關閉並重新打開後，如何在後臺重新連接BLE設備？

Question

我正在研究一個與BLE相關的小項目。我有一個要求，我需要在手動關閉後在後臺重新連接設備，然後從iPhone->設置 - >藍牙關閉藍牙。

Answer 1

只需存儲外圍設備標識符或（UUID爲< iOS 7），檢索外圍設備，並在中央管理器更新狀態爲啓動時調用連接。

對於iOS 7：

- (void)centralManagerDidUpdateState:(CBCentralManager *)central 
    { 
     if(central.state == CBCentralManagerStatePoweredOn) 
     { 
      NSUUID *uuid = [[NSUUID alloc]initWithUUIDString:savedUUID];//where savedUUID is the string version of the NSUUID you've saved somewhere 

      NSArray *peripherals = [_cbCentralManager retrievePeripheralsWithIdentifiers:@[uuid]]; 

      for(CBPeripheral *periph in peripherals) 
      { 
       [_cbCentralManager connectPeripheral:periph options:nil]; 
      } 
     } 
    } 

對於iOS 6：

- (void)centralManagerDidUpdateState:(CBCentralManager *)central 
    { 
     if(central.state == CBCentralManagerStatePoweredOn) 
     { 
      CFUUIDRef uuid;//the cfuuidref you've previously saved 
      [central retrievePeripherals:@[(id)uuid]];//now wait for the delegate callback below 
     } 
    } 

    - (void)centralManager:(CBCentralManager *)central didRetrievePeripherals:(NSArray *)peripherals 
    { 
     for(CBPeripheral *periph in peripherals) 
     { 
      [_centralManager connectPeripheral:periph options:nil]; 
     } 
    } 

注：這些只是代碼段。您還應該監視CBCentralManagerStatePoweredOff（其中包括）並取消所有當前的外圍設備連接。