一.说明
1-苹果手机从iPhone6开始装有NFC硬件，但并未对第三方应用开放。因此iPhone6及iPhone6s不能识别NFC标签，但是可以使用系统NFC功能如：刷地铁。
2-苹果从iOS11系统开始开放NFC读取功能，同时要求iPhone7及以上机型。不满足要求则无法读取NFC标签
3-苹果在iOS13系统开放了标签写入功能，想要向标签内写入数据，需要升级系统到iOS13，同样只能写入DNEF格式数据
4-另外苹果只开放DNEF数据格式的NFC标签读取，如果数据格式不满足则无法读取。身份证、地铁卡、银行卡、大部分的工卡都不是DNEF格式，因此无法读取。（空标签只能在iOS13系统下才可以读取到）（NFC标签可以去淘宝购买，价格很便宜 9.9六个还包邮）
5-身份证、地铁卡虽然无法读取到数据，但是可以用苹果官方APP“快捷指令”进行标记，来实现一些新颖玩法（需要iPhoneXS以上机型）
6-关于后台读取，iPhoneXS以上机型支持，屏幕点亮状态下（无需解锁），手机可以读取一些特定数据格式的NFC标签。识别到标签后，可以实现拨打电话，发送邮件等功能（需解锁）
二.项目推荐
我自己写的一个关于NFC读写的APP，可以直接用来调试NFC标签
https://itunes.apple.com/cn/app/id1492298987
三.工程配置
1.需要配置Capabilitles。使用NFC需要配置Capabilitles，这会自动为你生成entitlements文件中的必要配置。
图一
2.打开隐私相关设置。向info.plist中添加Privacy - NFC Scan Usage Description。
图二
3.激活App ID的相关功能。如下图所示（自动签名项目系统会自动配置）
图三
四.代码
1.NFCManager.h
#import
#import
NS_ASSUME_NONNULL_BEGIN
typedef NS_ENUM(NSInteger, NFCSupportsStatus) {
NFCSupportStatusYes,//支持
NFCSupportStatusDeviceNo,//硬件不支持
NFCSupportStatusnSystemNo,//系统不支持
};
API_AVAILABLE(ios(11.0))
typedef void(^NFCScanSuccessBlock)(NFCNDEFMessage *message);
typedef void(^NFCScanErrorBlock)(NSError *error);
typedef void(^NFCWriteSuccessBlock)(void);
typedef void(^NFCWritErrorBlock)(NSError *error);
API_AVAILABLE(ios(11.0))
@interface NFCManager : NSObject
@property(nonatomic,copy)NFCScanSuccessBlock scanSuccessBlock;
@property(nonatomic,copy)NFCScanErrorBlock scanErrorBlock;
@property(nonatomic,copy)NFCWriteSuccessBlock writeSuccessBlock;
@property(nonatomic,copy)NFCWritErrorBlock writErrorBlock;
@property(nonatomic,assign) BOOL moreTag;//多标签识别
+(NFCManager *)sharedInstance;
-(void)scanTagWithSuccessBlock:(NFCScanSuccessBlock)scanSuccessBlock andErrorBlock:(NFCScanErrorBlock)scanErrorBlock;
-(void)writeMessage:(NFCNDEFMessage *)message ToTagWithSuccessBlock:(NFCWriteSuccessBlock)writeSuccessBlock andErrorBlock:(NFCWritErrorBlock)writErrorBlock;
//判断是否支持读写功能
+(NFCSupportsStatus)isSupportsNFCReading;
+(NFCSupportsStatus)isSupportsNFCWrite;
//获取类型名数组
+(NSArray*)getNameFormatArray;
//获取类型名字
+(NSString*)getNameFormat:(NFCTypeNameFormat)typeName;
//获取类型结构体
+(NFCTypeNameFormat)getNFCTypeNameFormat:(NSString*)typeName;
@end
NS_ASSUME_NONNULL_END
1.NFCManager.m
#import "NFCManager.h"
API_AVAILABLE(ios(11.0))
@interface NFCManager (){
BOOL isReading;
}
@property (strong, nonatomic) NFCNDEFReaderSession *session;
@property (strong, nonatomic) NFCNDEFMessage *message;
@end
@implementation NFCManager
#pragma mark - 单例方法
+(NFCManager *)sharedInstance{
static dispatch_once_t onceToken;
static NFCManager * sSharedInstance;
dispatch_once(&onceToken, ^{
sSharedInstance = [[NFCManager alloc] init];
});
return sSharedInstance;
}
-(void)scanTagWithSuccessBlock:(NFCScanSuccessBlock)scanSuccessBlock andErrorBlock:(NFCScanErrorBlock)scanErrorBlock{
self.scanSuccessBlock=scanSuccessBlock;
self.scanErrorBlock=scanErrorBlock;
isReading=YES;
[self beginScan];
}
