蓝牙中央管理器初始化详解

1、接口解释

/*!*  @method initWithDelegate:queue:options:**  @param delegate The delegate that will receive central role events.*  @param queue    The dispatch queue on which the events will be dispatched.*  @param options  An optional dictionary specifying options for the manager.**  @discussion     The initialization call. The events of the central role will be dispatched on the provided queue.*                  If <i>nil</i>, the main queue will be used.**    @seealso        CBCentralManagerOptionShowPowerAlertKey*    @seealso        CBCentralManagerOptionRestoreIdentifierKey**/
- (instancetype)initWithDelegate:(nullable id<CBCentralManagerDelegate>)delegatequeue:(nullable dispatch_queue_t)queueoptions:(nullable NSDictionary<NSString *, id> *)options NS_AVAILABLE(10_9, 7_0) NS_DESIGNATED_INITIALIZER;

delegate：CBCentralManager的回调代理

queue：CBCentralManager代理操作的所在队列，即delegate执行的所在队列。

options：其他选项，参考如下

2、Options解释

1、CBCentralManagerOptionShowPowerAlertKey

/*!*  **@const**  CBCentralManagerOptionShowPowerAlertKey**  **@discussion** An NSNumber (Boolean) indicating that the system should, if Bluetooth is powered off when <code>CBCentralManager</code> is instantiated, display* a warning dialog to the user.**  **@see** initWithDelegate:queue:options:**/

一个bool值，当蓝牙权限关闭的时候，如果CBCentralManager被初始化了，系统就是弹框提示用户蓝牙权限未开启

2、CBCentralManagerOptionRestoreIdentifierKey

/*!*  **@const**  CBCentralManagerOptionRestoreIdentifierKey**  **@discussion** An NSString containing a unique identifier (UID) for the <code>CBCentralManager</code> that is being instantiated. This UID is used* by the system to identify a specific <code>CBCentralManager</code> instance for restoration and, therefore, must remain the same for* subsequent application executions in order for the manager to be restored.**  **@see** initWithDelegate:queue:options:*  **@seealso** centralManager:willRestoreState:**/

一个string，当应用程序使用CBCentralManager与蓝牙设备进行通信时，如果设备支持（iOS 13及以上系统），可以在应用程序重启或系统重启后自动恢复与蓝牙设备的连接状态

3、CBCentralManagerOptionDeviceAccessForMedia

/*!*  **@const**  CBCentralManagerOptionDeviceAccessForMedia**  **@discussion** A Boolean representing the CBCentralManager init purpose is for DeviceAccess for media only. This will limit the functionality of this*  manager and only allow media device access without prompting the user for Bluetooth generic TCC.**  **@see** initWithDelegate:queue:options:**/

CBCentralManagerOptionDeviceAccessForMedia 是一个在iOS中用于蓝牙相关操作的选项，它用于请求访问设备的蓝牙硬件以及媒体输入和输出设备。

在iOS 13及更高版本中，当你使用CBCentralManager来管理蓝牙连接时，可以在初始化CBCentralManager时，通过options字典参数设置这个选项，以便让应用有权访问蓝牙硬件。

请注意，CBCentralManagerOptionDeviceAccessForMedia 是一个特定于iOS的选项，并不存在于其他操作系统上的Core Bluetooth框架中。因此，如果你在开发非iOS设备的应用，这个选项将不可用。