iOS 蓝牙技巧

@property (nonatomic, strong) CBCentralManager *centralManager;

取消蓝牙未打开等系统提示框(是否打开蓝牙...)

        NSDictionary *dic = @{CBCentralManagerOptionShowPowerAlertKey:[NSNumber numberWithBool:NO]};        

_centralManager = [[CBCentralManager alloc] initWithDelegate:self queue:nil options:dic];

手动回调监控蓝牙状态（默认是创建时候调用，蓝牙状态改变时候调用）

 [_centralManager.delegate centralManagerDidUpdateState:_centralManager];

取CBPeer的identifier的标识符

CBPeripheral *backPeripheral;

Str =backPeripheral.identifier.UUIDString;