React Native - 检查蓝牙是否打开，如果没有提醒用户？

Question

有没有办法检查蓝牙是否打开，如果没有，然后提醒用户？谢谢！

Answer 1

您将必须创建自己的 BT 模块并将其作为组件导入。

本机模块必须包含

#import <CoreBluetooth/CoreBluetooth.h>

查看BT状态

// This delegate will monitor for any changes in bluetooth state 

- (void)centralManagerDidUpdateState:(CBCentralManager *)central
{

    NSString *stateString = nil;
    switch(_bluetoothManager.state)
    {
        case CBCentralManagerStateResetting: stateString = @"The connection with the system service was momentarily lost, update imminent."; break;
        case CBCentralManagerStateUnsupported: stateString = @"The platform doesn't support Bluetooth Low Energy."; break;
        case CBCentralManagerStateUnauthorized: stateString = @"The app is not authorized to use Bluetooth Low Energy."; break;
        case CBCentralManagerStatePoweredOff: stateString = @"Bluetooth is currently powered off."; break;
        case CBCentralManagerStatePoweredOn: stateString = @"Bluetooth is currently powered on and available to use."; break;
        default: stateString = @"State unknown, update imminent."; break;
    }
  //stateString
  //do the react native thing and send the stateStringback or w/e you want. Maybe send an alert.
}

就是这样。我不会详细介绍如何创建本机组件，网上有很多教程。

或者当状态改变时，您可以调用 UIAlertView 委托，该委托将允许您向用户发送警报。

Answer 2

试试这个：

安装：npm install react-native-bluetooth-status --save

Link 这个插件：react-native link react-native-bluetooth-status

导入：import { BluetoothStatus } from 'react-native-bluetooth-status';

检查蓝牙打开或关闭代码：

BluetoothStatus.state() 是 return 布尔值。如果 return true 蓝牙是 ON 如果 return false 蓝牙是 OFF

componentDidMount() 
{
   this.checkInitialBluetoothState();
}

async checkInitialBluetoothState() 
{
const isEnabled = await BluetoothStatus.state();
console.log("check bluetooth on or off", isEnabled);
if(isEnabled == true){
  Alert.alert(
      'Bluethooth',
      'Bluetooth is turn on'
    );
 } else{
    Alert.alert(
      'Bluethooth',
      'Bluetooth is turn off'
    );
  }
}

react-native bluetooth status

React Native - 检查蓝牙是否打开，如果没有提醒用户？

React Native - Check if Bluetooth is turned on, and if not alert the user?

react-native

react-native-android

react-native-ios