（转）iOS蓝牙调用的一般流程

文章转自：http://www.cnblogs.com/ctaodream/archive/2013/07/03/3169962.html

一、服务端（也叫周边设备吧。。脑残的翻译）

1.实现类必须遵守协议 CBPeripheralManagerDelegate

2.需要的主要类有：

@property(strong,nonatomic) CBPeripheralManager *peripheraManager;

@property(strong,nonatomic) CBMutableCharacteristic *customerCharacteristic;

@property (strong,nonatomic) CBMutableService *customerService;

3.调用流程代码中有注释

//
//  ViewController.m
//  BlueToothDemo
//
//  Created by PSH_Chen_Tao on 7/3/13.
//  Copyright (c) 2013 wolfman. All rights reserved.
//

#import "ViewController.h"
static NSString *const kCharacteristicUUID = @"CCE62C0F-1098-4CD0-ADFA-C8FC7EA2EE90";

static NSString *const kServiceUUID = @"50BD367B-6B17-4E81-B6E9-F62016F26E7B";
@interface ViewController ()

@end

@implementation ViewController

@synthesize peripheraManager;
@synthesize customerCharacteristic;
@synthesize customerService;
- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    //初始化后会直接调用代理的  - (void)peripheralManagerDidUpdateState:(CBPeripheralManager *)peripheral

    peripheraManager = [[CBPeripheralManager alloc]initWithDelegate:self queue:nil];
  //  [peripheraManager startAdvertising:nil];

}

-(void)setUp{
    CBUUID *characteristicUUID = [CBUUID UUIDWithString:kCharacteristicUUID];
    customerCharacteristic = [[CBMutableCharacteristic alloc]initWithType:characteristicUUID properties:CBCharacteristicPropertyNotify value:nil permissions:CBAttributePermissionsReadable];
    CBUUID *serviceUUID = [CBUUID UUIDWithString:kServiceUUID];
    customerService = [[CBMutableService alloc]initWithType:serviceUUID primary:YES];
    [customerService setCharacteristics:@[characteristicUUID]];
    //添加后就会调用代理的- (void)peripheralManager:(CBPeripheralManager *)peripheral didAddService:(CBService *)service error:(NSError *)error
    [peripheraManager addService:customerService];

}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

#pragma  mark -- CBPeripheralManagerDelegate
- (void)peripheralManagerDidUpdateState:(CBPeripheralManager *)peripheral{
    switch (peripheral.state) {
            //在这里判断蓝牙设别的状态  当开启了则可调用  setUp方法(自定义)
        case CBPeripheralManagerStatePoweredOn:
            NSLog(@"powered on");
            [self setUp];
            break;
            case CBPeripheralManagerStatePoweredOff:
            NSLog(@"powered off");
            break;

        default:
            break;
    }
}

- (void)peripheralManager:(CBPeripheralManager *)peripheral didAddService:(CBService *)service error:(NSError *)error{
    if (error == nil) {
        //添加服务后可以在此向外界发出通告 调用完这个方法后会调用代理的
        //(void)peripheralManagerDidStartAdvertising:(CBPeripheralManager *)peripheral error:(NSError *)error
        [peripheraManager startAdvertising:@{CBAdvertisementDataLocalNameKey : @"Service",CBAdvertisementDataServiceUUIDsKey : [CBUUID UUIDWithString:kServiceUUID]}];
    }

}

- (void)peripheralManagerDidStartAdvertising:(CBPeripheralManager *)peripheral error:(NSError *)error{
    NSLog(@"in peripheralManagerDidStartAdvertisiong:error");
}
@end

二、客户端（也叫中心设备吧）

1.实现类要遵守协议<CBCentralManagerDelegate,CBPeripheralDelegate>

2.主要用到的类有

@property(strong,nonatomic)CBCentralManager *centralManager;

@property(strong,nonatomic)NSMutableData *mutableData;

@property(strong,nonatomic)CBPeripheral *peripheral;

3.一般的流程

//
//  ViewController.m
//  BlueToothClient
//
//  Created by PSH_Chen_Tao on 7/3/13.
//  Copyright (c) 2013 wolfman. All rights reserved.
//

#import "ViewController.h"
static NSString *const kCharacteristicUUID = @"CCE62C0F-1098-4CD0-ADFA-C8FC7EA2EE90";

static NSString *const kServiceUUID = @"50BD367B-6B17-4E81-B6E9-F62016F26E7B";
@interface ViewController ()

@end

@implementation ViewController

@synthesize centralManager;
@synthesize mutableData;
@synthesize peripheral;

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    //初始化后会调用代理CBCentralManagerDelegate 的 - (void)centralManagerDidUpdateState:(CBCentralManager *)central
    centralManager = [[CBCentralManager alloc]initWithDelegate:self queue:nil];

