check if window with view is open - ios

Question

I have the following code:
#pragma mark Barcodescanner
- (void)barcodeScanner:(id)sender {
UIWindow *window = [UIApplication sharedApplication].delegate.window;
//UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0, 0, window.frame.size.width, window.frame.size.height)];
UIView *view = [[UIView alloc] initWithFrame:CGRectMake((window.frame.size.width - 600) / 2, (window.frame.size.height - 400) / 2, 600, 400)];
//Here it should be checked if the scanner is open, if it is open, the scanner should closed, if the scanner is not open, the scanner should be open
[window addSubview:view];
self.scanner = [[MTBBarcodeScanner alloc] initWithPreviewView:view];
[MTBBarcodeScanner requestCameraPermissionWithSuccess:^(BOOL success) {
if (success) {
[self.scanner startScanningWithResultBlock:^(NSArray *codes) {
[self.scanner stopScanning];
AVMetadataMachineReadableCodeObject *code = [codes firstObject];
NSRange rangeTypeOfEngine = NSMakeRange(0, 2);
NSString *typOfEngine = [code.stringValue substringWithRange:rangeTypeOfEngine];
NSRange rangeSerialNumberOfEngine = NSMakeRange(2, code.stringValue.length - 2);
NSString *serialNumberOfEngine = [code.stringValue substringWithRange:rangeSerialNumberOfEngine];
NSNumberFormatter *f = [[NSNumberFormatter alloc] init];
f.numberStyle = NSNumberFormatterDecimalStyle;
NSNumber *myNumber = [f numberFromString:typOfEngine];
NSString *nameOfEngine;
switch ([myNumber intValue]) {
case 10:
case 11:
case 12:
case 13:
nameOfEngine = #"T100";
break;
default:
nameOfEngine = #"noname";
serialNumberOfEngine = #"";
break;
}
Geraet *newGeraet = [NSEntityDescription insertNewObjectForEntityForName:#"Geraet" inManagedObjectContext:MOC];
newGeraet.einsatzbericht = self.einsatzbericht;
newGeraet.bezeichnung = nameOfEngine;
newGeraet.nummer = serialNumberOfEngine;
[MOC save:nil];
[[NSNotificationCenter defaultCenter] postNotificationName:kUpdateListOfDevices object:nil];
[view removeFromSuperview];
/*
NSArray *codeArray = [code.stringValue componentsSeparatedByString:#"\n"];
[view removeFromSuperview];
DLAVAlertView *alertView = [[DLAVAlertView alloc] initWithTitle:#"Fehler" message:#"Ungültiger Code" delegate:nil cancelButtonTitle:nil otherButtonTitles:#"OK", nil];
[alertView show];
*/
}];
} else {
[view removeFromSuperview];
}
}];
}
I add the full function to see what it would do.
My problem is, when someone click on the camperabutton for open the scanner, he couldn't cancel the scanner until he scan any barcode.

Answer 1

Camera and Alert View open in new window instead of your app window.