gistfile1.m

- (void)viewWillAppear:(BOOL)animated
{
	[super viewWillAppear:animated];
	@weakify(self);
	[[[[[[[[self.output.rac_capturedMetadataObjectsSignal filter:^BOOL(AVMetadataMachineReadableCodeObject * codeObject) {
		return [codeObject isKindOfClass:[AVMetadataMachineReadableCodeObject class]] && [codeObject.type isEqual:@"org.iso.QRCode"];
	}] map:^id(AVMetadataMachineReadableCodeObject * codeObject) {
		return codeObject.stringValue;
	}].distinctUntilChanged map:^id(NSString * JSONString) {
		return [NSJSONSerialization JSONObjectWithData:[[JSONString stringByReplacingOccurrencesOfString:@"\\" withString:@""] dataUsingEncoding:NSASCIIStringEncoding] options:0 error:nil];
	}] filter:^BOOL(id value) {
		return value != nil && [value isKindOfClass:[NSDictionary class]];
	}] map:^id(NSDictionary * info) {
		return [FavouriteController tryFavouriteWithInfo:info];
	}] filter:^BOOL(id value) {
		return value != nil;
	}] take:1] subscribeNext:^(FavouriteController * favourite) {
		@strongify(self);
		[self.navigationController pushViewController:[self favouriteControllerFromFavourite:favourite] animated:YES];
	}];
}