}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

#pragma  mark -- CBCentralManagerDelegate
- (void)centralManagerDidUpdateState:(CBCentralManager *)central{
    switch (central.state) {
            //判断状态开始扫瞄周围设备 第一个参数为空则会扫瞄所有的可连接设备  你可以
            //指定一个CBUUID对象 从而只扫瞄注册用指定服务的设备
            //scanForPeripheralsWithServices方法调用完后会调用代理CBCentralManagerDelegate的
            //- (void)centralManager:(CBCentralManager *)central didDiscoverPeripheral:(CBPeripheral *)peripheral advertisementData:(NSDictionary *)advertisementData RSSI:(NSNumber *)RSSI方法
        case CBCentralManagerStatePoweredOn:
            [centralManager scanForPeripheralsWithServices:@[[CBUUID UUIDWithString:kServiceUUID]] options:@{CBCentralManagerScanOptionAllowDuplicatesKey : YES}];

            break;

        default:
            break;
    }
}

- (void)centralManager:(CBCentralManager *)central didDiscoverPeripheral:(CBPeripheral *)peripheral advertisementData:(NSDictionary *)advertisementData RSSI:(NSNumber *)RSSI{
    if (peripheral) {
        self.peripheral = peripheral;
        //发现设备后即可连接该设备 调用完该方法后会调用代理CBCentralManagerDelegate的- (void)centralManager:(CBCentralManager *)central didConnectPeripheral:(CBPeripheral *)peripheral表示连接上了设别
        //如果不能连接会调用 - (void)centralManager:(CBCentralManager *)central didFailToConnectPeripheral:(CBPeripheral *)peripheral error:(NSError *)error
        [centralManager connectPeripheral:peripheral options:@{CBConnectPeripheralOptionNotifyOnConnectionKey : YES}];
    }
}

- (void)centralManager:(CBCentralManager *)central didConnectPeripheral:(CBPeripheral *)peripheral{
    NSLog(@"has connected");
    [mutableData setLength:0];
    self.peripheral.delegate = self;
    //此时设备已经连接上了  你要做的就是找到该设备上的指定服务 调用完该方法后会调用代理CBPeripheralDelegate（现在开始调用另一个代理的方法了）的
    //- (void)peripheral:(CBPeripheral *)peripheral didDiscoverServices:(NSError *)error
    [self.peripheral discoverServices:@[[CBUUID UUIDWithString:kServiceUUID]]];

}

- (void)centralManager:(CBCentralManager *)central didFailToConnectPeripheral:(CBPeripheral *)peripheral error:(NSError *)error{
    //此时连接发生错误
    NSLog(@"connected periphheral failed");
}

#pragma mark -- CBPeripheralDelegate
- (void)peripheral:(CBPeripheral *)peripheral didDiscoverServices:(NSError *)error{
    if (error==nil) {
        //在这个方法中我们要查找到我们需要的服务  然后调用discoverCharacteristics方法查找我们需要的特性
        //该discoverCharacteristics方法调用完后会调用代理CBPeripheralDelegate的
        //- (void)peripheral:(CBPeripheral *)peripheral didDiscoverCharacteristicsForService:(CBService *)service error:(NSError *)error
        for (CBService *service in peripheral.services) {
            if ([service.UUID isEqual:[CBUUID UUIDWithString:kServiceUUID]]) {
                [peripheral discoverCharacteristics:@[[CBUUID UUIDWithString:kCharacteristicUUID]] forService:service];
            }
        }
    }
}

- (void)peripheral:(CBPeripheral *)peripheral didDiscoverCharacteristicsForService:(CBService *)service error:(NSError *)error{
    if (error==nil) {
        //在这个方法中我们要找到我们所需的服务的特性 然后调用setNotifyValue方法告知我们要监测这个服务特性的状态变化
        //当setNotifyValue方法调用后调用代理CBPeripheralDelegate的- (void)peripheral:(CBPeripheral *)peripheral didUpdateNotificationStateForCharacteristic:(CBCharacteristic *)characteristic error:(NSError *)error
        for (CBCharacteristic *characteristic in service.characteristics) {
            if ([characteristic.UUID isEqual:[CBUUID UUIDWithString:kCharacteristicUUID]]) {

                [peripheral setNotifyValue:YES forCharacteristic:characteristic];
            }
        }
    }
}

- (void)peripheral:(CBPeripheral *)peripheral didUpdateNotificationStateForCharacteristic:(CBCharacteristic *)characteristic error:(NSError *)error{
    if (error==nil) {
        //调用下面的方法后 会调用到代理的- (void)peripheral:(CBPeripheral *)peripheral didUpdateValueForCharacteristic:(CBCharacteristic *)characteristic error:(NSError *)error
        [peripheral readValueForCharacteristic:characteristic];
    }
}

- (void)peripheral:(CBPeripheral *)peripheral didUpdateValueForCharacteristic:(CBCharacteristic *)characteristic error:(NSError *)error{

}

@end

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