_metadataObjectTypes is staying nil and crash app.

[humbertosales]

Yannick,

I has one problem and make some adjusts (workaround).
Please, see.

The _metadataObjectTypes is always nil.
QRCodeReader.m

- (id)init
{
  if ((self = [super init])) {
    _metadataObjectTypes = @[AVMetadataObjectTypeQRCode]; //not work. _metadataObjectTypes  will continue nil

    [self setupAVComponents];
    [self configureDefaultComponents];
  }
  return self;
}

- (id)initWithMetadataObjectTypes:(NSArray *)metadataObjectTypes
{
  if ((self = [super init])) {
    self.metadataObjectTypes = metadataObjectTypes; //not work. _metadataObjectTypes  will continue nil.

    [self setupAVComponents];
    [self configureDefaultComponents];
  }
  return self;
}

Workaround:
QRCodeReader.m

@interface QRCodeReader () <AVCaptureMetadataOutputObjectsDelegate>
@property (strong, nonatomic) AVCaptureDevice            *defaultDevice;
@property (strong, nonatomic) AVCaptureDeviceInput       *defaultDeviceInput;
@property (strong, nonatomic) AVCaptureDevice            *frontDevice;
@property (strong, nonatomic) AVCaptureDeviceInput       *frontDeviceInput;
@property (strong, nonatomic) AVCaptureMetadataOutput    *metadataOutput;
@property (strong, nonatomic) AVCaptureSession           *session;
@property (strong, nonatomic) AVCaptureVideoPreviewLayer *previewLayer;

@property (strong, nonatomic) NSArray *metadataObjectTypes; //ADDED

And replace all _ metadataObjectTypes for self. metadataObjectTypes in QRCodeReader.m.

Now it works!

[yannickl]

@humbertosales Thank you for the hint. I'll investigate that when I'll have some time.