禁掉系统蓝牙的弹窗

由于业务要求，需要禁掉蓝牙的系统弹窗

1.从app应用安装到手机，只会弹一次系统弹窗

初始化方式为：

manager = [[CBCentralManageralloc]initWithDelegate:selfqueue:dispatch_get_main_queue()options:nil];

2.每次初始化蓝牙api都会弹框

CBCentralManager*manager = [[CBCentralManageralloc]initWithDelegate:selfqueue:dispatch_get_main_queue()];

3.禁止系统蓝牙弹框

初始化蓝牙api

manager = [[CBCentralManageralloc]initWithDelegate:selfqueue:dispatch_get_main_queue()options:@{}];

options后参数默认为CBCentralManagerOptionShowPowerAlertKey：@（NO）

若CBCentralManagerOptionShowPowerAlertKey对应的value为YES，则效果跟2相同