前言
iBeacon的用处和好处我就不介绍了，大家可以看我最后面附录的参考文章。
本文重点介绍如何写一个app，通过2台iphone来实现iBeancon的收发。
强调一点，就是ibeacon是不能进行数据交互的，只能广播信号。
所需材料
iBeacon 使用低功耗的蓝牙技术，所以你必须要有一个内置有低功耗蓝牙的 iOS 设备以便与 iBeacon 协同工作。
为了做完这个实验，你需要其中2台如下的设备：
- iPhone 4s 或更新的
- 第三代 iPad 或更新的
- iPad mini 或更新的
- 第五代iPod touch 或更新的
另外，还需要一个开发者帐号进行真机调试，或者请同事亲戚朋友导出他的开发者证书到你机器上，又或者这2台设备都已经越狱。
基本概念
iBeacon 需要掌握的基本概念只有3个：ProximityUUID、major、minor。
ProximityUUID：感应标识符，全球唯一的标识符，128bit，通过命令uuidgen即可生成。用这个来区别其它公司或者机构的iBeacon产品。例如我们的咖啡店用下面的感应标识符：
boxertandeiMac:boxertan.github.io boxertan$ uuidgen
E172F7F9-4F2F-4378-A3A8-737433C6F9B1
major：主要值，扩展字段，16bit，比如说用来区别公司下属的分公司或者分店。例如我们的咖啡店分店：1为南山店，2为福田店，3为罗湖店，等等。
minor：次要值，再细分的扩展字段，16bit，比如说咖啡店南山分店用了10个 iBeacon 发射器，那么分别为1-10。
思路
- 实现发射器
- 实现接收器
实现
实现发射器
添加framework
- 选中项目名称
- 选中TARGETS
- 选中Build Phases
- 在Link Binary With Libraries中添加CoreBluetooth.framework 和 CoreLocation.framework
添加头文件和所需的类
在ConfigViewController.h添加头文件：
objective-c #import <CoreLocation/CoreLocation.h> #import <CoreBluetooth/CoreBluetooth.h>
并添加所需的属性：
objective-c @property (strong, nonatomic) CLBeaconRegion *beaconRegion; @property (strong, nonatomic) NSDictionary *beaconPeripheralData; @property (strong, nonatomic) CBPeripheralManager *peripheralManager;
再加上各种UI界面，整个代码如下ConfigViewController.h：
```objective-c #import <UIKit/UIKit.h> #import <CoreLocation/CoreLocation.h> #import <CoreBluetooth/CoreBluetooth.h>
@interface ConfigViewController : UIViewController <
CBPeripheralManagerDelegate
>
{
NSMutableString *uuid;
NSMutableString *major;
NSMutableString *minor;
NSMutableString *identity;
}
@property (weak, nonatomic) IBOutlet UILabel *uuidLabel;
@property (weak, nonatomic) IBOutlet UILabel *majorLabel;
@property (weak, nonatomic) IBOutlet UILabel *minorLabel;
@property (weak, nonatomic) IBOutlet UILabel *identityLabel;
@property (weak, nonatomic) IBOutlet UITextField *uuidText;
@property (weak, nonatomic) IBOutlet UITextField *majorText;
@property (weak, nonatomic) IBOutlet UITextField *minorText;
@property (weak, nonatomic) IBOutlet UITextField *identityText;
- (IBAction)ViewTouchDown:(id)sender;
@property (strong, nonatomic) CLBeaconRegion *beaconRegion;
@property (strong, nonatomic) NSDictionary *beaconPeripheralData;
@property (strong, nonatomic) CBPeripheralManager *peripheralManager;
