iOS bluetooth's CBCentralManager not scanning devices after separating files - ios

Question

I'm trying to get a list of bluetooth devices nearby and display it in a UItableview.
Originally I have this written in one view controller file using storyboard, and it worked, but now I'm separating the files to TableViewController, TableDelegate and TableDataSource, and writing this programmatically, and I'm not sure how to split the file up into 3 and have it work. This is what I have so far. It compiles, but CBCentralManager never scans the devices and call the centralManagerDidUpdateState function
The original code:
MasterViewController.m
#import "MasterViewController.h"
#import "DetailViewController.h"
#interface MasterViewController ()
#property NSMutableArray *objects;
#end
#implementation MasterViewController
#pragma mark - CBCentralManagerDelegate
- (void)centralManager:(CBCentralManager *)central didDiscoverPeripheral:(CBPeripheral *)peripheral advertisementData:(NSDictionary *)advertisementData RSSI:(NSNumber *)RSSI
{
NSString *localName = [advertisementData objectForKey:CBAdvertisementDataLocalNameKey];
if ([localName length] > 0) {
if (![_foundPeripherals containsObject:peripheral]) {
NSLog(#"Found: %#", localName);
[_foundPeripherals addObject:peripheral];
[_adData addObject:advertisementData];
[_RSSI addObject:RSSI];
[self.tableView reloadData];
//peripheral.delegate = self;
}
}
}
// method called whenever the device state changes.
- (void)centralManagerDidUpdateState:(CBCentralManager *)central
{
if ([central state] == CBCentralManagerStatePoweredOn) {
NSLog(#"CoreBluetooth BLE hardware is powered on and ready");
NSArray *services = #[kDFUServiceUUID, kGuinnessServiceUUID, kHeartrateServiceUUID, kBatteryServiceUUID, kDeviceInfoServiceUUID];
NSDictionary *scanOptions = #{CBCentralManagerScanOptionAllowDuplicatesKey:#(YES)};
[self.centralManager scanForPeripheralsWithServices:services options:scanOptions];
}
}
- (void)viewDidLoad {
[super viewDidLoad];
self.deviceData = nil;
_foundPeripherals = [[NSMutableArray alloc] init];
_adData = [[NSMutableArray alloc] init];
_RSSI = [[NSMutableArray alloc] init];
CBCentralManager *centralManager = [[CBCentralManager alloc] initWithDelegate:self queue:nil];
self.centralManager = centralManager;
}
- (void)viewWillDisappear:(BOOL)animated {
[_centralManager stopScan];
NSLog(#"Scanning stopped");
[super viewWillDisappear:animated];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#pragma mark - Segues
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
if ([[segue identifier] isEqualToString:#"showDetail"]) {
NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow];
NSDate *object = self.objects[indexPath.row];
[[segue destinationViewController] setDetailItem:object];
}
}
#pragma mark - Table View
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return [self.foundPeripherals count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *simpleTableIdentifier = #"SimpleTableCell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:simpleTableIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:simpleTableIdentifier];
}
CBPeripheral *peripheral=[_foundPeripherals objectAtIndex:indexPath.row];
cell.textLabel.text = peripheral.name;
return cell;
}
#end
New, separated code that doesn't work.
TableViewController.m
#import "TableViewController.h"
#import "TableDataSource.h"
#import "TableDelegate.h"
#interface TableViewController () {
TableDataSource *_dataSource;
TableDelegate *_delegate;
}
#end
#implementation TableViewController
- (void)loadView {
self.view = [[UIView alloc] init];
self.view.autoresizingMask = UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth;
UITableView *tableView = [[UITableView alloc] initWithFrame:[[UIScreen mainScreen] applicationFrame] style:UITableViewStylePlain];
tableView.autoresizingMask = UIViewAutoresizingFlexibleHeight|UIViewAutoresizingFlexibleWidth;
self.view = tableView;
_dataSource = [[TableDataSource alloc] init];
_delegate = [[TableDelegate alloc] init];
_delegate.controller = self;
self.tableView.dataSource = _dataSource;
self.tableView.delegate = _delegate;
[self.tableView registerClass: [UITableViewCell class] forCellReuseIdentifier: #"device"];
}
- (void)viewDidLoad {
[super viewDidLoad];
[_dataSource getBluetoothDevices];
[[NSNotificationCenter defaultCenter] removeObserver:self name:#"reloadTable"
object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:#selector(checkRes:) name:#"reloadTable" object:nil];
}
-(void)checkRes:(NSNotification *)notification
{
if ([[notification name] isEqualToString:#"reloadTable"])
{
[self.tableView reloadData];
}
}
TableDelegate.h
#import <UIKit/UIKit.h>
#import CoreBluetooth;
#interface TableDelegate : NSObject <UITableViewDelegate, CBCentralManagerDelegate, CBPeripheralDelegate>
#property (nonatomic, weak) UIViewController *controller;
#end
TableDelegate.m
#import "TableDelegate.h"
#import "TableDataSource.h"
#import "DetailViewController.h"
#interface TableDelegate () {
TableDataSource *_dataSource;
}
#end
#implementation TableDelegate
- (instancetype)initWithDataSource:(TableDataSource *)dataSource {
self = [super init];
if (!self) return nil;
_dataSource = dataSource;
return self;
}
// method called whenever the device state changes.
