检查的iOS蓝牙状态 [英] Check bluetooth state in iOS

问题描述

我有一个应用程序（我不打算给这个应用程序提交给苹果的应用程序商店）使用，我想检查是否蓝牙开启。如果它被打开以后我就显示一个警告。

I have an application (I am not going to submit this app to apple app store) using which I want to check whether bluetooth is turned on. If it is turned on then I have to display an alert.

    - (void)centralManagerDidUpdateState:(CBCentralManager *)central{
  switch (central.state) {
    case CBCentralManagerStatePoweredOn:{
      //alert view
      break;
    }
  }

而在 viewDidLoad中我不喜欢这样。

  CBCentralManager * manager = [[CBCentralManager alloc] initWithDelegate:self queue:nil];

但这不是在ipad2的与iOS 5.1的工作。

but this is not working in ipad2 with ios 5.1.

问题是 central.state 总是空。

我希望同样的场景，从IOS 3.0工作到iOS 6测试版。是否有任何共同code检查蓝牙状态。

I want the same scenario to work from ios 3.0 to ios 6 beta. Is there any common code for checking bluetooth state.

任何可能的code是值得欢迎的，甚至code。与私有API。

Any possible code is welcome, even code with private api.

推荐答案

CBCentralManager 是通过蓝牙智能（蓝牙4.0低能量的一部分）。这只是最近的iOS / OS X设备引入了新的技术。目前支持在iPhone 4S和新iPad。而iPad 2不具备这种技术的支持。另外， CBCentralManager 只能从的iOS 5及以上。

CBCentralManager is for using Bluetooth Smart (the Low Energy part in Bluetooth 4.0). This is a new technology only recently introduced in iOS / OS X devices. Current support is in iPhone 4s and the new iPad. The iPad 2 does NOT have support for this technology. Also the CBCentralManager is only available from iOS 5 and up.

如果您要检查传统蓝牙状态，你将不得不寻找另一种方式来做到这一点。

If you want to check traditional Bluetooth state you will have to find another way to do that.

在你的情况 central.state 实际上应该等于 CBCentralManagerStateUnsupported 。

In your case central.state should actually equal CBCentralManagerStateUnsupported.

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