Getting Started with iOS

System Requirements
Build Your First Application

System Requirements

Supported OS: iOS 11 or higher (iOS 13 and higher recommended).
Supported ABI: arm64 and x86_64.
Development Environment: Xcode 13 and above (Xcode 14.1+ recommended).

Build Your First Application

This guide will walk you through the process of creating a HelloWorld app for normalizing documents via a camera video input.

Note:

Xcode 14.0 is used in this guide.

You can get the source code of the HelloWord app from the following link

Objective-C.

Swift.

Create a New Project

Open Xcode and select create a new project.
Select iOS -> App for your application.
Input your product name (HelloWorld), interface (StoryBoard) and language (Objective-C/Swift).
Click on the Next button and select the location to save the project.
Click on the Create button to finish.

Add the SDK

There are three ways to add the SDK into your project - Manually, via CocoaPods, or via Swift Package Manager.

Add the Frameworks Manually

Download the SDK package from the Dynamsoft website. After unzipping, you can find the following xcframeworks under the Dynamsoft\Frameworks directory:

File	Description
`DynamsoftDocumentNormalizer.xcframework`	The Dynamsoft Document Normalizer SDK which includes the document normalizer related APIs.
`DynamsoftCore.xcframework`	The core library of the Dynamsoft Capture Vision SDK which includes basic structures and intermediate result related APIs.
`DynamsoftCaptureVisionRouter.xcframework`	The CaptureVisionRouter is used to coordinate the image-processing and semantic-processing products that are being used in the application. It accepts an image source and returns processing results which may contain final results or intermediate results.
`DynamsoftImageProcessing.xcframework`	The image processing library of the Dynamsoft Capture Vision SDK, and so includes the image processing algorithms and APIs.
`DynamsoftLicense.xcframework`	This module includes the licensing API.
`DynamsoftCameraEnhancer.xcframework`	The Dynamsoft Camera Enhancer SDK defines the camera control and frame preprocessing API.
`DynamsoftUtility.xcframework (Optional)`	The module includes functional APIs that support you to integrate the input, filtering the results, generating result images, etc.

Drag and drop the above six (seven if the Utility framework is included) xcframeworks into your Xcode project. Make sure to check Copy items if needed and Create groups to properly copy the framework into your project’s folder.
Click on the project settings then go to General –> Frameworks, Libraries, and Embedded Content. Set the Embed field to Embed & Sign for all included xcframeworks.

Add the Frameworks via CocoaPods

Add the frameworks in your Podfile.

target 'HelloWorld' do
   use_frameworks!

pod 'DynamsoftDocumentNormalizerBundle','2.2.11'

end

Execute the pod command to install the frameworks and generate workspace(HelloWorld.xcworkspace):
```
pod install
```

Add the xcframeworks via Swift Package Manager

In your Xcode project, go to File –> AddPackages.
In the top-right section of the window, search “https://github.com/Dynamsoft/document-normalizer-spm”
Select document-normalizer-spm, then click Add Package.
Check all the frameworks and add.

Initialize License

Initialize the license first. It is suggested to initialize the license in AppDelegate file.

Objective-C
Swift

// Import the DynamsoftLicense module to init license
#import <DynamsoftLicense/DynamsoftLicense.h>
// Add LicenseVerificationListener to the interface
@interface AppDelegate ()<LicenseVerificationListener>
@end
@implementation AppDelegate
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
   // Override point for customization after application launch.
   [DSLicenseManager initLicense:@"Put your" verificationDelegate:self];
   return YES;
}
-(void)onLicenseVerified:(BOOL)isSuccess error:(NSError *)error
{
   // Add your code to do when license server returns.
}
...
@end

// Import the DynamsoftLicense module to init license
import DynamsoftLicense
// Add LicenseVerificationListener to the interface
class AppDelegate: UIResponder, UIApplicationDelegate, LicenseVerificationListener {
   var window: UIWindow?
   func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
      // Override point for customization after application launch.
      LicenseManager.initLicense("Put your license key here.", verificationDelegate: self)
      return true
   }
   // Implement the callback method of LicenseVerificationListener.
   func onLicenseVerified(_ isSuccess: Bool, error: Error?) {
      // Add your code to do when license server returns.
   }
   ...
}

Note:

Network connection is required for the license to work.

The license string here will grant you a time-limited trial license.

If the license has expired, you can go to the customer portal to request for an extension.

Main ViewController for Realtime Detection of Quads

In the main view controller, your app will scan documents via video streaming and display the detect quadrilateral area on the screen. First of all, import the headers in the ViewController file.

Objective-C
Swift

   #import <DynamsoftCore/DynamsoftCore.h>
   #import <DynamsoftCaptureVisionRouter/DynamsoftCaptureVisionRouter.h>
   #import <DynamsoftDocumentNormalizer/DynamsoftDocumentNormalizer.h>
   #import <DynamsoftImageProcessing/DynamsoftImageProcessing.h>
   #import <DynamsoftCameraEnhancer/DynamsoftCameraEnhancer.h>

   import DynamsoftCore
   import DynamsoftCaptureVisionRouter
   import DynamsoftDocumentNormalizer
   import DynamsoftUtility
   import DynamsoftCameraEnhancer

Get Prepared with the Camera Module

Create the instances of CameraEnhancer and CameraView.

