HiBeacons/NTViewController.m

//
//  NTViewController.m
//  HiBeacons
//
//  Created by Nick Toumpelis on 2013-10-06.
//  Copyright (c) 2013 Nick Toumpelis.
//
//  Permission is hereby granted, free of charge, to any person obtaining a copy
//  of this software and associated documentation files (the "Software"), to deal
//  in the Software without restriction, including without limitation the rights
//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
//  copies of the Software, and to permit persons to whom the Software is
//  furnished to do so, subject to the following conditions:
//
//  The above copyright notice and this permission notice shall be included in
//  all copies or substantial portions of the Software.
//
//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
//  THE SOFTWARE.
//

#import "NTViewController.h"

static NSString * const kUUID = @"00000000-0000-0000-0000-000000000000";
static NSString * const kIdentifier = @"SomeIdentifier";
static NSString * const kCellIdentifier = @"BeaconCell";

@interface NTViewController ()

@property (nonatomic, strong) CLLocationManager *locationManager;
@property (nonatomic, strong) CLBeaconRegion *beaconRegion;
@property (nonatomic, strong) CBPeripheralManager *peripheralManager;
@property (nonatomic, strong) NSArray *detectedBeacons;

@end

@implementation NTViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    
    [self.advertisingSwitch addTarget:self
                              action:@selector(changeAdvertisingState:)
                    forControlEvents:UIControlEventValueChanged];
    [self.rangingSwitch addTarget:self
                              action:@selector(changeRangingState:)
                    forControlEvents:UIControlEventValueChanged];
}

#pragma mark - Beacon ranging
- (void)createBeaconRegion
{
    if (self.beaconRegion)
        return;
    
    NSUUID *proximityUUID = [[NSUUID alloc] initWithUUIDString:kUUID];
    self.beaconRegion = [[CLBeaconRegion alloc] initWithProximityUUID:proximityUUID identifier:kIdentifier];
}

- (void)turnOnRanging
{
    NSLog(@"Turning on ranging...");
    
    if (![CLLocationManager isRangingAvailable]) {
        NSLog(@"Couldn't turn on ranging: Ranging is not available.");
        self.rangingSwitch.on = NO;
        return;
    }
    
    if (self.locationManager.rangedRegions.count > 0) {
        NSLog(@"Didn't turn on ranging: Ranging already on.");
        return;
    }
    
    [self createBeaconRegion];
    [self.locationManager startRangingBeaconsInRegion:self.beaconRegion];
    
    NSLog(@"Ranging turned on for region: %@.", self.beaconRegion);
}

- (void)changeRangingState:sender
{
    UISwitch *theSwitch = (UISwitch *)sender;
    if (theSwitch.on) {
        [self startRangingForBeacons];
    } else {
        [self stopRangingForBeacons];
    }
}

- (void)startRangingForBeacons
{
    self.locationManager = [[CLLocationManager alloc] init];
    self.locationManager.delegate = self;
    
    [self turnOnRanging];
}

- (void)stopRangingForBeacons
{
    if (self.locationManager.rangedRegions.count == 0) {
        NSLog(@"Didn't turn off ranging: Ranging already off.");
        return;
    }
    
    [self.locationManager stopRangingBeaconsInRegion:self.beaconRegion];
    
    self.detectedBeacons = nil;
    [self.beaconTableView reloadData];

    NSLog(@"Turned off ranging.");
}

#pragma mark - Beacon ranging delegate methods
- (void)locationManager:(CLLocationManager *)manager didChangeAuthorizationStatus:(CLAuthorizationStatus)status
{
    if (![CLLocationManager locationServicesEnabled]) {
        NSLog(@"Couldn't turn on ranging: Location services are not enabled.");
        self.rangingSwitch.on = NO;
        return;
    }
     
    if ([CLLocationManager authorizationStatus] != kCLAuthorizationStatusAuthorized) {
        NSLog(@"Couldn't turn on ranging: Location services not authorised.");
        self.rangingSwitch.on = NO;
        return;
    }
    
