flutter_barcode_reader/ios/Classes/BarcodeScannerViewController.m

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//
// Created by Matthew Smith on 11/7/17.
//
#import "BarcodeScannerViewController.h"
#import <MTBBarcodeScanner/MTBBarcodeScanner.h>
#import "ScannerOverlay.h"
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@implementation BarcodeScannerViewController {
}
- (void)viewWillTransitionToSize:(CGSize)size withTransitionCoordinator:(id<UIViewControllerTransitionCoordinator>)coordinator
{
CGRect bounds = [UIScreen mainScreen].bounds;
CGRect reversedBounds = CGRectMake(bounds.origin.x, bounds.origin.y, bounds.size.height, bounds.size.width);
self.previewView.bounds = reversedBounds;
self.previewView.frame = reversedBounds;
[self.scanRect removeFromSuperview];
[self setupScanRect:reversedBounds];
[super viewWillTransitionToSize:size withTransitionCoordinator:coordinator];
}
- (void)setupScanRect:(CGRect)bounds {
self.scanRect = [[ScannerOverlay alloc] initWithFrame:bounds];
self.scanRect.translatesAutoresizingMaskIntoConstraints = NO;
self.scanRect.backgroundColor = UIColor.clearColor;
[self.view addSubview:_scanRect];
[self.view addConstraints:[NSLayoutConstraint
constraintsWithVisualFormat:@"V:[scanRect]"
options:NSLayoutFormatAlignAllBottom
metrics:nil
views:@{@"scanRect": _scanRect}]];
[self.view addConstraints:[NSLayoutConstraint
constraintsWithVisualFormat:@"H:[scanRect]"
options:NSLayoutFormatAlignAllBottom
metrics:nil
views:@{@"scanRect": _scanRect}]];
[_scanRect startAnimating];
}
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- (void)viewDidLoad {
[super viewDidLoad];
self.previewView = [[UIView alloc] initWithFrame:self.view.bounds];
self.previewView.translatesAutoresizingMaskIntoConstraints = NO;
[self.view addSubview:_previewView];
[self.view addConstraints:[NSLayoutConstraint
constraintsWithVisualFormat:@"V:[previewView]"
options:NSLayoutFormatAlignAllBottom
metrics:nil
views:@{@"previewView": _previewView}]];
[self.view addConstraints:[NSLayoutConstraint
constraintsWithVisualFormat:@"H:[previewView]"
options:NSLayoutFormatAlignAllBottom
metrics:nil
views:@{@"previewView": _previewView}]];
[self setupScanRect:self.view.bounds];
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self.scanner = [[MTBBarcodeScanner alloc] initWithPreviewView:_previewView];
self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemCancel target:self action:@selector(cancel)];
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[self updateFlashButton];
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}
- (void)viewDidAppear:(BOOL)animated {
[super viewDidAppear:animated];
if (self.scanner.isScanning) {
[self.scanner stopScanning];
}
[MTBBarcodeScanner requestCameraPermissionWithSuccess:^(BOOL success) {
if (success) {
[self startScan];
} else {
[self.delegate barcodeScannerViewController:self didFailWithErrorCode:@"PERMISSION_NOT_GRANTED"];
[self dismissViewControllerAnimated:NO completion:nil];
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}
}];
}
- (void)viewWillDisappear:(BOOL)animated {
[self.scanner stopScanning];
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[super viewWillDisappear:animated];
if ([self isFlashOn]) {
[self toggleFlash:NO];
}
}
- (void)startScan {
NSError *error;
[self.scanner startScanningWithResultBlock:^(NSArray<AVMetadataMachineReadableCodeObject *> *codes) {
[self.scanner stopScanning];
AVMetadataMachineReadableCodeObject *code = codes.firstObject;
if (code) {
[self.delegate barcodeScannerViewController:self didScanBarcodeWithResult:code.stringValue];
[self dismissViewControllerAnimated:NO completion:nil];
}
} error:&error];
}
- (void)cancel {
[self.delegate barcodeScannerViewController:self didFailWithErrorCode:@"USER_CANCELED"];
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[self dismissViewControllerAnimated:true completion:nil];
}
- (void)updateFlashButton {
if (!self.hasTorch) {
return;
}
if (self.isFlashOn) {
self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"Flash Off"
style:UIBarButtonItemStylePlain
target:self action:@selector(toggle)];
} else {
self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"Flash On"
style:UIBarButtonItemStylePlain
target:self action:@selector(toggle)];
}
}
- (void)toggle {
[self toggleFlash:!self.isFlashOn];
[self updateFlashButton];
}
- (BOOL)isFlashOn {
AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
if (device) {
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return device.torchMode == AVCaptureFlashModeOn || device.torchMode == AVCaptureTorchModeOn;
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}
return NO;
}
- (BOOL)hasTorch {
AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
if (device) {
return device.hasTorch;
}
return false;
}
- (void)toggleFlash:(BOOL)on {
AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
if (!device) return;
NSError *err;
if (device.hasFlash && device.hasTorch) {
[device lockForConfiguration:&err];
if (err != nil) return;
if (on) {
device.flashMode = AVCaptureFlashModeOn;
device.torchMode = AVCaptureTorchModeOn;
} else {
device.flashMode = AVCaptureFlashModeOff;
device.torchMode = AVCaptureTorchModeOff;
}
[device unlockForConfiguration];
}
}
@end