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# CBCentralManager

An object that scans for, discovers, connects to, and manages peripherals.

```
class CBCentralManager
```

## Overview

[`CBCentralManager`](/documentation/CoreBluetooth/CBCentralManager) objects manage discovered or connected remote peripheral devices (represented by [`CBPeripheral`](/documentation/CoreBluetooth/CBPeripheral) objects), including scanning for, discovering, and connecting to advertising peripherals.

Before calling the [`CBCentralManager`](/documentation/CoreBluetooth/CBCentralManager) methods, set the state of the central manager object to powered on, as indicated by the [`CBCentralManagerState.poweredOn`](/documentation/CoreBluetooth/CBCentralManagerState/poweredOn) constant. This state indicates that the central device (your iPhone or iPad, for instance) supports Bluetooth low energy and that Bluetooth is on and available for use.

## Topics

### Initializing a Central Manager

[`init()`](/documentation/CoreBluetooth/CBCentralManager/init())

Initializes the central manager without a delegate.

[`init(delegate:queue:)`](/documentation/CoreBluetooth/CBCentralManager/init(delegate:queue:))

Initializes the central manager with a specified delegate and dispatch queue.

[`init(delegate:queue:options:)`](/documentation/CoreBluetooth/CBCentralManager/init(delegate:queue:options:))

Initializes the central manager with specified delegate, dispatch queue, and initialization options.

[Central Manager Initialization Options](/documentation/CoreBluetooth/central-manager-initialization-options)

Keys used to pass options when initializing a central manager.

[Central Manager State Restoration Options](/documentation/CoreBluetooth/central-manager-state-restoration-options)

Keys used to pass state restoration options to the central manager initializer.

### Establishing or Canceling Connections with Peripherals

[`connect(_:options:)`](/documentation/CoreBluetooth/CBCentralManager/connect(_:options:))

Establishes a local connection to a peripheral.

[Peripheral Connection Options](/documentation/CoreBluetooth/peripheral-connection-options)

Keys used to pass options when connecting to a peripheral.

[`cancelPeripheralConnection(_:)`](/documentation/CoreBluetooth/CBCentralManager/cancelPeripheralConnection(_:))

Cancels an active or pending local connection to a peripheral.

### Retrieving Lists of Peripherals

[`retrieveConnectedPeripherals(withServices:)`](/documentation/CoreBluetooth/CBCentralManager/retrieveConnectedPeripherals(withServices:))

Returns a list of the peripherals connected to the system whose services match a given set of criteria.

[`retrievePeripherals(withIdentifiers:)`](/documentation/CoreBluetooth/CBCentralManager/retrievePeripherals(withIdentifiers:))

Returns a list of known peripherals by their identifiers.

### Scanning or Stopping Scans of Peripherals

[`scanForPeripherals(withServices:options:)`](/documentation/CoreBluetooth/CBCentralManager/scanForPeripherals(withServices:options:))

Scans for peripherals that are advertising services.

[Peripheral Scanning Options](/documentation/CoreBluetooth/peripheral-scanning-options)

Keys used to pass options when scanning for peripherals.

[`stopScan()`](/documentation/CoreBluetooth/CBCentralManager/stopScan())

Asks the central manager to stop scanning for peripherals.

[`isScanning`](/documentation/CoreBluetooth/CBCentralManager/isScanning)

A Boolean value that indicates whether the central is currently scanning.

### Inspecting Feature Support

[`supports(_:)`](/documentation/CoreBluetooth/CBCentralManager/supports(_:))

Returns a Boolean that indicates whether the device supports a specific set of features.

[`CBCentralManager.Feature`](/documentation/CoreBluetooth/CBCentralManager/Feature)

An option set of device-specific features.

### Monitoring Properties

[`delegate`](/documentation/CoreBluetooth/CBCentralManager/delegate)

The delegate object that you want to receive central manager events.

### Receiving Connection Events

[`registerForConnectionEvents(options:)`](/documentation/CoreBluetooth/CBCentralManager/registerForConnectionEvents(options:))

Register for an event notification when the central manager makes a connection matching the given options.

[Peripheral Connection Options](/documentation/CoreBluetooth/peripheral-connection-options)

Keys used to pass options when connecting to a peripheral.

[`CBConnectionEvent`](/documentation/CoreBluetooth/CBConnectionEvent)

A change to the connection state of a peer.

[`CBConnectionEventMatchingOption`](/documentation/CoreBluetooth/CBConnectionEventMatchingOption)

A set of options to use when registering for connection events.

### Deprecated

[`CBCentralManagerState`](/documentation/CoreBluetooth/CBCentralManagerState)

Values that represent the current state of a central manager object.


---

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