    self.rangingSwitch.on = YES;
}

- (void)locationManager:(CLLocationManager *)manager
        didRangeBeacons:(NSArray *)beacons
               inRegion:(CLBeaconRegion *)region {
    if ([beacons count] == 0) {
        NSLog(@"No beacons found nearby.");
    } else {
        NSLog(@"Found %lu %@.", (unsigned long)[beacons count], [beacons count] > 1 ? @"beacons" : @"beacon");
    }
    
    self.detectedBeacons = beacons;
    [self.beaconTableView reloadData];
}

#pragma mark - Beacon advertising
- (void)turnOnAdvertising
{
    if (self.peripheralManager.state != CBPeripheralManagerStatePoweredOn) {
        NSLog(@"Peripheral manager is off.");
        self.advertisingSwitch.on = NO;
        return;
    }
    
    time_t t;
    srand((unsigned) time(&t));
    CLBeaconRegion *region = [[CLBeaconRegion alloc] initWithProximityUUID:self.beaconRegion.proximityUUID
                                                                     major:rand()
                                                                     minor:rand()
                                                                identifier:self.beaconRegion.identifier];
    NSDictionary *beaconPeripheralData = [region peripheralDataWithMeasuredPower:nil];
    [self.peripheralManager startAdvertising:beaconPeripheralData];
    
    NSLog(@"Turning on advertising for region: %@.", region);
}

- (void)changeAdvertisingState:sender
{
    UISwitch *theSwitch = (UISwitch *)sender;
    if (theSwitch.on) {
        [self startAdvertisingBeacon];
    } else {
        [self stopAdvertisingBeacon];
    }
}

- (void)startAdvertisingBeacon
{
    NSLog(@"Turning on advertising...");
    
    [self createBeaconRegion];
    
    if (!self.peripheralManager)
        self.peripheralManager = [[CBPeripheralManager alloc] initWithDelegate:self queue:nil options:nil];
    
    [self turnOnAdvertising];
}

- (void)stopAdvertisingBeacon
{
    [self.peripheralManager stopAdvertising];
    
    NSLog(@"Turned off advertising.");
}

#pragma mark - Beacon advertising delegate methods
- (void)peripheralManagerDidStartAdvertising:(CBPeripheralManager *)peripheralManager error:(NSError *)error
{
    if (error) {
        NSLog(@"Couldn't turn on advertising: %@", error);
        self.advertisingSwitch.on = NO;
        return;
    }
    
    if (peripheralManager.isAdvertising) {
        NSLog(@"Turned on advertising.");
        self.advertisingSwitch.on = YES;
    }
}

- (void)peripheralManagerDidUpdateState:(CBPeripheralManager *)peripheralManager
{
    if (peripheralManager.state != CBPeripheralManagerStatePoweredOn) {
        NSLog(@"Peripheral manager is off.");
        self.advertisingSwitch.on = NO;
        return;
    }

    NSLog(@"Peripheral manager is on.");
    [self turnOnAdvertising];
}

#pragma mark - Table view functionality
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    CLBeacon *beacon = self.detectedBeacons[indexPath.row];
    
    UITableViewCell *defaultCell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle
                                                          reuseIdentifier:kCellIdentifier];
    
    defaultCell.textLabel.text = beacon.proximityUUID.UUIDString;

    NSString *proximityString;
    switch (beacon.proximity) {
        case CLProximityNear:
            proximityString = @"Near";
            break;
        case CLProximityImmediate:
            proximityString = @"Immediate";
            break;
        case CLProximityFar:
            proximityString = @"Far";
            break;
        case CLProximityUnknown:
        default:
            proximityString = @"Unknown";
            break;
    }
    defaultCell.detailTextLabel.text = [NSString stringWithFormat:@"%@, %@ • %@ • %f • %li",
        beacon.major.stringValue, beacon.minor.stringValue, proximityString, beacon.accuracy, (long)beacon.rssi];
    defaultCell.detailTextLabel.textColor = [UIColor grayColor];
    
    return defaultCell;
}

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    return 1;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return self.detectedBeacons.count;
}

- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section
{
    return @"Detected beacons";
}

@end