@end
##### 什么是CLBeaconRegion?
>CL就是CoreLocation的缩写。
CLBeaconRegion实现Beacon信号区域的功能。
##### 什么是CBPeripheralManager?
>CB就是CoreBluetooth的缩写。CBPeripheralManager实现Beacon发射广播信号的功能。
到此，我们准备用 beaconRegion 来设置UUID、主要值、次要值，用 peripheralManager 来发射信号。
#### 初始化发射的Beacon
```objective-c
- (void)initBeacon
{
uuid = [NSMutableString stringWithString:@"23542266-18D1-4FE4-B4A1-23F8195B9D39"];
major = [NSMutableString stringWithString:@"11"];
minor = [NSMutableString stringWithString:@"12"];
identity = [NSMutableString stringWithString:@"com.BoXer.Test"];
}
- (void)setBeacon
{
NSUUID *nsuuid = [[NSUUID alloc] initWithUUIDString:uuid];
self.beaconRegion = [[CLBeaconRegion alloc] initWithProximityUUID:nsuuid
major:[major integerValue]
minor:[minor integerValue]
identifier:identity];
}
- (IBAction)transmitBeacon:(UIButton *)sender
{
self.beaconPeripheralData = [self.beaconRegion peripheralDataWithMeasuredPower:nil];
self.peripheralManager = [[CBPeripheralManager alloc] initWithDelegate:self
queue:nil
options:nil];
[self setBeaconInfo];
[self updateLabels];
[self setBeacon];
}
接收发送广播的delegate
objective-c -(void)peripheralManagerDidUpdateState:(CBPeripheralManager *)peripheral { if (peripheral.state == CBPeripheralManagerStatePoweredOn) { NSLog(@"Powered On"); [self.peripheralManager startAdvertising:self.beaconPeripheralData]; } else
if (peripheral.state == CBPeripheralManagerStatePoweredOff) { NSLog(@"Powered Off"); [self.peripheralManager stopAdvertising]; } }
于是，整个ConfigViewController.m的代码如下：
```objective-c #import "ConfigViewController.h"
@interface ConfigViewController ()
@end
@implementation ConfigViewController
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
[self initBeacon];
[self setBeacon];
[self updateText];
[self updateLabels];
}
- (void)initBeacon
{
uuid = [NSMutableString stringWithString:@"23542266-18D1-4FE4-B4A1-23F8195B9D39"];
major = [NSMutableString stringWithString:@"11"];
minor = [NSMutableString stringWithString:@"12"];
identity = [NSMutableString stringWithString:@"com.BoXer.Test"];
}
- (void)setBeacon
{
NSUUID *nsuuid = [[NSUUID alloc] initWithUUIDString:uuid];
self.beaconRegion = [[CLBeaconRegion alloc] initWithProximityUUID:nsuuid
major:[major integerValue]
minor:[minor integerValue]
identifier:identity];
}
- (void)updateText
{
self.uuidText.text = uuid;
self.majorText.text = major;
self.minorText.text = minor;
self.identityText.text = identity;
}
- (void)setBeaconInfo
{
[uuid setString: self.uuidText.text];
[major setString: self.majorText.text];
[minor setString: self.minorText.text];
[identity setString: self.identityText.text];
}
- (void)updateLabels
{
self.uuidLabel.text = uuid;
self.majorLabel.text = major;
self.minorLabel.text = minor;
self.identityLabel.text = identity;
}
- (IBAction)transmitBeacon:(UIButton *)sender
{
self.beaconPeripheralData = [self.beaconRegion peripheralDataWithMeasuredPower:nil];
self.peripheralManager = [[CBPeripheralManager alloc] initWithDelegate:self
queue:nil
options:nil];
[self setBeaconInfo];
[self updateLabels];
[self setBeacon];
}
-(void)peripheralManagerDidUpdateState:(CBPeripheralManager *)peripheral
{
if (peripheral.state == CBPeripheralManagerStatePoweredOn)
{
NSLog(@"Powered On");
[self.peripheralManager startAdvertising:self.beaconPeripheralData];
}
else if (peripheral.state == CBPeripheralManagerStatePoweredOff)
{
NSLog(@"Powered Off");
[self.peripheralManager stopAdvertising];
}
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (IBAction)ViewTouchDown:(id)sender
{
// 发送resignFirstResponder
// 这样使得点击空白处可收回键盘
[[UIApplication sharedApplication] sendAction:@selector(resignFirstResponder) to:nil from:nil forEvent:nil];
}
@end
做出来的界面是这样的：
### 实现接收器
在TrackViewController.h添加头文件：
```objective-c
#import <CoreLocation/CoreLocation.h>
并添加所需的属性：
objective-c @property (strong, nonatomic) CLBeaconRegion *beaconRegion; @property (strong, nonatomic) CLLocationManager *locationManager;
什么是CLLocationManager?
