.5)];
[headerContainer addSubview:scanVinMessage];
[self addSubview:headerContainer];
// [headerContainer.leadingAnchor constraintEqualToAnchor:self.leadingAnchor constant:0.0].active = YES;
// [headerContainer.trailingAnchor constraintEqualToAnchor:self.trailingAnchor constant:0.0].active = YES;
// [headerContainer.heightAnchor constraintEqualToConstant:55.0].active = YES;
}
- (void) createTarget {
UIView *scanLine = [[UIView alloc] init];
scanLine.translatesAutoresizingMaskIntoConstraints = NO;
[scanLine setBackgroundColor:[UIColor redColor]];
[self addSubview:scanLine];
// [scanLine.centerYAnchor constraintEqualToAnchor:self.centerYAnchor].active = YES;
// [scanLine.leadingAnchor constraintEqualToAnchor:self.leadingAnchor constant:25.0].active = YES;
// [scanLine.trailingAnchor constraintEqualToAnchor:self.trailingAnchor constant:-25.0].active = YES;
// [scanLine.heightAnchor constraintEqualToConstant:4.0].active = YES;
UIView *topLeftTop = [[UIView alloc] init];
topLeftTop.translatesAutoresizingMaskIntoConstraints = NO;
[topLeftTop setBackgroundColor:[UIColor redColor]];
[self addSubview:topLeftTop];
// [topLeftTop.bottomAnchor constraintEqualToAnchor:self.centerYAnchor constant:-34.0].active = YES;
// [topLeftTop.leadingAnchor constraintEqualToAnchor:self.leadingAnchor constant:15.0].active = YES;
// [topLeftTop.heightAnchor constraintEqualToConstant:4.0].active = YES;
// [topLeftTop.widthAnchor constraintEqualToConstant:24.0].active = YES;
UIView *topLeftLeft = [[UIView alloc] init];
topLeftLeft.translatesAutoresizingMaskIntoConstraints = NO;
[topLeftLeft setBackgroundColor:[UIColor redColor]];
[self addSubview:topLeftLeft];
// [topLeftLeft.bottomAnchor constraintEqualToAnchor:self.centerYAnchor constant:-14.0].active = YES;
// [topLeftLeft.leadingAnchor constraintEqualToAnchor:self.leadingAnchor constant:15.0].active = YES;
// [topLeftLeft.heightAnchor constraintEqualToConstant:20.0].active = YES;
// [topLeftLeft.widthAnchor constraintEqualToConstant:4.0].active = YES;
UIView *topRightTop = [[UIView alloc] init];
topRightTop.translatesAutoresizingMaskIntoConstraints = NO;
[topRightTop setBackgroundColor:[UIColor redColor]];
[self addSubview:topRightTop];
// [topRightTop.bottomAnchor constraintEqualToAnchor:self.centerYAnchor constant:-34.0].active = YES;
// [topRightTop.trailingAnchor constraintEqualToAnchor:self.trailingAnchor constant:-15.0].active = YES;
// [topRightTop.heightAnchor constraintEqualToConstant:4.0].active = YES;
// [topRightTop.widthAnchor constraintEqualToConstant:24.0].active = YES;
UIView *topRightRight = [[UIView alloc] init];
topRightRight.translatesAutoresizingMaskIntoConstraints = NO;
[topRightRight setBackgroundColor:[UIColor redColor]];
[self addSubview:topRightRight];
// [topRightRight.bottomAnchor constraintEqualToAnchor:self.centerYAnchor constant:-14.0].active = YES;
// [topRightRight.trailingAnchor constraintEqualToAnchor:self.trailingAnchor constant:-15.0].active = YES;
// [topRightRight.heightAnchor constraintEqualToConstant:20.0].active = YES;
// [topRightRight.widthAnchor constraintEqualToConstant:4.0].active = YES;
UIView *bottomLeftBottom = [[UIView alloc] init];
bottomLeftBottom.translatesAutoresizingMaskIntoConstraints = NO;
[bottomLeftBottom setBackgroundColor:[UIColor redColor]];
[self addSubview:bottomLeftBottom];
// [bottomLeftBottom.topAnchor constraintEqualToAnchor:self.centerYAnchor constant:34.0].active = YES;
