Accessing Objective C NSDictionary Values in Swift - ios

Question

I am working on a project using Neurosky MindWave to create an IOS app. I am using the ThinkGear SDK for IOS available here: http://developer.neurosky.com/docs/doku.php?id=beta
The project reads values from the MindWave device and stores them in a NSDictionary in Objective C implementation file. I am trying to access these values in my Swift file to control 3D animations in SceneKit.
Here's the set up in the header file:
// the eSense values
typedef struct {
int attention;
int meditation;
} ESenseValues;
// the EEG power bands
typedef struct {
int delta;
int theta;
int lowAlpha;
int highAlpha;
int lowBeta;
int highBeta;
int lowGamma;
int highGamma;
} EEGValues;
#interface RootViewController : UITableViewController <TGAccessoryDelegate> {
short rawValue;
int rawCount;
int buffRawCount;
int blinkStrength;
int poorSignalValue;
int heartRate;
float respiration;
int heartRateAverage;
int heartRateAcceleration;
ESenseValues eSenseValues;
EEGValues eegValues;
bool logEnabled;
NSFileHandle * logFile;
NSString * output;
UIView * loadingScreen;
NSThread * updateThread;
}
// TGAccessoryDelegate protocol methods
- (void)accessoryDidConnect:(EAAccessory *)accessory;
- (void)accessoryDidDisconnect;
- (void)dataReceived:(NSDictionary *)data;
- (UIImage *)updateSignalStatus;
- (void)initLog;
- (void)writeLog;
#property (nonatomic, retain) IBOutlet UIView * loadingScreen;
Here's the Objective C code which stores the values in a dictionary:
// This method gets called by the TGAccessoryManager when data is received from the
// ThinkGear-enabled device.
- (void)dataReceived:(NSDictionary *)data {
[data retain];
NSString * temp = [[NSString alloc] init];
NSDate * date = [NSDate date];
// check to see whether the eSense values are there. if so, we assume that
// all of the other data (aside from raw) is there. this is not necessarily
// a safe assumption.
if([data valueForKey:#"eSenseAttention"]){
eSenseValues.attention = [[data valueForKey:#"eSenseAttention"] intValue];
eSenseValues.meditation = [[data valueForKey:#"eSenseMeditation"] intValue];
temp = [temp stringByAppendingFormat:#"%f: Attention: %d\n", [date timeIntervalSince1970], eSenseValues.attention];
temp = [temp stringByAppendingFormat:#"%f: Meditation: %d\n", [date timeIntervalSince1970], eSenseValues.meditation];
eegValues.delta = [[data valueForKey:#"eegDelta"] intValue];
eegValues.theta = [[data valueForKey:#"eegTheta"] intValue];
eegValues.lowAlpha = [[data valueForKey:#"eegLowAlpha"] intValue];
eegValues.highAlpha = [[data valueForKey:#"eegHighAlpha"] intValue];
eegValues.lowBeta = [[data valueForKey:#"eegLowBeta"] intValue];
eegValues.highBeta = [[data valueForKey:#"eegHighBeta"] intValue];
eegValues.lowGamma = [[data valueForKey:#"eegLowGamma"] intValue];
eegValues.highGamma = [[data valueForKey:#"eegHighGamma"] intValue];
}
if(logEnabled) {
[output release];
output = [[NSString stringWithString:temp] retain];
[self performSelectorOnMainThread:#selector(writeLog) withObject:nil waitUntilDone:NO];
}
//[temp release];
// release the parameter
[data release];
}
Whenever I try to get any of these values I get "Use of unresolved identifier" or similar error. I am trying to display them as 3D text in SceneKit:
override func viewDidLoad() {
super.viewDidLoad()
// Create Scene
let scene = SCNScene()
let myText = SCNText(string: attention , extrusionDepth: 5)
myText.font = UIFont(name: "Optima", size: 1)
let myTextNode = SCNNode(geometry: myText)
myTextNode.position = SCNVector3(x: -2, y: -1, z: -7)
myTextNode.orientation = SCNQuaternion(x: 0.1, y: 0, z: 0.5, w: 0)
scene.rootNode.addChildNode(myTextNode)
}
I'm very new to IOS development and have been working on how to do this for nearly a week now. Any clues on being able to access the values would be very much appreciated.