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最近写一个蓝牙项目 初步实现一下蓝牙设备连接交互，后期继续完善。。。。

1、连接蓝牙相关操作

BlueToothManger.h

//
//  BlueToothManger.h
//  SmartRobot
//
//  Created by 杜文杰 on 2017/8/2.
//  Copyright © 2017年 appleLJ. All rights reserved.
//

#import <Foundation/Foundation.h>
#import <CoreBluetooth/CoreBluetooth.h>@interface BlueToothManger : CBCentralManager
// connectSeccuss YES 连接成功 NO 连接失败
@property (nonatomic, copy) void(^cbperipheral)(CBPeripheral *peripheral,BOOL connectSeccuss);
@property (nonatomic, copy) void(^cbCharacteristic)(CBCharacteristic *characteristic);
- (instancetype)ShareBlueToothManger;
- (CBCentralManager *)centralManager;@end

BlueToothManger.m

//
//  BlueToothManger.m
//  SmartRobot
//
//  Created by 杜文杰 on 2017/8/2.
//  Copyright © 2017年 appleLJ. All rights reserved.
//

#import "BlueToothManger.h"
#import <CoreBluetooth/CoreBluetooth.h>@interface BlueToothManger ()<CBCentralManagerDelegate,CBPeripheralDelegate>
/// 中央管理者 -->管理设备的扫描 --连接
@property (nonatomic, strong) CBCentralManager *centralManager;
// 存储的设备
@property (nonatomic, strong) NSMutableArray *peripherals;
// 扫描到的设备
@property (nonatomic, strong) CBPeripheral *cbPeripheral;
// 文本
//@property (weak, nonatomic) IBOutlet UITextView *peripheralText;
// 蓝牙状态
@property (nonatomic, assign) CBManagerState peripheralState;@property (nonatomic, copy) NSString *sendServerValue;@property (nonatomic, copy) BlueToothManger *blueToothManger;
@end// 蓝牙4.0设备名
static NSString * const kBlePeripheralName = @"JDY-08";
// 通知服务
static NSString * const kNotifyServerUUID = @"FFE0";
// 写服务
static NSString * const kWriteServerUUID = @"FFE1";
// 通知特征值
static NSString * const kNotifyCharacteristicUUID = @"FFE1";
// 写特征值
static NSString * const kWriteCharacteristicUUID = @"FFE1";@implementation BlueToothManger- (instancetype)ShareBlueToothManger
{static dispatch_once_t onceToken;dispatch_once(&onceToken, ^{_blueToothManger = [[BlueToothManger alloc]init];});return _blueToothManger;}
- (NSMutableArray *)peripherals
{if (!_peripherals) {_peripherals = [NSMutableArray array];}return _peripherals;
}- (CBCentralManager *)centralManager
{if (!_centralManager){_centralManager = [[CBCentralManager alloc] initWithDelegate:self queue:nil];}return _centralManager;
}// 222  扫描设备
- (void)scanForPeripherals
{[self.centralManager stopScan];NSLog(@"扫描设备");//    [self showMessage:@"扫描设备"];if (self.peripheralState ==  CBManagerStatePoweredOn){[self.centralManager scanForPeripheralsWithServices:nil options:nil];}
}// 连接设备
- (void)connectToPeripheral
{if (self.cbPeripheral != nil){NSLog(@"连接设备");//        [self showMessage:@"连接设备"];
        [self.centralManager connectPeripheral:self.cbPeripheral options:nil];}else{//        [self showMessage:@"无设备可连接"];
    }
}// 清空设备
- (void)clearPeripherals
{NSLog(@"清空设备");[self.peripherals removeAllObjects];//    self.peripheralText.text = @"";//    [self showMessage:@"清空设备"];if (self.cbPeripheral != nil){// 取消连接NSLog(@"取消连接");//        [self showMessage:@"取消连接"];
        [self.centralManager cancelPeripheralConnection:self.cbPeripheral];}
}
////000
//- (void)viewDidLoad {
//    [super viewDidLoad];
//    [self centralManager];
//}
///111
//只要中心管理者初始化 就会触发此代理方法 判断手机蓝牙状态   状态更新时调用
- (void)centralManagerDidUpdateState:(CBCentralManager *)central
{switch (central.state) {case CBManagerStateUnknown:{NSLog(@"为知状态");self.peripheralState = central.state;}break;case CBManagerStateResetting:{NSLog(@"重置状态");self.peripheralState = central.state;}break;case CBManagerStateUnsupported:{NSLog(@"不支持的状态");self.peripheralState = central.state;}break;case CBManagerStateUnauthorized:{NSLog(@"未授权的状态");self.peripheralState = central.state;}break;case CBManagerStatePoweredOff:{NSLog(@"关闭状态");self.peripheralState = central.state;}break;case CBManagerStatePoweredOn:{NSLog(@"开启状态－可用状态");self.peripheralState = central.state;// 链接成功开始扫描设备
            [self scanForPeripherals];NSLog(@"%ld",(long)self.peripheralState);}break;default:break;}
}
/**333扫描到设备  发现设备是开启状态后调用方法@param central 中心管理者@param peripheral 扫描到的设备@param advertisementData 广告信息@param RSSI 信号强度*/