// [bottomLeftBottom.leadingAnchor constraintEqualToAnchor:self.leadingAnchor constant:15.0].active = YES;
// [bottomLeftBottom.heightAnchor constraintEqualToConstant:4.0].active = YES;
// [bottomLeftBottom.widthAnchor constraintEqualToConstant:24.0].active = YES;
UIView *bottomLeftLeft = [[UIView alloc] init];
bottomLeftLeft.translatesAutoresizingMaskIntoConstraints = NO;
[bottomLeftLeft setBackgroundColor:[UIColor redColor]];
[self addSubview:bottomLeftLeft];
// [bottomLeftLeft.topAnchor constraintEqualToAnchor:self.centerYAnchor constant:14.0].active = YES;
// [bottomLeftLeft.leadingAnchor constraintEqualToAnchor:self.leadingAnchor constant:15.0].active = YES;
// [bottomLeftLeft.heightAnchor constraintEqualToConstant:20.0].active = YES;
// [bottomLeftLeft.widthAnchor constraintEqualToConstant:4.0].active = YES;
UIView *bottomRightBottom = [[UIView alloc] init];
bottomRightBottom.translatesAutoresizingMaskIntoConstraints = NO;
[bottomRightBottom setBackgroundColor:[UIColor redColor]];
[self addSubview:bottomRightBottom];
// [bottomRightBottom.topAnchor constraintEqualToAnchor:self.centerYAnchor constant:34.0].active = YES;
// [bottomRightBottom.trailingAnchor constraintEqualToAnchor:self.trailingAnchor constant:-15.0].active = YES;
// [bottomRightBottom.heightAnchor constraintEqualToConstant:4.0].active = YES;
// [bottomRightBottom.widthAnchor constraintEqualToConstant:24.0].active = YES;
UIView *bottomRightRight = [[UIView alloc] init];
bottomRightRight.translatesAutoresizingMaskIntoConstraints = NO;
[bottomRightRight setBackgroundColor:[UIColor redColor]];
[self addSubview:bottomRightRight];
// [bottomRightRight.topAnchor constraintEqualToAnchor:self.centerYAnchor constant:14.0].active = YES;
// [bottomRightRight.trailingAnchor constraintEqualToAnchor:self.trailingAnchor constant:-15.0].active = YES;
// [bottomRightRight.heightAnchor constraintEqualToConstant:24.0].active = YES;
// [bottomRightRight.widthAnchor constraintEqualToConstant:4.0].active = YES;
}
- (void) createCancelButton {
CGFloat screenHeight = [[UIScreen mainScreen] bounds].size.height;
CGFloat screenWidth = [[UIScreen mainScreen] bounds].size.width;
UIButton *cancelButton = [[UIButton alloc] init];
[cancelButton addTarget:self action:#selector(cancelButtonHandler:) forControlEvents:UIControlEventTouchUpInside];
float buttonSize = 43.0;
float margin = 20.0;
[cancelButton setFrame:CGRectMake(screenWidth - buttonSize - margin, screenHeight - buttonSize - margin, buttonSize, buttonSize)];
[cancelButton setBackgroundImage:[UIImage imageNamed:#"vin-scan-cancel"]
forState:UIControlStateNormal];
[self addSubview:cancelButton];
}
- (void) createManualVinEntryButton {
CGFloat screenHeight = [[UIScreen mainScreen] bounds].size.height;
UIButton *manualVinEntryButton = [[UIButton alloc] init];
[manualVinEntryButton addTarget:self action:#selector(manualVinEntryButtonHandler:) forControlEvents:UIControlEventTouchUpInside];
[manualVinEntryButton setTitle:#"Enter VIN Manually" forState:UIControlStateNormal];
[manualVinEntryButton sizeToFit];
float buttonHeight = 43.0;
float margin = 20.0;
[manualVinEntryButton setFrame:CGRectMake(margin, screenHeight - buttonHeight - margin, 200, buttonHeight)];
[manualVinEntryButton setTitleColor:[UIColor darkGrayColor] forState:UIControlStateNormal];
[[manualVinEntryButton layer] setCornerRadius:21];
[[manualVinEntryButton layer]setBackgroundColor: [[UIColor colorWithWhite:1 alpha:.7] CGColor]];
[self addSubview:manualVinEntryButton];
}
