iOS SDK蓝牙4.0相关的组件为CoreBluetooth，官方文档翻译
Core Bluetooth Framework Reference 指南：
The Core Bluetooth framework provides the classes needed for your iOS and Mac apps to communicate with devices that are equipped with Bluetooth low energy wireless technology. ／CoreBluetooth框架提供了苹果设备去连接低功耗外围设备的类。
Classes
NSObject ：NSObject is the root class of most Objective-C class hierarchies.根类
CBATTRequest：The CBATTRequest class represents Attribute Protocol (ATT) read and write requests from remote central devices (represented by CBCentral objects).／CBATTRequest类展现ATT去读写来自远程中央设备（由CBCentral类代表）的请求。
CBCharacteristic：CBCharacteristic and its subclass CBMutableCharacteristic represent further information about a peripheral’s service.／CBCharacteristic和它的子类CBMutableCharacteristic进一步展示了一个外围设备peripheral的服务。
CBMutableCharacteristic：CBMutableCharacteristic objects represent the characteristics of a local peripheral’s service (local peripheral devices are represented by CBPeripheralManager objects).／CBMutableCharacteristic类展示了一个本地外围设备peripheral（CBPeripheralManager类代表本地peripheral设备）的服务。
CBDescriptor：CBDescriptor and it subclass CBMutableDescriptor represent a descriptor of a peripheral’s characteristic.／CBDescriptor和它的子类CBMutableDescriptor展示了一个外围设备peripheral的详细特征。
CBMutableDescriptor：CBMutableDescriptor objects represent the descriptors of a local peripheral’s characteristic (local peripheral devices are represented by CBPeripheralManager objects).／CBMutableDescriptor类展示了一个本地peripheral（CBPeripheralManager代表本地peripheral设备）的详细特征。
CBService：CBService and its subclass CBMutableService represent a peripheral’s service—a collection of data and associated behaviors for accomplishing a function or feature of a device (or portions of that device).／CBService和它的子类CBMutableService呈现了一个外围设备peripheral的服务－一连串的数据和分类的行为完成一个设备（或者设备的部分服务）的功能或者特征。
CBMutableService：The CBMutableService class adds write access to all of the properties in the CBService class it inherits from.／CBMutableService类可增加写访问继承自 CBService 类所有的属性。
CBCentralManager：CBCentralManager objects are used to manage discovered or connected remote peripheral devices (represented by CBPeripheral objects), including scanning for, discovering, and connecting to advertising peripherals.／CBCentralManager类被使用去管理发现或者连接的远程外围设备peripheral（由CBPeripheral类代表），包括扫描、发现和连接广告设备。
CBCentral：The CBCentral class represents remote central devices that have connected to an app implementing the peripheral role on a local device.／CBCentral类呈现已经连接到在本地设备上实现的APP的远程中心设备。
CBPeripheral：The CBPeripheral class represents remote peripheral devices that your app—by means of a central manager (an instance of CBCentralManager)—has discovered advertising or is currently connected to.／CBPeripheral类呈现你的APP－意思是中心管理者CBCentralManager 已经发现的广播或者被连接的远程外围设备peripheral。
CBPeripheralManager：CBPeripheralManager objects are used to manage published services within the local peripheral device’s Generic Attribute Profile (GATT) database and to advertise these services to central devices (represented by CBCentral objects).／CBPeripheralManager被用来去管理公共服务：本地外围设备peripheral的GATT数据库并且广播这些服务给中央设备（由CBCentral代表）。
CBUUID：Instances of the CBUUID class represent the 128-bit universally unique identifiers (UUIDs) of attributes used in Bluetooth low energy communication, such as a peripheral’s services, characteristics, and characteristic descriptors.／在使用蓝牙低能量交流中CBUUID类的实例呈现128位全局唯一标识符(uuid)属性，例如一个外围设备、特征集合和特征详细信息。
Protocols
CBCentralManagerDelegate：The CBCentralManagerDelegate protocol defines the methods that a delegate of a CBCentralManager object must adopt.／CBCentralManagerDelegate协议定义了很多CBCentralManager必须实现的代理方法。
CBPeripheralDelegate：The delegate of a CBPeripheral object must adopt the CBPeripheralDelegate protocol.／CBPeripheral的代理者必须实现CBPeripheralDelegate协议。
CBPeripheralManagerDelegate：The delegate of a CBPeripheralManager object must adopt the CBPeripheralManagerDelegate protocol, a protocol consisting of numerous optional methods and one required method.／CBPeripheralManager的代理者必须实现CBPeripheralManagerDelegate协议，一个协议组成的许多可选的方法和一个必需的方法。
iOS蓝牙编程指南 -- 核心蓝牙概述 http://www.jianshu.com/p/760f042a1d81
