實作property的getter跟setter

@interface BLEManager : NSObject{
    CBPeripheral* _activePeripheral;
}



//實作activePeripheral的getter

-(CBPeripheral*) activePeripheral{

    return _centralController.activePeripheral;

}

//實作activePeripheral的setter

-(void) setActivePeripheral:(CBPeripheral *)activePeripheral{

    _activePeripheral = activePeripheral;

}

Note.實作完之後，就要手動完成property的其他事情。