Question

我想使用CoreBluetooth（因为我的应用程序必须有资格使用App Store）来检查所有当前配对和连接的蓝牙设备。这不应该要求任何蓝牙扫描，对吗？我只是想看看系统配对了什么。如果我不能这样做，扫描是第二种选择。

我尝试的不起作用。它说蓝牙没有上电和崩溃，但是CBCentralManager的状态正在开启！关于如何解决这个问题的任何想法，还是我完全偏离轨道？

目前在ViewController中的所有这些：

    - (void)viewDidLoad{

    [super viewDidLoad];
    self.centralManager = [[CBCentralManager alloc] initWithDelegate:self queue:dispatch_get_main_queue()];

    [self.centralManager retrieveConnectedPeripherals]; //makes the system call didRetrieveConnectedPeripherals
}

- (void)centralManager:(CBCentralManager *)central didRetrieveConnectedPeripherals:(NSArray *)peripherals{
    NSLog(@"didRetrieveConnectedPeripherals called");
    for (CBPeripheral *a in peripherals){
        NSLog(a.name); //just log the name for now to see if it recognized it
    } //but it never ends up logging anything, and I have a BT keyboard paired/connected with the iPhone 5
} //and I get an error at some point, <CBConcreteCentralManager: 0x71ab020> is not powered on

- (void)centralManagerDidUpdateState:(CBCentralManager *)manager{
    if ([manager state] == CBCentralManagerStatePoweredOff) NSLog(@"CBCentralManagerStatePoweredOff");
    if ([manager state] == CBCentralManagerStatePoweredOn) NSLog(@"CBCentralManagerStatePoweredOn"); //this is what gets logged when I run it on an iPhone 5
    if ([manager state] == CBCentralManagerStateResetting) NSLog(@"CBCentralManagerStateResetting");
    if ([manager state] == CBCentralManagerStateUnauthorized) NSLog(@"CBCentralManagerStateUnauthorized");
    if ([manager state] == CBCentralManagerStateUnknown) NSLog(@"CBCentralManagerStateUnknown");
    if ([manager state] == CBCentralManagerStateUnsupported) NSLog(@"CBCentralManagerStateUnsupported");
}

Answer 1

我也一直在努力，希望我学到的一些东西会有所帮助。

一些事情：

1）您可能会因为在初始化CBCentralManager后立即调用[self.central retrieveConnectedPeripherals]而导致“蓝牙未启动”错误。您需要给CBCentralManager足够的时间来连接蓝牙硬件。

试试这个，

- (void)viewDidLoad{
    [super viewDidLoad];
    self.centralManager = [[CBCentralManager alloc] initWithDelegate:self queue:nil];
}
- (void)centralManagerDidUpdateState:(CBCentralManager *)manager {
   switch (manager.state) {
        case CBCentralManagerStatePoweredOn:
             NSLog(@"CBCentral Manager powered on");
             [self.centralManager retrieveConnectedPeripherals];
             break;
        case CBCentralManagerStatePoweredOff:
             ...etc.
}

另外，请注意CBCentralManager适用于具有蓝牙4.0的iOS设备。目前，蓝牙4安装在iPhone 4S / 5，iPod 4和iPad 3/4 / mini上。因此，请注意您的应用程序无法在iPad 1/2，iPhone 2/3和iPod 2/3上运行。

仍在弄清楚这一点，但也有可能你看不到你的键盘，因为它不是蓝牙4设备。让我知道你发现了什么。

（iOS）如何查看iPhone的配对蓝牙设备？

1 个答案: