@property (nonatomic, strong) CBCentralManager *centralManager;

取消藍牙未打開等系統提示框(是否打開藍牙...)

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

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

手動回調監控藍牙狀態（默認是創建時候調用，藍牙狀態改變時候調用）

?[_centralManager.delegate centralManagerDidUpdateState:_centralManager];

取CBPeer的identifier的標識符

CBPeripheral *backPeripheral;

Str =backPeripheral.identifier.UUIDString;