- (void)centralManager:(CBCentralManager *)central didDiscoverPeripheral:(CBPeripheral *)peripheral advertisementData:(NSDictionary<NSString *,id> *)advertisementData RSSI:(NSNumber *)RSSI
{//    [self showMessage:[NSString stringWithFormat:@"发现设备,设备名:%@",peripheral.name]];// 设备数组中是否存在 该设备if (![self.peripherals containsObject:peripheral]){[self.peripherals addObject:peripheral];NSLog(@"%@",peripheral);//最常用的场景是查找某一个前缀开头的设备 moguif ([peripheral.name hasPrefix:@"JDY"] ) {//            [self showMessage:@"开始连接"];
            [self.centralManager connectPeripheral:peripheral options:nil];}}
}/**连接失败@param central 中心管理者@param peripheral 连接失败的设备@param error 错误信息*/- (void)centralManager:(CBCentralManager *)central didFailToConnectPeripheral:(CBPeripheral *)peripheral error:(NSError *)error
{//    [self showMessage:@"连接失败"];if ([peripheral.name isEqualToString:kBlePeripheralName]){[self.centralManager connectPeripheral:peripheral options:nil];}
}/**连接断开@param central 中心管理者@param peripheral 连接断开的设备@param error 错误信息*/- (void)centralManager:(CBCentralManager *)central didDisconnectPeripheral:(CBPeripheral *)peripheral error:(NSError *)error
{//    [self showMessage:@"断开连接"];if ([peripheral.name isEqualToString:kBlePeripheralName]){[self.centralManager connectPeripheral:peripheral options:nil];}
}/**444连接成功@param central 中心管理者@param peripheral 连接成功的设备*/
- (void)centralManager:(CBCentralManager *)central didConnectPeripheral:(CBPeripheral *)peripheral
{NSLog(@"连接设备:%@成功",peripheral.name);//    self.peripheralText.text = [NSString stringWithFormat:@"连接设备:%@成功",peripheral.name];
//    [self showMessage:[NSString stringWithFormat:@"连接设备:%@成功",peripheral.name]];// 设备self.cbPeripheral = peripheral;self.cbperipheral(peripheral, YES);// 设置设备的代理peripheral.delegate = self;// services:传入nil  代表扫描所有服务
    [peripheral discoverServices:nil];
}/**555扫描到服务@param peripheral 服务对应的设备@param error 扫描错误信息*/
- (void)peripheral:(CBPeripheral *)peripheral didDiscoverServices:(NSError *)error
{// 遍历所有的服务for (CBService *service in peripheral.services){NSLog(@"服务:%@",service.UUID.UUIDString);// 获取对应的服务if ([service.UUID.UUIDString isEqualToString:kWriteServerUUID] || [service.UUID.UUIDString isEqualToString:kNotifyServerUUID]){// 根据服务去扫描特征
            [peripheral discoverCharacteristics:nil forService:service];}}
}/**666扫描到对应的特征@param peripheral 设备@param service 特征对应的服务@param error 错误信息*/
- (void)peripheral:(CBPeripheral *)peripheral didDiscoverCharacteristicsForService:(CBService *)service error:(NSError *)error
{// 遍历所有的特征for (CBCharacteristic *characteristic in service.characteristics){NSLog(@"特征值:%@",characteristic.UUID.UUIDString);if ([characteristic.UUID.UUIDString isEqualToString:kNotifyCharacteristicUUID]){self.cbCharacteristic(characteristic);}if ([characteristic.UUID.UUIDString isEqualToString:kNotifyCharacteristicUUID]){[peripheral setNotifyValue:YES forCharacteristic:characteristic];}}
}- (void)peripheral:(CBPeripheral *)peripheral didWriteValueForCharacteristic:(CBCharacteristic *)characteristic error:(NSError *)error;
{//这个方法比较好，这个是你发数据到外设的某一个特征值上面，并且响应的类型是 CBCharacteristicWriteWithResponse ，上面的官方文档也有，如果确定发送到外设了，就会给你一个回应，当然，这个也是要看外设那边的特征值UUID的属性是怎么设置的,看官方文档，人家已经说了，条件是，特征值UUID的属性：CBCharacteristicWriteWithResponseif (!error) {NSLog(@"说明发送成功，characteristic.uuid为：%@ 发送为%@",[characteristic.UUID UUIDString],characteristic.value);Byte byte2[] = {0xf0, 0x3d, 0x3d, 0x5d,0x02,0xf7};NSData* data2 = [[NSData alloc] initWithBytes:byte2 length:3];if ([characteristic.value isEqualToData:data2]) {NSLog(@"说明发送成功，characteristic.uuid为：%@ 发送为%@",[characteristic.UUID UUIDString],characteristic.value);}}else{NSLog(@"发送失败了啊！characteristic.uuid为：%@  原因:%@",[characteristic.UUID UUIDString],error);}//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];
}///**
// 根据特征读到数据
// 
// @param peripheral 读取到数据对应的设备
// @param characteristic 特征
// @param error 错误信息
// */
- (void)peripheral:(CBPeripheral *)peripheral didUpdateValueForCharacteristic:(nonnull CBCharacteristic *)characteristic error:(nullable NSError *)error
{if ([characteristic.UUID.UUIDString isEqualToString:kNotifyCharacteristicUUID]){NSData *data = characteristic.value;NSLog(@"%@",data);}
}@end