CL就是CoreLocation的缩写。 CLLocationManager实现位置管理。在这里主要是监控区域进出。
再加上一个UITableView，显示周围有多说个iBeacon发射器，于是 TrackViewController.h 代码如下：
```objective-c #import <UIKit/UIKit.h> #import <CoreLocation/CoreLocation.h>
@interface TrackViewController : UIViewController <
CLLocationManagerDelegate,
UITableViewDataSource,
UITableViewDelegate>
{
IBOutlet UITableView *tv;
NSMutableArray *iBeaconsInfo;
}
@property (strong, nonatomic) CLBeaconRegion *beaconRegion;
@property (strong, nonatomic) CLLocationManager *locationManager;
@end
#### 初始化region
```objective-c
- (void)initRegion
{
NSUUID *uuid = [[NSUUID alloc] initWithUUIDString:@"23542266-18D1-4FE4-B4A1-23F8195B9D39"];
self.beaconRegion = [[CLBeaconRegion alloc] initWithProximityUUID:uuid identifier:@"123"];
[self.locationManager startMonitoringForRegion:self.beaconRegion];
if (iBeaconsInfo == nil)
{
iBeaconsInfo = [[NSMutableArray alloc] init];
}
}
初始化locationManager
objective-c self.locationManager = [[CLLocationManager alloc] init]; self.locationManager.delegate = self; [self initRegion]; [self locationManager:self.locationManager didStartMonitoringForRegion:self.beaconRegion];
设置locationMagager的各种delegate
```objective-c - (void)locationManager:(CLLocationManager )manager didStartMonitoringForRegion:(CLRegion
)region { [self.locationManager startRangingBeaconsInRegion:self.beaconRegion]; }
- (void)locationManager:(CLLocationManager *)manager didEnterRegion:(CLRegion *)region
{
NSLog(@"Beacon Found");
[self.locationManager startRangingBeaconsInRegion:self.beaconRegion];
}
-(void)locationManager:(CLLocationManager *)manager didExitRegion:(CLRegion *)region
{
NSLog(@"Left Region");
[self.locationManager stopRangingBeaconsInRegion:self.beaconRegion];
[tv reloadData];
}
-(void)locationManager:(CLLocationManager *)manager didRangeBeacons:(NSArray *)beacons inRegion:(CLBeaconRegion *)region
{
if ([beacons count] > 0)
{
[iBeaconsInfo setArray:beacons];
[tv reloadData];
}
}
整个 TrackViewController.m 如下：
```objective-c
#import "TrackViewController.h"
@interface TrackViewController ()
@end
@implementation TrackViewController
- (void)viewDidLoad
{
[super viewDidLoad];
tv.delegate = self;
tv.dataSource = self;
[tv setBackgroundColor:[UIColor grayColor]];
self.locationManager = [[CLLocationManager alloc] init];
self.locationManager.delegate = self;
[self initRegion];
[self locationManager:self.locationManager didStartMonitoringForRegion:self.beaconRegion];
}
- (void)initRegion
{
NSUUID *uuid = [[NSUUID alloc] initWithUUIDString:@"23542266-18D1-4FE4-B4A1-23F8195B9D39"];
self.beaconRegion = [[CLBeaconRegion alloc] initWithProximityUUID:uuid identifier:@"123"];
[self.locationManager startMonitoringForRegion:self.beaconRegion];
if (iBeaconsInfo == nil)
{
iBeaconsInfo = [[NSMutableArray alloc] init];
}
}
- (void)locationManager:(CLLocationManager *)manager didStartMonitoringForRegion:(CLRegion *)region
{
[self.locationManager startRangingBeaconsInRegion:self.beaconRegion];
}
- (void)locationManager:(CLLocationManager *)manager didEnterRegion:(CLRegion *)region
{
NSLog(@"Beacon Found");
[self.locationManager startRangingBeaconsInRegion:self.beaconRegion];
}
-(void)locationManager:(CLLocationManager *)manager didExitRegion:(CLRegion *)region
{
NSLog(@"Left Region");
[self.locationManager stopRangingBeaconsInRegion:self.beaconRegion];
[tv reloadData];
}
-(void)locationManager:(CLLocationManager *)manager didRangeBeacons:(NSArray *)beacons inRegion:(CLBeaconRegion *)region
{
if ([beacons count] > 0)
{
[iBeaconsInfo setArray:beacons];
[tv reloadData];
}
}
#pragma mark - UITableView
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return [iBeaconsInfo count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *cellIdentifier = @"iBeaconsCell";
UITableViewCell *cell = [tv dequeueReusableCellWithIdentifier:cellIdentifier];
if (cell == nil)
{
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:cellIdentifier];
}
return [self prepareCellForBeaconInfo:cell index:indexPath];
}
- (UITableViewCell *)prepareCellForBeaconInfo:(UITableViewCell *)cell index:(NSIndexPath *)indexPath
{
CLBeacon *beacon = [iBeaconsInfo objectAtIndex:indexPath.row];
NSString *distanceText = [[NSString alloc] init];
if (beacon.proximity == CLProximityUnknown)
{
distanceText = @"未知距离";
}
else if (beacon.proximity == CLProximityImmediate)
{
distanceText = @"非常近";
}
else if (beacon.proximity == CLProximityNear)
{
distanceText = @"近";
}
else if (beacon.proximity == CLProximityFar)
{
distanceText = @"远";
}
cell.textLabel.numberOfLines = 0;
cell.detailTextLabel.numberOfLines = 0;
cell.textLabel.text = [NSString stringWithFormat:@"%@", beacon.proximityUUID.UUIDString];
cell.detailTextLabel.text = [NSString stringWithFormat:@"主要值：%@ 次要值：%@\r\n感应距离：%f\r\n大概距离：%@ 信号强度：%ld", beacon.major, beacon.minor, beacon.accuracy, distanceText, (long)beacon.rssi];
[cell sizeToFit];
return cell;
}
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
return 100;
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end
实际应用的界面如下：
附录
Developing iOS 7 Applications with iBeacons Tutorial
What is iBeacon? An explanation and tutorial for iOS 7
iBeacons Tutorial for iOS 7 with CLBeaconRegion and CLBeacon