ios开发 MFI （充电接口外接设备连接，通信） api ExternalAccessory 代码 片段分享

官方 demo 下载地址 ：https://developer.apple.com/library/ios/samplecode/EADemo/Introduction/Intro.html

#import <ExternalAccessory/ExternalAccessory.h>[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(_accessoryDidConnect:) name:EAAccessoryDidConnectNotification object:nil];- (void)_accessoryDidConnect:(NSNotification *)notification {    EAAccessory *connectedAccessory = [[notification userInfo] objectForKey:EAAccessoryKey]; }@class EAAccessory;EA_EXTERN_CLASS_AVAILABLE(3_0) @interface EASession : NSObject {@private    EAAccessory *_accessory;    uint32_t _sessionID;    NSString *_protocolString;    NSInputStream *_inputStream;    NSOutputStream *_outputStream;    BOOL _openCompleted;}- (instancetype)initWithAccessory:(EAAccessory *)accessory forProtocol:(NSString *)protocolString __OSX_AVAILABLE_STARTING(__MAC_NA,__IPHONE_3_0);@property (nonatomic, readonly) EAAccessory *accessory __OSX_AVAILABLE_STARTING(__MAC_NA,__IPHONE_3_0);@property (nonatomic, readonly) NSString *protocolString __OSX_AVAILABLE_STARTING(__MAC_NA,__IPHONE_3_0);@property (nonatomic, readonly) NSInputStream *inputStream __OSX_AVAILABLE_STARTING(__MAC_NA,__IPHONE_3_0);@property (nonatomic, readonly) NSOutputStream *outputStream __OSX_AVAILABLE_STARTING(__MAC_NA,__IPHONE_3_0);@end

获取到  EAAccessory 之后 用  EAAccessory 和  协议来 创建会话  EASession ，用  EASession 的 

@property (nonatomic,readonly)NSInputStream *inputStream__OSX_AVAILABLE_STARTING(__MAC_NA,__IPHONE_3_0);

@property (nonatomic,readonly)NSOutputStream *outputStream__OSX_AVAILABLE_STARTING(__MAC_NA,__IPHONE_3_0);

这两个属性 进行 设备通信