iOS 藍牙連接的流程

iOS 藍牙連接的流程：

一、在 .h 文件中

1、加入頭文件 #import <CoreBluetooth/CoreBluetooth.h>

2、聲明以下變量

@property (nonatomic, strong)   CBCentralManager *m_manger; //管理者
@property (nonatomic, strong)   CBService        *m_service; //服務
@property (nonatomic, strong)   CBPeripheral     *m_peripheral;  //外設

二、在 .m 文件中

1、初始化管理者，掃描外設，連接指定外設

_m_manger = [[CBCentralManager alloc] initWithDelegate:self queue:nil];

[_m_manger scanForPeripheralsWithServices:nil options:nil];

[self.m_manger connectPeripheral:peripheral options:description];

2、判斷系統藍牙是否開啓

- (void)centralManagerDidUpdateState:(CBCentralManager *)central

3、實現發現外設的回調

- (void)centralManager:(CBCentralManager *)central didDiscoverPeripheral:(CBPeripheral *)peripheral advertisementData:(NSDictionary<NSString *,id> *)advertisementData RSSI:(NSNumber *)RSSI

4、實現已連接外設的回調

- (void)centralManager:(CBCentralManager *)central didConnectPeripheral:(CBPeripheral *)peripheral{
    _m_peripheral = peripheral;
    _m_peripheral.delegate = self;
    [_m_peripheral discoverServices:nil];
}

5、實現發現服務的回調

- (void)peripheral:(CBPeripheral *)peripheral didDiscoverServices:(NSError *)error{
    for (CBService *service in peripheral.services) {
        [peripheral discoverCharacteristics:nil forService:service];
    }
}

6、實現發現特徵值的回調，並監聽特徵值

- (void)peripheral:(CBPeripheral *)peripheral didDiscoverCharacteristicsForService:(CBService *)service error:(NSError *)error{
    if ([service.UUID isEqual:[UUIDTool serviceUUID01]]) {
        for (CBCharacteristic *characteristic in service.characteristics) {
            if ([characteristic.UUID isEqual:[UUIDTool characteristic01UUID]]) {
                
            }
	    // 監聽特徵值
            [_m_peripheral setNotifyValue:YES forCharacteristic:characteristic];
        }
    }
}

7、實現特徵值改變的回調

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

8、實現發送指令反饋信息的回調

- (void)peripheral:(CBPeripheral *)peripheral didWriteValueForCharacteristic:(CBCharacteristic *)characteristic error:(NSError *)error{
    if (!error) {
        NSLog(@"發送指令成功");
    }
    else{
        NSLog(@"發送指令失敗");
    }
}

9、實現外設連接失敗的回調

- (void)centralManager:(CBCentralManager *)central didFailToConnectPeripheral:(CBPeripheral *)peripheral error:(NSError *)error

10、實現外設連接後，再失去連接的回調

- (void)centralManager:(CBCentralManager *)central didDisconnectPeripheral:(CBPeripheral *)peripheral error:(NSError *)error