ZBar SDK und Kamera funktioniert nicht richtig in iOS 8

Question

Ich habe meine App mit ZBar integriert. Es funktioniert tadellos in iOS 7.1 und darunter, aber in iOS 8.0-Geräten finde ich, dass die Kameraansicht zuerst in Schwarz gezeigt wird. Wenn ich die App jedoch in den Hintergrundzustand bringe und sie erneut an den Vordergrund sende, wenn die Kameraansicht geöffnet ist, funktioniert sie. Hat jemand das erlebt?

Dank

Answer 1

Wenn Sie nur QR-Code Scannen benötigen, ist es viel einfacher ist, dies mit nativer Mitteln zu tun:

Im .h Ihrer VC hinzufügen:

#import <AVFoundation/AVFoundation.h> 
@interface FEQRViewController : UIViewController <AVCaptureMetadataOutputObjectsDelegate> 

Und in. m

@interface FEQRViewController() 

@property (nonatomic) BOOL isReading; 

@property (nonatomic, strong) AVCaptureSession *captureSession; 
@property (nonatomic, strong) AVCaptureVideoPreviewLayer *videoPreviewLayer; 

-(BOOL)startReading; 

-(void)stopReading; 

@end 

@implementation FEQRViewController 

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil 
{ 
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]; 
    if (self) { 
     // Custom initialization 
    } 
    return self; 
} 

- (void)viewDidLoad 
{ 
    [super viewDidLoad]; 
    self.view.backgroundColor = ....; 


    self.isReading = NO; 
    self.captureSession = nil; 


    // Do any additional setup after loading the view from its nib. 
} 

-(void)viewDidAppear:(BOOL)animated 
{ 
    [super viewDidAppear:animated]; 
    if (!self.isReading) { 
     if ([self startReading]) { 
      //[self.startButton setTitle:@"Stop" forState:UIControlStateNormal]; 
      [self.statusLabel setText:@"Scanning for QR Code..." ]; 
     } 
    } 
    else{ 
     [self stopReading]; 
     [self.startButton setTitle:@"Start!" forState:UIControlStateNormal]; 
    } 

} 

- (void)didReceiveMemoryWarning 
{ 
    [super didReceiveMemoryWarning]; 
    // Dispose of any resources that can be recreated. 
} 


-(BOOL)startReading 
{ 
    NSError *error; 
    AVCaptureDevice *captureDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo]; 

    AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:captureDevice error:&error]; 

    if (!input) { 
     NSLog(@"%@", [error localizedDescription]); 
     return NO; 
    } 

    self.captureSession = [[AVCaptureSession alloc] init]; 
    [self.captureSession addInput:input]; 

    AVCaptureMetadataOutput *captureMetadataOutput = [[AVCaptureMetadataOutput alloc] init]; 
    [self.captureSession addOutput:captureMetadataOutput]; 

    dispatch_queue_t dispatchQueue; 
    dispatchQueue = dispatch_queue_create("myQueue", NULL); 
    [captureMetadataOutput setMetadataObjectsDelegate:self queue:dispatchQueue]; 
    [captureMetadataOutput setMetadataObjectTypes:[NSArray arrayWithObject:AVMetadataObjectTypeQRCode]]; 

    self.videoPreviewLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:self.captureSession]; 
    [self.videoPreviewLayer setVideoGravity:AVLayerVideoGravityResizeAspectFill]; 
    [self.videoPreviewLayer setFrame:self.preview.layer.bounds]; 
    [self.preview.layer addSublayer:_videoPreviewLayer]; 

    [_captureSession startRunning]; 
    return YES; 
} 

-(void)stopReading 
{ 
    [self.captureSession stopRunning]; 

    self.captureSession = nil; 
    [self.videoPreviewLayer removeFromSuperlayer]; 

} 


-(void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection{ 
    if (metadataObjects != nil && [metadataObjects count] > 0) { 

     AVMetadataMachineReadableCodeObject *metadataObj = [metadataObjects objectAtIndex:0]; 
     if ([[metadataObj type] isEqualToString:AVMetadataObjectTypeQRCode]) { 
      [self.statusLabel performSelectorOnMainThread:@selector(setText:) withObject:[metadataObj stringValue] waitUntilDone:NO]; 
      NSURL *url = [NSURL URLWithString:[metadataObj stringValue]]; 
      if (url) 

       [self performSelectorOnMainThread:@selector(goToURL:) withObject:url waitUntilDone:NO]; 

      [self performSelectorOnMainThread:@selector(stopReading) withObject:nil waitUntilDone:NO]; 
      //[self.startButton performSelectorOnMainThread:@selector(setTitle:) withObject:@"Start!" waitUntilDone:NO]; 
      _isReading = NO; 
     } 
    } 
} 

-(void)goToURL:(NSURL *)url 
{ 
    //Handle URL... 
} 

- (IBAction)startButton:(id)sender { 

    if (!self.isReading) { 
     if ([self startReading]) { 
      [self.startButton setTitle:@"Stop" forState:UIControlStateNormal]; 
      [self.statusLabel setText:@"Scanning for QR Code..." ]; 
     } 
    } 
    else{ 
     [self stopReading]; 
     [self.startButton setTitle:@"Start!" forState:UIControlStateNormal]; 
    } 

    _isReading = !_isReading; 
} 

@end 

Answer 2

Dies funktioniert für mich mit iOS 8

ZBarReaderViewController *reader = [ZBarReaderViewController new]; 
reader.readerDelegate = self; 
reader.supportedOrientationsMask = ZBarOrientationMaskAll; 
[self presentViewController:reader animated:YES completion:nil]; 
[reader viewWillAppear:NO];`