iOS简单实现蓝牙的搜索,连接,接收数据

此文章是借鉴网上其他人的demo,我也是刚接触蓝牙,好多地方也是迷迷糊糊,希望有大神能多多指点.
导入框架:

#import <CoreBluetooth/CoreBluetooth.h>

遵循一下两个代理:

<CBCentralManagerDelegate, CBPeripheralDelegate>

定义属性:

@property (nonatomic, strong) CBCentralManager        *manager;
@property (nonatomic, strong) CBPeripheral              *peripheral;

创建蓝牙管理者对象:

- (void)viewDidLoad {
    [super viewDidLoad];

    self.manager = [[CBCentralManager alloc] initWithDelegate:self queue:nil];

}

实现蓝牙的一些代理方法:
// 该方法当蓝牙状态改变(打开或者关闭)的时候就会调用

-(void)centralManagerDidUpdateState:(CBCentralManager *)central
{
    switch (central.state) {
        case CBManagerStatePoweredOn:
        {
            NSLog(@"蓝牙已打开,请扫描外设");
            // 第一个参数填nil代表扫描所有蓝牙设备,第二个参数options也可以写nil
            [_manager scanForPeripheralsWithServices:nil options:@{CBCentralManagerScanOptionAllowDuplicatesKey : [NSNumber numberWithBool:YES]}];
        }
            break;
        case CBManagerStatePoweredOff:
        {
            NSLog(@"蓝牙没有打开,请先打开蓝牙");
        }
            break;
        default:
        {
            NSLog(@"该设备不支持蓝牙功能,请检查系统设置");
        }
            break;
    }
}

//查到外设后，停止扫描，连接设备

-(void)centralManager:(CBCentralManager *)central didDiscoverPeripheral:(CBPeripheral *)peripheral advertisementData:(NSDictionary *)advertisementData RSSI:(NSNumber *)RSSI {
    // 可在该方法内部区分扫描到的蓝牙设备
        NSLog(@"已发现 peripheral: %@ rssi: %@, UUID: %@ advertisementData: %@ ", peripheral.name, RSSI, peripheral.identifier, advertisementData);

         _peripheral = peripheral;
        [_manager connectPeripheral:_peripheral options:nil];

        // 扫描到设备之后停止扫描
        [_manager stopScan];
}

//连接外设成功，开始发现服务

- (void)centralManager:(CBCentralManager *)central didConnectPeripheral:(CBPeripheral *)peripheral {

    NSLog(@"成功连接 peripheral: %@ with UUID: %@",peripheral,peripheral.identifier);
   
    // 连接设备之后设置蓝牙对象的代理,扫描服务
    [self.peripheral setDelegate:self];
    [self.peripheral discoverServices:nil];
    NSLog(@"扫描服务");
    
}

//连接外设失败

-(void)centralManager:(CBCentralManager *)central didFailToConnectPeripheral:(CBPeripheral *)peripheral error:(NSError *)error
{
       
    NSLog(@"%@",error);
}

// 获取热点强度

-(void)peripheral:(CBPeripheral *)peripheral didReadRSSI:(NSNumber *)RSSI error:(NSError *)error {
    
    NSLog(@"%s,%@",__PRETTY_FUNCTION__,peripheral);
    
    int rssi = abs([RSSI intValue]);
    NSString *length = [NSString stringWithFormat:@"发现BLT4.0热点:%@,强度:%.1ddb",_peripheral,rssi];
   NSLog(@"距离：%@", length);

}

//已发现服务

-(void)peripheral:(CBPeripheral *)peripheral didDiscoverServices:(NSError *)error{
    
    NSLog(@"发现服务.");
 
    for (CBService *s in peripheral.services) {
        NSLog(@"%d :服务 UUID: %@(%@)",i,s.UUID.data,s.UUID);

        // 扫描到服务后,根据服务发现特征
        [peripheral discoverCharacteristics:nil forService:s];
        
    }
}

//已搜索到Characteristics

-(void)peripheral:(CBPeripheral *)peripheral didDiscoverCharacteristicsForService:(CBService *)service error:(NSError *)error{
    NSLog(@"发现特征的服务:%@ (%@)",service.UUID.data ,service.UUID);
    
    for (CBCharacteristic *c in service.characteristics) {
        NSLog(@"特征 UUID: %@ (%@)",c.UUID.data,c.UUID);
        // 此处FFE1为连接到蓝牙的特征UUID,我是获取之后写固定了,或许也可以不做该判断,我也不是太懂,如果有大神懂得希望指教一下.
        if ([c.UUID isEqual:[CBUUID UUIDWithString:@"FFE1"]]) {
            [_peripheral readValueForCharacteristic:c];
            [_peripheral setNotifyValue:YES forCharacteristic:c];
        }
        
    }
}

// 断开连接

- (void)centralManager:(CBCentralManager *)central didDisconnectPeripheral:(CBPeripheral *)peripheral error:(NSError *)error {
    
    [_manager cancelPeripheralConnection:_peripheral];
    NSLog(@"已断开与设备:[%@]的连接", peripheral.name);
  
}

//获取外设发来的数据，不论是read和notify,获取数据都是从这个方法中读取。

- (void)peripheral:(CBPeripheral *)peripheral didUpdateValueForCharacteristic:(CBCharacteristic *)characteristic error:(NSError *)error
{
    if ([characteristic.UUID isEqual:[CBUUID UUIDWithString:@"FFE1"]]) {
        NSData * data = characteristic.value;
        Byte * resultByte = (Byte *)[data bytes];

        // 此处的byte数组就是接收到的数据
         NSLog(@"%s", resultByte);
    
}

// 中心读取外设实时数据

- (void)peripheral:(CBPeripheral *)peripheral didUpdateNotificationStateForCharacteristic:(CBCharacteristic *)characteristic error:(NSError *)error {
    if (error) {
         NSLog(@"Error changing notification state: %@", error.localizedDescription);
    }
    
    // Notification has started
    if (characteristic.isNotifying) {
        [peripheral readValueForCharacteristic:characteristic];
    } else { // Notification has stopped
        // so disconnect from the peripheral
        NSLog(@"Notification stopped on %@.  Disconnecting", characteristic);
        [self updateLog:[NSString stringWithFormat:@"Notification stopped on %@.  Disconnecting", characteristic]];
        [self.manager cancelPeripheralConnection:self.peripheral];
    }
}

//用于检测中心向外设写数据是否成功

-(void)peripheral:(CBPeripheral *)peripheral didWriteValueForCharacteristic:(CBCharacteristic *)characteristic error:(NSError *)error
{
    if (error) {
        NSLog(@"=======%@",error.userInfo);
    }else{
        NSLog(@"发送数据成功");
    }
    
    /* When a write occurs, need to set off a re-read of the local CBCharacteristic to update its value */
    [peripheral readValueForCharacteristic:characteristic];
}