Ios 无法发现外围蓝牙低能耗设备

我最近将手机升级到iOS Beta版本8，并安装了iOS应用程序。不幸的是，我的应用程序无法再发现我的外设

BLE

设备。我查看了所有说明是否有任何更改的文档，但没有发现任何更改。是否有任何已知的API更改作为iOS 8的一部分引入？我正在测试iphone5s 我的代码以前在IOS 7.xx版上运行

相关代码：

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

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你在哪里启动扫描？ 你应该打电话

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

在viewDidLoad或其他任何您需要的位置，仅当centralmanager状态为on时，才扫描外围设备：

-(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; }

另见此答案：