iOS CoreBluetooth:centralManager:didConnectPeripheral/didFailToConnectPeripheral:没有被调用

Question

我正在把头发拉出来解决这个问题.我正在尝试连接到BLE设备,无法在下面的代码中看到我做错了什么.

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.

    _cm = [[CBCentralManager alloc] initWithDelegate:self queue:nil];
}

- (void)viewDidAppear:(BOOL)animated {
    [super viewDidAppear:animated];
}


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

+ (NSString*)UUIDString:(CFUUIDRef)uuid {
    CFStringRef string = CFUUIDCreateString(NULL, uuid);
    return (__bridge_transfer NSString*)string;
}

- (void)centralManagerDidUpdateState:(CBCentralManager *)central {
    if (central.state == CBCentralManagerStatePoweredOn) {
        [self scanForPeripherals];
    }
}

- (void)centralManager:(CBCentralManager *)central
 didDiscoverPeripheral:(CBPeripheral *)peripheral
     advertisementData:(NSDictionary *)advertisementData
                  RSSI:(NSNumber *)RSSI {
//    NSLog(@"Received peripheral : \n%@", peripheral);
//    NSLog(@"Adv data : %@", advertisementData);

    [peripheral setDelegate:self];
    [central connectPeripheral:peripheral options:nil];
    [peripheral readRSSI];
}

- (int)scanForPeripherals {
    NSDictionary *options = [NSDictionary dictionaryWithObjectsAndKeys:
                             [NSNumber numberWithBool:NO], CBCentralManagerScanOptionAllowDuplicatesKey,
                             nil];

    [_cm scanForPeripheralsWithServices:nil options:options];
    return 0;
}

- (void)centralManager:(CBCentralManager *)central didConnectPeripheral:(CBPeripheral *)peripheral {
    NSLog(@"didConnectPeripheral");
}

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

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

- (void)peripheral:(CBPeripheral *)peripheral didReadRSSI:(NSNumber *)RSSI error:(NSError *)error {
    NSLog(@"didReadRSSI");
}

这些设备不是我自己的.我不知道它的接近度UUID,但据我所知,通过CoreBluetooth进行连接时不需要它吗？

didDiscoverPeripheral:在我尝试连接它们的选择器中发现了所有设备.但那之后什么也没发生.

当我打电话给我时,我是否期望与配对密码请求对话didDiscoverPeripheral:？如果是这样,我没有看到任何对话,为什么呢？

从苹果文件中,它清楚地表明,在尝试连接到设备之后,你应该得到一个didConnectPeripheral或两个,didFailToConnectPeripher但我没有.

有什么想法吗？我已经尝试了差不多一个星期了.感谢每一个帮助,谢谢.

Answer 1

如果你没有以某种方式保留peripheral传递给didDiscoverPeripheral它的对象,那么一旦这个委托方法退出就会释放它,你将无法获得连接.

我建议添加一个属性来跟踪发现的外围设备

@property (strong,nonatomic) NSMutableArray *peripherals;

在viewDidLoad或中初始化init

self.peripherals=[NSMutableArray new];

然后将外围设备添加到其中 didDiscoverPeripheral

-(void) centralManager:(CBCentralManager *)central didDiscoverPeripheral:(CBPeripheral *)peripheral advertisementData:(NSDictionary *)advertisementData RSSI:(NSNumber *)RSSI
{
    NSLog(@"Discovered peripheral %@",peripheral.identifier.UUIDString);
    [self.peripherals addObject:peripheral];
    [central connectPeripheral:peripheral options:nil];
}