//========//
// UTILITY
//========//
- (BOOL) isIphoneX {
struct utsname systemInfo;
uname(&systemInfo);
NSString* deviceModel = [NSString stringWithCString:systemInfo.machine
encoding:NSUTF8StringEncoding];
return [deviceModel isEqualToString:#"iPhone10,3"] ||
[deviceModel isEqualToString:#"iPhone10,6"] ||
[deviceModel isEqualToString:#"iPhone11,2"] ||
[deviceModel isEqualToString:#"iPhone11,8"] ||
[deviceModel isEqualToString:#"iPhone11,4"] ||
[deviceModel isEqualToString:#"iPhone12,1"] ||
[deviceModel isEqualToString:#"iPhone12,3"] ||
[deviceModel isEqualToString:#"iPhone12,5"] ||
[deviceModel isEqualToString:#"iPad8,5"];
};
- (void)applyOrientation {
UIInterfaceOrientation orientation = [[UIApplication sharedApplication] statusBarOrientation];
float scanRectRotation;
float captureRotation;
switch (orientation) {
case UIInterfaceOrientationPortrait:
captureRotation = 0;
scanRectRotation = 90;
break;
case UIInterfaceOrientationLandscapeLeft:
captureRotation = 90;
scanRectRotation = 180;
break;
case UIInterfaceOrientationLandscapeRight:
captureRotation = 270;
scanRectRotation = 0;
break;
case UIInterfaceOrientationPortraitUpsideDown:
captureRotation = 180;
scanRectRotation = 270;
break;
default:
captureRotation = 0;
scanRectRotation = 90;
break;
}
self.scannerController.capture.layer.frame = self.frame;
CGAffineTransform transform = CGAffineTransformMakeRotation((CGFloat) (captureRotation / 180 * M_PI));
[self.scannerController.capture setTransform:transform];
[self.scannerController.capture setRotation:scanRectRotation];
[self.scannerController applyRectOfInterest:orientation];
}
#end
MyViewController.h
#import <UIKit/UIViewController.h>
#import <ZXingObjC/ZXingObjC.h>
#interface MyViewController: UIViewController
#property (nonatomic, strong) ZXCapture *capture;
#property (nonatomic, weak) IBOutlet UIView *scanRectView;
#property (nonatomic, weak) IBOutlet UILabel *decodedLabel;
#property (nonatomic) BOOL scanning;
#property (nonatomic) BOOL isFirstApplyOrientation;
#property (nonatomic) CGAffineTransform _captureSizeTransform;
- (void)applyRectOfInterest:(UIInterfaceOrientation)orientation;
#end
MyViewController.m
#import "MyViewController.h"
#interface MyViewController()
#end
#implementation MyViewController
//===============//
// INITIALIZE SDK
//===============//
- (instancetype)init {
self = [super init];
if (self) {
// Custom initialization
self.capture = [[ZXCapture alloc] init];
self.capture.sessionPreset = AVCaptureSessionPreset1920x1080;
self.capture.camera = self.capture.back;
self.capture.focusMode = AVCaptureFocusModeContinuousAutoFocus;
self.scanning = NO;
}
return self;
}
- (void)viewDidLoad {
[super viewDidLoad];
// self.capture = [[ZXCapture alloc] init];
// self.capture.sessionPreset = AVCaptureSessionPreset1920x1080;
// self.capture.camera = self.capture.back;
// self.capture.focusMode = AVCaptureFocusModeContinuousAutoFocus;
// self.scanning = YES;
// [self.capture start];
[self.view.layer addSublayer:self.capture.layer];
// [self.view bringSubviewToFront:self.scanRectView];
}
- (void)viewDidLayoutSubviews {
[super viewDidLayoutSubviews];
if (self.isFirstApplyOrientation) return;
self.isFirstApplyOrientation = YES;
[self applyOrientation];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
}
//========//
// CLEANUP
//========//
- (void)dealloc {
[self.capture.layer removeFromSuperlayer];
}
//=======================//
// ROTATION AND TRANSFORM
//=======================//
