[ADD] Allow multiple metadata object types

QRCodeReaderViewController/QRCodeReaderViewController.h

@@ -52,10 +52,22 @@
  * @abstract Initializes a view controller to read QRCodes from a displayed 
  * video preview and a cancel button to be go back.
  * @param cancelTitle The title of the cancel button.
+ * @discussion This convenient method is used to instanciate a reader with
+ * only one supported metadata object types: the QRCode.
+ * @see initWithCancelButtonTitle:metadataObjectTypes:
  * @since 1.0.0
  */
 - (id)initWithCancelButtonTitle:(NSString *)cancelTitle;
 
+/**
+ * @abstract Initializes a view controller to read wanter metadata object 
+ * types from a displayed video preview and a cancel button to be go back.
+ * @param cancelTitle The title of the cancel button.
+ * @param metadataObjectTypes The type (“symbology”) of barcode to scan.
+ * @since 2.0.0
+ */
+- (id)initWithCancelButtonTitle:(NSString *)cancelTitle metadataObjectTypes:(NSArray *)metadataObjectTypes;
+
 /**
  * @abstract Creates a view controller to read QRCodes from a displayed
  * video preview and a cancel button to be go back.
@@ -65,15 +77,33 @@
  */
 + (instancetype)readerWithCancelButtonTitle:(NSString *)cancelTitle;
 
+/**
+ * @abstract Creates a view controller to read wanter metadata object types
+ * from a displayed video preview and a cancel button to be go back.
+ * @param cancelTitle The title of the cancel button.
+ * @param metadataObjectTypes The type (“symbology”) of barcode to scan.
+ * @since 2.0.0
+ */
++ (instancetype)readerWithCancelButtonTitle:(NSString *)cancelTitle metadataObjectTypes:(NSArray *)metadataObjectTypes;
+
 #pragma mark - Checking the Metadata Items Types
 /** @name Checking the Metadata Items Types */
 
 /**
  * @abstract Returns whether you can scan a QRCode with the current device.
- * @return a Boolean value indicating whether you can scan a QRCode with the current device.
+ * @return a Boolean value indicating whether you can scan a QRCode with the
+ * current device.
+ * @since 1.0.0
  */
 + (BOOL)isAvailable;
 
+/**
+ * @abstract An array of strings identifying the types of metadata objects to
+ * process.
+ * @since 2.0.0
+ */
+@property (strong, nonatomic, readonly) NSArray *metadataObjectTypes;
+
 #pragma mark - Managing the Block
 /** @name Managing the Block */
 

QRCodeReaderViewController/QRCodeReaderViewController.m

@@ -33,6 +33,7 @@ @interface QRCodeReaderViewController () <AVCaptureMetadataOutputObjectsDelegate
 @property (strong, nonatomic) QRCodeReaderView     *cameraView;
 @property (strong, nonatomic) UIButton             *cancelButton;
 
+@property (strong, nonatomic) NSArray                    *metadataObjectTypes;
 @property (strong, nonatomic) AVCaptureDevice            *defaultDevice;
 @property (strong, nonatomic) AVCaptureDeviceInput       *defaultDeviceInput;
 @property (strong, nonatomic) AVCaptureDevice            *frontDevice;
@@ -53,9 +54,15 @@ - (id)init
 }
 
 - (id)initWithCancelButtonTitle:(NSString *)cancelTitle
+{
+  return [self initWithCancelButtonTitle:cancelTitle metadataObjectTypes:@[AVMetadataObjectTypeQRCode]];
+}
+
+- (id)initWithCancelButtonTitle:(NSString *)cancelTitle metadataObjectTypes:(NSArray *)metadataObjectTypes
 {
   if ((self = [super init])) {
     self.view.backgroundColor = [UIColor blackColor];
+    self.metadataObjectTypes  = metadataObjectTypes;
 
     [self setupAVComponents];
     [self configureDefaultComponents];
@@ -72,6 +79,11 @@ + (instancetype)readerWithCancelButtonTitle:(NSString *)cancelTitle
   return [[self alloc] initWithCancelButtonTitle:cancelTitle];
 }
 
++ (instancetype)readerWithCancelButtonTitle:(NSString *)cancelTitle metadataObjectTypes:(NSArray *)metadataObjectTypes
+{
+  return [[self alloc] initWithCancelButtonTitle:cancelTitle metadataObjectTypes:metadataObjectTypes];
+}
+
 - (void)viewWillAppear:(BOOL)animated
 {
   [super viewWillAppear:animated];
@@ -208,9 +220,7 @@ - (void)configureDefaultComponents
   }
 
   [_metadataOutput setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];
-  if ([[_metadataOutput availableMetadataObjectTypes] containsObject:AVMetadataObjectTypeQRCode]) {
-    [_metadataOutput setMetadataObjectTypes:@[ AVMetadataObjectTypeQRCode ]];
-  }
+  [_metadataOutput setMetadataObjectTypes:_metadataObjectTypes];
   [_previewLayer setVideoGravity:AVLayerVideoGravityResizeAspectFill];
   [_previewLayer setFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height)];
 
@@ -276,7 +286,7 @@ - (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:
 {
   for(AVMetadataObject *current in metadataObjects) {
     if ([current isKindOfClass:[AVMetadataMachineReadableCodeObject class]]
-        && [current.type isEqualToString:AVMetadataObjectTypeQRCode]) {
+        && [_metadataObjectTypes containsObject:current.type]) {
       NSString *scannedResult = [(AVMetadataMachineReadableCodeObject *) current stringValue];
 
       if (_completionBlock) {