AilaCaptureView

UIView that provides a user interface with camera feed and UI elements.

Declaration

Objective-C

@interface AilaCaptureView : UIView
@property (nonatomic) AVLayerVideoGravity videoGravity;
- (void)resetGuidanceText;
- (void)reconnectAVCaptureSession;
- (void)displayMRZGuides:(BOOL)shouldShow;
@end

Swift

class AilaCaptureView : UIView {
    var videoGravity: AVLayerVideoGravity
    func resetGuidanceText()
    func reconnectAVCaptureSession()
    func displayMRZGuides(_ shouldShow: Bool)
}

Description

This UIView subclass can be added to provide a user interface that includes the camera feed and UI elements to assist with MRZ scanning. It automatically manages the camera preview layer and provides guidance overlays.

Properties

videoGravity

Controls the videoGravity setting of the camera displayed in the view.

Type: AVLayerVideoGravity Default: AVLayerVideoGravityResizeAspect

Common values:

• AVLayerVideoGravityResizeAspect - Preserve aspect ratio, fit within bounds
• AVLayerVideoGravityResizeAspectFill - Preserve aspect ratio, fill bounds
• AVLayerVideoGravityResize - Stretch to fill bounds

Methods

resetGuidanceText

Manually hides the MRZ guidance text in the center of the AilaCaptureView for a period of 5 seconds.

Objective-C

- (void)resetGuidanceText;

Swift

func resetGuidanceText()

It is recommended to invoke this whenever the AilaCaptureView is displayed to the user.

displayMRZGuides

Shows or hides the MRZ guidance UI in the AilaCaptureView.

Objective-C

- (void)displayMRZGuides:(BOOL)shouldShow;

Swift

func displayMRZGuides(_ shouldShow: Bool)

Parameters:

• shouldShow - YES/true to show guides, NO/false to hide

Default: false

This allows the AilaCaptureView to be used for barcode or MRZ scanning.

reconnectAVCaptureSession

Reconnects the AVCaptureSession to the view.

Objective-C

- (void)reconnectAVCaptureSession;

Swift

func reconnectAVCaptureSession()

Useful when the capture session needs to be reestablished.

Usage Example

Objective-C

#import <Aila/Aila.h>

@interface ViewController ()
@property (strong, nonatomic) AilaCaptureView *captureView;
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    // Create and configure capture view
    self.captureView = [[AilaCaptureView alloc] initWithFrame:self.view.bounds];
    self.captureView.videoGravity = AVLayerVideoGravityResizeAspectFill;

    // Enable MRZ guides
    [self.captureView displayMRZGuides:YES];

    // Add to view hierarchy
    [self.view addSubview:self.captureView];

    // Configure SDK for MRZ
    AilaConfiguration *config = [[AilaConfiguration alloc] init];
    config.mrzMode = AilaMRZModeOn;
    Aila_SetConfiguration(config);
}

- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];

    // Reset guidance when view appears
    [self.captureView resetGuidanceText];
}

@end

Swift

import UIKit
import Aila

class ViewController: UIViewController {

    private var captureView: AilaCaptureView!

    override func viewDidLoad() {
        super.viewDidLoad()

        // Create and configure capture view
        captureView = AilaCaptureView(frame: view.bounds)
        captureView.videoGravity = .resizeAspectFill

        // Enable MRZ guides
        captureView.displayMRZGuides(true)

        // Add to view hierarchy
        view.addSubview(captureView)

        // Configure SDK for MRZ
        let config = AilaConfiguration()
        config.mrzMode = .on
        Aila_SetConfiguration(config)
    }

    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)

        // Reset guidance when view appears
        captureView.resetGuidanceText()
    }
}

See Also

• Aila_GetAVCaptureSession - Get AVCaptureSession reference
• AilaMRZMode - Enable MRZ scanning
• Getting Started - MRZ scanning example