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Use guard statements to reduce nesting

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This commit is contained in:
Danny Moesch 2020-08-19 19:51:09 +02:00 • committed by Mingshen Sun
parent ddabe206ab
commit edd7398cd4
4 changed files with 58 additions and 56 deletions
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82
pass/Controllers/QRScannerController.swift
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@ -86,61 +86,63 @@ class QRScannerController: UIViewController, AVCaptureMetadataOutputObjectsDeleg
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
// MARK: - AVCaptureMetadataOutputObjectsDelegate Methods
func metadataOutput(_: AVCaptureMetadataOutput, didOutput metadataObjects: [AVMetadataObject], from _: AVCaptureConnection) {
if let metadataObj = metadataObjects.first as? AVMetadataMachineReadableCodeObject,
supportedCodeTypes.contains(metadataObj.type),
let barCodeObject = videoPreviewLayer?.transformedMetadataObject(for: metadataObj) {
// draw a bounds on the found QR code
qrCodeFrameView?.frame = barCodeObject.bounds
guard let metadataObj = metadataObjects.first as? AVMetadataMachineReadableCodeObject else {
return setNotDetected()
}
guard supportedCodeTypes.contains(metadataObj.type) else {
return setNotDetected()
}
guard let barCodeObject = videoPreviewLayer?.transformedMetadataObject(for: metadataObj) else {
return setNotDetected()
}
// check whether it is a valid result
if let scanned = metadataObj.stringValue {
if let (accept, message) = delegate?.checkScannedOutput(line: scanned) {
scannerOutput.text = message
if accept == true {
captureSession?.stopRunning()
delegate?.handleScannedOutput(line: scanned)
DispatchQueue.main.async {
SVProgressHUD.showSuccess(withStatus: "Done".localize())
SVProgressHUD.dismiss(withDelay: 1)
self.navigationController?.popViewController(animated: true)
}
}
} else {
// no delegate, show the scanned result
scannerOutput.text = scanned
}
} else {
scannerOutput.text = "NoStringValue".localize()
}
} else {
qrCodeFrameView?.frame = CGRect.zero
scannerOutput.text = "NoQrCodeDetected.".localize()
// draw a bounds on the found QR code
qrCodeFrameView?.frame = barCodeObject.bounds
// check whether it is a valid result
guard let scanned = metadataObj.stringValue else {
scannerOutput.text = "NoStringValue".localize()
return
}
guard let (accept, message) = delegate?.checkScannedOutput(line: scanned) else {
// no delegate, show the scanned result
scannerOutput.text = scanned
return
}
scannerOutput.text = message
guard accept else {
return
}
captureSession?.stopRunning()
delegate?.handleScannedOutput(line: scanned)
DispatchQueue.main.async {
SVProgressHUD.showSuccess(withStatus: "Done".localize())
SVProgressHUD.dismiss(withDelay: 1)
self.navigationController?.popViewController(animated: true)
}
}
func presentCameraSettings() {
private func setNotDetected() {
qrCodeFrameView?.frame = CGRect.zero
scannerOutput.text = "NoQrCodeDetected.".localize()
}
private func presentCameraSettings() {
let alertController = UIAlertController(
title: "Error".localize(),
message: "CameraAccessDenied.".localize() | "WarningToggleCameraPermissionsResetsApp.".localize(),
preferredStyle: .alert
)
alertController.addAction(UIAlertAction(title: "Cancel".localize(), style: .default))
alertController.addAction(
UIAlertAction(title: "Settings".localize(), style: .cancel) { _ in
if let url = URL(string: UIApplication.openSettingsURLString) {
UIApplication.shared.open(url, options: [:]) { _ in }
}
alertController.addAction(UIAlertAction(title: "Settings".localize(), style: .cancel) { _ in
if let url = URL(string: UIApplication.openSettingsURLString) {
UIApplication.shared.open(url)
}
}
)
present(alertController, animated: true)
}
}