- (void)centralManagerDidUpdateState:(CBCentralManager *)central
{
if ([central state] == CBCentralManagerStatePoweredOn) {
NSLog(#"CoreBluetooth BLE hardware is powered on and ready");
NSArray *services = #[kDFUServiceUUID, kGuinnessServiceUUID, kHeartrateServiceUUID, kBatteryServiceUUID, kDeviceInfoServiceUUID];
NSDictionary *scanOptions = #{CBCentralManagerScanOptionAllowDuplicatesKey:#(YES)};
[_dataSource.centralManager scanForPeripheralsWithServices:services options:scanOptions];
}
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
[tableView deselectRowAtIndexPath: indexPath animated: YES];
DetailViewController *detail = [[DetailViewController alloc] init];
[_controller.navigationController pushViewController: detail animated: YES];
}
#end
TableDataSource.m
#import "TableDataSource.h"
#import "TableViewController.h"
#import "TableDelegate.h"
#interface TableDataSource () {
TableDelegate *_delegate;
}
#end
#implementation TableDataSource
- (instancetype)initWithDelegate:(TableDelegate *)delegate {
self = [super init];
if (!self) return nil;
_delegate = delegate;
return self;
}
- (void)getBluetoothDevices
{
_foundPeripherals = [[NSMutableArray alloc] init];
_adData = [[NSMutableArray alloc] init];
_RSSI = [[NSMutableArray alloc] init];
CBCentralManager *centralManager = [[CBCentralManager alloc] initWithDelegate:_delegate queue:nil];
self.centralManager = centralManager;
}
// method called whenever you have successfully connected to the BLE peripheral
- (void)centralManager:(CBCentralManager *)central didConnectPeripheral:(CBPeripheral *)peripheral
{
}
- (void)centralManager:(CBCentralManager *)central didDiscoverPeripheral:(CBPeripheral *)peripheral advertisementData:(NSDictionary *)advertisementData RSSI:(NSNumber *)RSSI
{
NSString *localName = [advertisementData objectForKey:CBAdvertisementDataLocalNameKey];
if ([localName length] > 0) {
if (![_foundPeripherals containsObject:peripheral]) {
NSLog(#"Found: %#", localName);
[_foundPeripherals addObject:peripheral];
[_adData addObject:advertisementData];
[_RSSI addObject:RSSI];
[[NSNotificationCenter defaultCenter] postNotificationName:#"reloadTable" object:self];
//peripheral.delegate = self;
}
}
}
// method called whenever the device state changes.
- (void)centralManagerDidUpdateState:(CBCentralManager *)central
{
if ([central state] == CBCentralManagerStatePoweredOn) {
NSLog(#"CoreBluetooth BLE hardware is powered on and ready");
NSArray *services = #[kDFUServiceUUID, kGuinnessServiceUUID, kHeartrateServiceUUID, kBatteryServiceUUID, kDeviceInfoServiceUUID];
NSDictionary *scanOptions = #{CBCentralManagerScanOptionAllowDuplicatesKey:#(YES)};
[self.centralManager scanForPeripheralsWithServices:services options:scanOptions];
}
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
[self getBluetoothDevices];
return [self.foundPeripherals count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *simpleTableIdentifier = #"device";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:simpleTableIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:simpleTableIdentifier];
}
CBPeripheral *peripheral=[_foundPeripherals objectAtIndex:indexPath.row];
cell.textLabel.text = peripheral.name;
return cell;
}
#end