问题
When I am toggling bluetooth while connected to a CoreBluetooth peripheral I do a disconnection and deletion of all references to my peripheral in the centralManagerDidUpdateState callback.
Doing another scan will find and reconnect to the device and again issue a discoverServices, but this time around the callback didDiscoverServices never happens. By deleting all settings (General -> Reset -> Reset all settings) or do a reboot it works again. Disconnect/reconnect as normal does also work. How can I work around this or delete all cache and UUID's stored by iOS programatically?
回答1:
When you get the callback that the centralManager state has changed to CBCentralManagerStatePoweredOff, you need to loop through all your peripherals and call cancelConnection: on them. Then you'll be good to go.
[_yourCentralManager cancelPeripheralConnection:yourPeripheral];
回答2:
If the central state is CBManagerStatePoweredOn, and call the cancelPeripheralConnection API like this:
[self.centralManager cancelPeripheralConnection:self.peripheral];
the callback method centralManager:didDisconnectPeripheral:error: will be called. But if the state is not CBManagerStatePoweredOn, such as CBManagerStatePoweredOff, this callback will not execute.
来源：https://stackoverflow.com/questions/17966407/app-dont-discover-services-when-reconnecting-after-power-cycling-bluetooth