2、一般在登录后的主窗口 初始化下面这个类 连接蓝牙和保存蓝牙相关数据 保存蓝牙设备值和特征值  发送数据会用到

SaveValueForBlueThooth.h

//
//  SaveValueForBlueThooth.h
//  SmartRobot
//
//  Created by 杜文杰 on 2017/8/10.
//  Copyright © 2017年 appleLJ. All rights reserved.
//

#import <Foundation/Foundation.h>
#import <CoreBluetooth/CoreBluetooth.h>
#import "BlueToothManger.h"@interface SaveValueForBlueThooth : NSObject@property (nonatomic, strong) BlueToothManger *blueToothManager;
// 设备
@property (nonatomic, strong) CBPeripheral *peripheral;
// 特征值
@property (nonatomic, strong) CBCharacteristic *characteristic;
// 连接成功标识
@property (nonatomic, assign) BOOL connectSeccess;+ (instancetype)allocWithZone:(struct _NSZone *)zone;
// 重新连接
- (void)bluetoothConnect;
// 发送数据
- (void)postValueForBlueThoothWithString:(NSString *)valueWithStr;@end

SaveValueForBlueThooth.m

//
//  SaveValueForBlueThooth.m
//  SmartRobot
//
//  Created by 杜文杰 on 2017/8/10.
//  Copyright © 2017年 appleLJ. All rights reserved.
//

#import "SaveValueForBlueThooth.h"// 通知特征值
static NSString * const kNotifyCharacteristicUUID = @"FFE1";@implementation SaveValueForBlueThoothstatic SaveValueForBlueThooth *_instance;
+ (instancetype)allocWithZone:(struct _NSZone *)zone
{// 也可以使用一次性代码static dispatch_once_t onceToken;dispatch_once(&onceToken, ^{if (_instance == nil) {_instance = [super allocWithZone:zone];}});return _instance;
}// 连接蓝牙设备
- (void)bluetoothConnect
{[self.blueToothManager connectPeripheral:self.peripheral options:nil];}// 发送数据
- (void)postValueForBlueThoothWithString:(NSString *)valueWithStr
{NSLog(@"设备名：%@     特征值 %@",self.peripheral.name,self.characteristic);// 特征值NSString *tzName = self.characteristic.UUID.UUIDString;// 设备名NSString *peripheraName = self.peripheral.name;if (tzName.length > 0 && peripheraName.length > 0) {// 写入数据 M_1_1000_\rNSData *data = [valueWithStr dataUsingEncoding: NSUTF8StringEncoding];[self.peripheral writeValue:data forCharacteristic:self.characteristic type:CBCharacteristicWriteWithoutResponse];NSLog(@"%@",self.characteristic.UUID.UUIDString);NSLog(@"发送成功");}else {[self bluetoothConnect];NSLog(@"重新连接蓝牙");}}@end

3、在跟控制器 主窗口中声明属性

（1）

@property (nonatomic, strong) BlueToothManger *blueToothManager;
// 设备
@property (nonatomic, strong) CBPeripheral *peripheral;
// 特征值
@property (nonatomic, strong) CBCharacteristic *characteristic;
// 连接成功标识
@property (nonatomic, assign) BOOL connectSeccess;@property (nonatomic, strong) SaveValueForBlueThooth *saveValueForBlueThooth;

（2）在 viewDidLoad中调用连接蓝牙 并保存相关 发送需要的数据

- (void)viewDidLoad {[super viewDidLoad];// 连接蓝牙
    [self connectPeripheral];}

 

（3）

#pragma  mark - 蓝牙连接
- (void)connectPeripheral
{// 单例记录发送数据 需要用的 设备值和特征值_saveValueForBlueThooth = [[SaveValueForBlueThooth alloc]init];// 初始化blueToothManager类连接蓝牙设备self.blueToothManager = [[[BlueToothManger alloc]init]ShareBlueToothManger];[self.blueToothManager centralManager];__block__block typeof(SaveValueForBlueThooth *)saveValueForBlue = _saveValueForBlueThooth;// 连接蓝牙设备成功回调// 存储设备值self.blueToothManager.cbperipheral = ^(CBPeripheral *peripheral, BOOL connectSeccuss) {saveValueForBlue.peripheral = peripheral;saveValueForBlue.connectSeccess = connectSeccuss;};// 存储特征值self.blueToothManager.cbCharacteristic = ^(CBCharacteristic *characteristic) {saveValueForBlue.characteristic = characteristic;};
}

4、在需要发送数据的界面

（1）在 viewDidLoad中初始化类

 self.blueThoothPostValue = [[SaveValueForBlueThooth alloc]init];

（2）发送按钮点击事件

//上
- (void)topBtnEvent{NSLog(@"up");[self.blueThoothPostValue postValueForBlueThoothWithString:@"E 1\r"];
}