ios - 无法发现外围蓝牙低功耗设备

Question

我最近将手机升级到 iOS Beta 版本 8 并安装了我的 iOS 应用程序。不幸的是，我的应用程序无法再发现我的外围 BLE 设备。我检查了任何说明是否有任何更改的文档，但没有发现。是否有任何已知的 API 更改作为 iOS 8 的一部分引入？我正在 iPhone 5s 上进行测试我的代码之前可以在 IOS 版本 7.xx 上运行

相关代码:

[self.CM scanForPeripheralsWithServices:nil options:nil];

Answer 1

您在哪里启动扫描？你应该打电话

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

在 viewDidLoad 或任何其他您需要的地方，然后仅在centralmanager状态打开时扫描外围设备:

-(void)centralManagerDidUpdateState:(CBCentralManager *)central{ switch (central.state) {
    case CBCentralManagerStatePoweredOff:
        NSLog(@"CoreBluetooth BLE hardware is powered off");
        break;
    case CBCentralManagerStatePoweredOn:
    {
        NSLog(@"CoreBluetooth BLE hardware is powered on and ready");
        [self.CM scanForPeripheralsWithServices:nil options:nil];
    }
        break;
    case CBCentralManagerStateResetting:
        NSLog(@"CoreBluetooth BLE hardware is resetting");
        break;
    case CBCentralManagerStateUnauthorized:
        NSLog(@"CoreBluetooth BLE state is unauthorized");
        break;
    case CBCentralManagerStateUnknown:
        NSLog(@"CoreBluetooth BLE state is unknown");
        break;
    case CBCentralManagerStateUnsupported:
        NSLog(@"CoreBluetooth BLE hardware is unsupported on this platform");
        break;
    default:
        break; }