Objective-C
Swift

@property (nonatomic, strong) DSCameraEnhancer *dce;
@property (nonatomic, strong) DSCameraView *cameraView;
...
- (void)setUpCamera
{
   _cameraView = [[DSCameraView alloc] initWithFrame:self.view.bounds];
   [_cameraView setAutoresizingMask:UIViewAutoresizingFlexibleWidth];
   [self.view addSubview:_cameraView];
   [_cameraView addSubview:_captureButton];
   _dce = [[DSCameraEnhancer alloc] init];
   [_dce setCameraView:_cameraView];
   DSDrawingLayer * layer = [_cameraView getDrawingLayer:DSDrawingLayerIdDDN];
   [layer setVisible:true];
   // You can enable the frame filter feature of Dynamsoft Camera Enhancer.
   //[_dce enableEnhancedFeatures:DSEnhancerFeatureFrameFilter];
}

var cameraView:CameraView!
let dce:CameraEnhancer!
...
func setUpCamera() {
   // Create a camera view and add it as a sub view of the current view.
   cameraView = .init(frame: view.bounds)
   cameraView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
   view.insertSubview(cameraView, at: 0)
   // Bind the camera enhancer with the camera view.
   dce = CameraEnhancer()
   dce.cameraView = cameraView
   // Additional step: Highlight the detected document boundary.
   let layer = cameraView.getDrawingLayer(DrawingLayerId.DDN.rawValue)
   layer?.visible = true
   // You can enable the frame filter feature of Dynamsoft Camera Enhancer.
   // dce.enableEnhancedFeatures(.frameFilter)
}

Initialize Capture Vision Router

Once the camera component is set up, declare and create an instance of CaptureVisionRouter and set its input to the Camera Enhancer object you created in the last step.

Objective-C
Swift

@property (nonatomic, strong) DSCaptureVisionRouter *cvr;
...
- (void)setUpCvr
{
   _cvr = [[DSCaptureVisionRouter alloc] init];
}

let cvr:CaptureVisionRouter!
func setUpDCV() {
   cvr = CaptureVisionRouter()
}

Bind your CaptureVisionRouter instance with the created CameraEnhancer instance.

Objective-C
Swift

- (void)setUpCvr
{
   ...
   NSError *cvrError;
   [_cvr setInput:_dce error:&cvrError];
}

func setUpCvr() {
   try? cvr.setInput(dce)
}

Set up Result Receiver

Add CapturedResultReceiver to your ViewController.

Objective-C
Swift

@interface ViewController ()<DSCapturedResultReceiver>

class ViewController: UIViewController, CapturedResultReceiver {
   ...
}

Implement onNormalizedImagesReceived method to receive the normalized images as the captured results.

Objective-C
Swift

-(void)onNormalizedImagesReceived:(DSNormalizedImagesResult *)result
{
   if (_implementCapture && result!=nil && result.items[0].imageData!=nil)
   {
      _implementCapture = false;
      ImageViewController *imageViewController = [[ImageViewController alloc] init];
      NSError * error;
      imageViewController.resultUIImage = [result.items[0].imageData toUIImage:&error];
      dispatch_async(dispatch_get_main_queue(), ^{            [self.navigationController pushViewController:imageViewController animated:YES];
      });
   }
}

func onNormalizedImagesReceived(_ result: NormalizedImagesResult) {
   print("Normalized image received")
   if let items = result.items, items.count > 0 {
      guard let data = items[0].imageData else {
         return
      }
      let resultView = ImageViewController()
      resultView.data = data
      if implementCapture
      {
         DispatchQueue.main.async {
                self.present(resultView, animated: true)
         }
      }
   }
}

Add the result receiver to the CaptureVisionRouter.

Objective-C
Swift

- (void)setUpCvr
{
   ...
   NSError *cvrError;
   [_cvr addResultReceiver:self error:&cvrError];
   DSMultiFrameResultCrossFilter *filter = [[DSMultiFrameResultCrossFilter alloc] init];
   [filter enableResultCrossVerification:DSCapturedResultItemTypeNormalizedImage isEnabled:true];
   [_cvr addResultFilter:filter error:&cvrError];
}

func setUpCvr() {
   try? cvr.addResultReceiver(self)
   let filter = MultiFrameResultCrossFilter.init()
   filter.enableResultCrossVerification(.normalizedImage, isEnabled: true)
   try? cvr.addResultFilter(filter)
}

Add a confirmCapture button to confirm the result.

Objective-C
Swift

@property (nonatomic, strong) UIButton *captureButton;
...
- (void)addCaptureButton {
   [self.view addSubview:self.captureButton];
}
- (UIButton *)captureButton {
   NSLog(@"Start adding button");
   CGFloat screenWidth = [UIScreen mainScreen].bounds.size.width;
   CGFloat screenHeight = [UIScreen mainScreen].bounds.size.height;
   if (!_captureButton) {
      _captureButton = [UIButton buttonWithType:UIButtonTypeCustom];
      _captureButton.frame = CGRectMake((screenWidth - 150) / 2.0, screenHeight - 100, 150, 50);
      _captureButton.backgroundColor = [UIColor grayColor];
      _captureButton.layer.cornerRadius = 10;
      _captureButton.layer.borderColor = [UIColor darkGrayColor].CGColor;
      [_captureButton setTitle:@"Capture" forState:UIControlStateNormal];
      [_captureButton setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
      [_captureButton addTarget:self action:@selector(setCapture) forControlEvents:UIControlEventTouchUpInside];
   }
   return _captureButton;
}

var captureButton:UIButton!
var implementCapture:Bool = false
...
func addCaptureButton()
{
   let w = UIScreen.main.bounds.size.width
   let h = UIScreen.main.bounds.size.height
   let SafeAreaBottomHeight: CGFloat = UIApplication.shared.statusBarFrame.size.height > 20 ? 34 : 0
   let photoButton = UIButton(frame: CGRect(x: w / 2 - 60, y: h - 100 - SafeAreaBottomHeight, width: 120, height: 60))
   photoButton.setTitle("Capture", for: .normal)
   photoButton.backgroundColor = UIColor.green
   photoButton.addTarget(self, action: #selector(confirmCapture), for: .touchUpInside)
   DispatchQueue.main.async(execute: { [self] in
      view.addSubview(photoButton)
   })
}
@objc func confirmCapture()
{
   implementCapture = true
}

Configure the methods viewDidLoad, viewWillAppear, and viewWillDisappear

Objective-C
Swift

- (void)viewDidLoad {
   [super viewDidLoad];
   [self setUpCamera];
   [self setUpCvr];
   [self addCaptureButton];
}
- (void)viewWillAppear:(BOOL)animated
{
   [super viewWillAppear:animated];
   [_dce open];
   NSError *cvrError;
   [_cvr startCapturing:DSPresetTemplateDetectAndNormalizeDocument error:&cvrError];
}
- (void)viewWillDisappear:(BOOL)animated
{
   [super viewWillAppear:animated];
   [_dce close];
}

override func viewDidLoad() {
   super.viewDidLoad()
   setUpCamera()
   setUpCvr()
   addCaptureButton()
}
override func viewWillAppear(_ animated: Bool) {
   super.viewWillAppear(animated)
   dce.open()
   try? cvr.startCapturing(PresetTemplate.detectAndNormalizeDocument.rawValue)
}
override func viewWillDisappear(_ animated: Bool) {
   super.viewWillDisappear(animated)
   dce.close()
}

Display the Normalized Image

Create a new UIViewController class ImageViewController.
Add a property normalizedImage to the header file of ImageViewController (Objective-C only).
```
@property (nonatomic, strong) UIImage * normalizedImage;
```

Configure the ImageViewController to display the normalized image..

Objective-C
Swift

#import "ImageViewController.h"
#import <DynamsoftCameraEnhancer/DynamsoftCameraEnhancer.h>
@interface ImageViewController()
@property (nonatomic, strong) UIImageView *imageView;
@end
@implementation ImageViewController
-(void)viewDidLoad
{
   NSLog(@"ImageViewController loaded");
   [super viewDidLoad];
   [self setUpView];
}
- (void)setUpView
{
   _imageView = [[UIImageView alloc] initWithFrame:self.view.bounds];
   [self.view addSubview:_imageView];
   NSError *coreError;
   [_imageView setContentMode:UIViewContentModeScaleAspectFit];
   [_imageView setImage:self.normalizedImage];
}
@end

class ImageViewController: UIViewController{
   var normalizedImage:UIImage!
   var imageView:UIImageView!
   override func viewDidLoad() {
      super.viewDidLoad()
      setUpView()
   }
   func setUpView() {
      imageView = UIImageView.init(frame: view.bounds)
      imageView.contentMode = .scaleAspectFit
      view.addSubview(imageView)
      DispatchQueue.main.async { [self] in
         imageView.image = normalizedImage
      }
   }
}

Configure Camera Permissions

Add Privacy - Camera Usage Description to the info.plist of your project to request camera permission. An easy way to do this is to access your project settings, go to Info and then add this Privacy property to the iOS target properties list.

Additional Steps for iOS 12.x or Lower Versions

If your iOS version is 12.x or lower, please add the following additional steps:

Remove the methods application:didDiscardSceneSessions: and application:configurationForConnectingSceneSession:options: from your AppDelegate file.
Remove the SceneDelegate.Swift file (SceneDelegate.h & SceneDelegate.m for Objective-C).
Remove the Application Scene Manifest from your info.plist file.

Declaire the window in your AppDelegate.Swift file (AppDelegate.h for Objective-C).

Objective-C
Swift

@interface AppDelegate : UIResponder <UIApplicationDelegate>
@property (strong, nonatomic) UIWindow *window;
@end

import UIKit
@main
class AppDelegate: UIResponder, UIApplicationDelegate {
   var window: UIWindow?
}

Build and Run the Project

Select the device that you want to run your app on.
Run the project, then your app will be installed on your device.

Note:

You can get the source code of the HelloWord app from the following link

Objective-C.

Swift.