The QRCodeReaderViewController was initially a simple QRCode reader but it now lets you the possibility to specify the format type you want to decode. It is based on the AVFoundation framework from Apple in order to replace ZXing or ZBar for iOS 7 and over.
It provides a default view controller to display the camera view with the scan area overlay and it also provides a button to switch between the front and the back cameras.
Note that in iOS10+, you will need first to reasoning about the camera use. For that you'll need to add the Privacy - Camera Usage Description (NSCameraUsageDescription) field in your Info.plist:
Now a very simple example how to work with QRCodeReaderViewController:
// Create the reader object
QRCodeReader *reader = [QRCodeReader readerWithMetadataObjectTypes:@[AVMetadataObjectTypeQRCode]];
// Instantiate the view controller
QRCodeReaderViewController *vc = [QRCodeReaderViewController readerWithCancelButtonTitle:@"Cancel" codeReader:_reader startScanningAtLoad:YES showSwitchCameraButton:YES showTorchButton:YES];
// Set the presentation style
_vc.modalPresentationStyle = UIModalPresentationFormSheet;
// Define the delegate receiver
_vc.delegate = self;
// Or use blocks
[_reader setCompletionWithBlock:^(NSString *resultAsString) {
NSLog(@"%@", resultAsString);
}];Now when we touch the scan button we need to display the QRCodeReaderViewController:
#pragma mark - Action Methods
- (IBAction)scanAction:(id)sender
{
[self presentViewController:_vc animated:YES completion:NULL];
}And here the delegate methods:
#pragma mark - QRCodeReader Delegate Methods
- (void)reader:(QRCodeReaderViewController *)reader didScanResult:(NSString *)result
{
[self dismissViewControllerAnimated:YES completion:^{
NSLog(@"%@", result);
}];
}
- (void)readerDidCancel:(QRCodeReaderViewController *)reader
{
[self dismissViewControllerAnimated:YES completion:NULL];
}Note that you should check whether the device supports the reader library by using the [QRCodeReader isAvailable] or the [QRCodeReader supportsMetadataObjectTypes:nil] methods.
The recommended approach to use QRCodeReaderViewController in your project is using the CocoaPods package manager, as it provides flexible dependency management and dead simple installation.
Install CocoaPods if not already available:
$ [sudo] gem install cocoapods
$ pod setupGo to the directory of your Xcode project, and Create and Edit your Podfile and add QRCodeReaderViewController:
$ cd /path/to/MyProject
$ touch Podfile
$ edit Podfile
source 'https://github.com/CocoaPods/Specs.git'
platform :ios, '7.0'
pod 'QRCodeReaderViewController', '~> 4.0.2'Install into your project:
$ pod installOpen your project in Xcode from the .xcworkspace file (not the usual project file)
$ open MyProject.xcworkspaceDownload the project and copy the QRCodeReaderViewController folder into your project and then simply #import "QRCodeReaderViewController.h" in the file(s) you would like to use it in.
Yannick Loriot
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