- (UIInterfaceOrientationMask)supportedInterfaceOrientations {
return UIInterfaceOrientationMaskAll;
}
- (BOOL)shouldAutorotate {
return YES;
}
- (void)applyRectOfInterest:(UIInterfaceOrientation)orientation {
CGFloat scaleVideoX, scaleVideoY;
CGFloat videoSizeX, videoSizeY;
CGRect transformedVideoRect = self.scanRectView.frame;
if([self.capture.sessionPreset isEqualToString:AVCaptureSessionPreset1920x1080]) {
videoSizeX = 1080;
videoSizeY = 1920;
} else {
videoSizeX = 720;
videoSizeY = 1280;
}
if(UIInterfaceOrientationIsPortrait(orientation)) {
scaleVideoX = self.capture.layer.frame.size.width / videoSizeX;
scaleVideoY = self.capture.layer.frame.size.height / videoSizeY;
// Convert CGPoint under portrait mode to map with orientation of image
// because the image will be cropped before rotate
// reference: https://github.com/TheLevelUp/ZXingObjC/issues/222
CGFloat realX = transformedVideoRect.origin.y;
CGFloat realY = self.capture.layer.frame.size.width - transformedVideoRect.size.width - transformedVideoRect.origin.x;
CGFloat realWidth = transformedVideoRect.size.height;
CGFloat realHeight = transformedVideoRect.size.width;
transformedVideoRect = CGRectMake(realX, realY, realWidth, realHeight);
} else {
scaleVideoX = self.capture.layer.frame.size.width / videoSizeY;
scaleVideoY = self.capture.layer.frame.size.height / videoSizeX;
}
// _captureSizeTransform = CGAffineTransformMakeScale(1.0/scaleVideoX, 1.0/scaleVideoY);
self.capture.scanRect = CGRectApplyAffineTransform(transformedVideoRect, CGAffineTransformMakeScale(1.0/scaleVideoX, 1.0/scaleVideoY));
}
//========//
// UTILITY
//========//
- (NSString *)barcodeFormatToString:(ZXBarcodeFormat)format {
switch (format) {
case kBarcodeFormatAztec:
return #"Aztec";
case kBarcodeFormatCodabar:
return #"CODABAR";
case kBarcodeFormatCode39:
return #"Code 39";
case kBarcodeFormatCode93:
return #"Code 93";
case kBarcodeFormatCode128:
return #"Code 128";
case kBarcodeFormatDataMatrix:
return #"Data Matrix";
case kBarcodeFormatEan8:
return #"EAN-8";
case kBarcodeFormatEan13:
return #"EAN-13";
case kBarcodeFormatITF:
return #"ITF";
case kBarcodeFormatPDF417:
return #"PDF417";
case kBarcodeFormatQRCode:
return #"QR Code";
case kBarcodeFormatRSS14:
return #"RSS 14";
case kBarcodeFormatRSSExpanded:
return #"RSS Expanded";
case kBarcodeFormatUPCA:
return #"UPCA";
case kBarcodeFormatUPCE:
return #"UPCE";
case kBarcodeFormatUPCEANExtension:
return #"UPC/EAN extension";
default:
return #"Unknown";
}
}
- (void)captureCameraIsReady:(ZXCapture *)capture {
self.scanning = YES;
}
- (void)applyOrientation {
UIInterfaceOrientation orientation = [[UIApplication sharedApplication] statusBarOrientation];
float scanRectRotation;
float captureRotation;
switch (orientation) {
case UIInterfaceOrientationPortrait:
captureRotation = 0;
scanRectRotation = 90;
break;
case UIInterfaceOrientationLandscapeLeft:
captureRotation = 90;
scanRectRotation = 180;
break;
case UIInterfaceOrientationLandscapeRight:
captureRotation = 270;
scanRectRotation = 0;
break;
case UIInterfaceOrientationPortraitUpsideDown:
captureRotation = 180;
scanRectRotation = 270;
break;
default:
captureRotation = 0;
scanRectRotation = 90;
break;
}
self.capture.layer.frame = self.view.frame;
CGAffineTransform transform = CGAffineTransformMakeRotation((CGFloat) (captureRotation / 180 * M_PI));
[self.capture setTransform:transform];
[self.capture setRotation:scanRectRotation];
[self applyRectOfInterest:orientation];
}
#end