-(void)writeMessage:(NFCNDEFMessage *)message ToTagWithSuccessBlock:(NFCWriteSuccessBlock)writeSuccessBlock andErrorBlock:(NFCWritErrorBlock)writErrorBlock{
self.message=message;
self.writeSuccessBlock=writeSuccessBlock;
self.writErrorBlock=writErrorBlock;
isReading=NO;
[self beginScan];
}
+(NFCSupportsStatus)isSupportsNFCReading{
if (@available(iOS 11.0,*)) {
if (NFCNDEFReaderSession.readingAvailable == YES) {
return NFCSupportStatusYes;
}
else{
NSLog(@"%@",@"该机型不支持NFC功能!");
return NFCSupportStatusDeviceNo;
}
}
else {
NSLog(@"%@",@"当前系统不支持NFC功能!");
return NFCSupportStatusnSystemNo;
}
}
+(NFCSupportsStatus)isSupportsNFCWrite{
if (@available(iOS 13.0,*)) {
if (NFCNDEFReaderSession.readingAvailable == YES) {
return NFCSupportStatusYes;
}
else{
NSLog(@"%@",@"该机型不支持NFC功能!");
return NFCSupportStatusDeviceNo;
}
}
else {
NSLog(@"%@",@"当前系统不支持NFC功能!");
return NFCSupportStatusnSystemNo;
}
}
-(void)beginScan{
if (@available(iOS 11.0, *)) {
self.session = [[NFCNDEFReaderSession alloc]initWithDelegate:self queue:nil invalidateAfterFirstRead:NO];
self.session.alertMessage = @"准备扫描，请将卡片贴近手机";
[self.session beginSession];
}
}
//获取类型名数组
+(NSArray*)getNameFormatArray{
return @[@"Empty",@"NFCWellKnown",@"Media",@"AbsoluteURI",@"NFCExternal",@"Unknown",@"Unchanged"];
}
//获取类型名字
+(NSString*)getNameFormat:(NFCTypeNameFormat)typeName{
if (typeName==NFCTypeNameFormatEmpty) {
return @"Empty";
}
else if (typeName==NFCTypeNameFormatNFCWellKnown){
return @"NFCWellKnown";
}
else if (typeName==NFCTypeNameFormatMedia){
return @"Media";
}
else if (typeName==NFCTypeNameFormatAbsoluteURI){
return @"AbsoluteURI";
}
else if (typeName==NFCTypeNameFormatNFCExternal){
return @"NFCExternal";
}
else if (typeName==NFCTypeNameFormatUnknown){
return @"Unknown";
}
else if (typeName==NFCTypeNameFormatUnchanged){
return @"Unchanged";
}
return @"";
}
//获取类型结构体
+(NFCTypeNameFormat)getNFCTypeNameFormat:(NSString*)typeName{
if ([typeName isEqualToString:@"Empty"]) {
return NFCTypeNameFormatEmpty;
}
else if ([typeName isEqualToString:@"NFCWellKnown"]){
return NFCTypeNameFormatNFCWellKnown;
}
else if ([typeName isEqualToString:@"Media"]){
return NFCTypeNameFormatMedia;
}
else if ([typeName isEqualToString:@"AbsoluteURI"]){
return NFCTypeNameFormatAbsoluteURI;
}
else if ([typeName isEqualToString:@"NFCExternal"]){
return NFCTypeNameFormatNFCExternal;
}
else if ([typeName isEqualToString:@"Unknown"]){
return NFCTypeNameFormatUnknown;
}
else if ([typeName isEqualToString:@"Unchanged"]){
return NFCTypeNameFormatUnchanged;
}
return NFCTypeNameFormatEmpty;
}
-(NFCNDEFMessage*)createAMessage{
NSString* type = @"U";
NSData* typeData = [type dataUsingEncoding:NSUTF8StringEncoding];
NSString* identifier = @"12345678";
NSData* identifierData = [identifier dataUsingEncoding:NSUTF8StringEncoding];
NSString* payload1 = @"ahttps://www.baidu.com";
NSData* payloadData1 = [payload1 dataUsingEncoding:NSUTF8StringEncoding];
if (@available(iOS 13.0, *)) {
NFCNDEFPayload *NDEFPayload1=[[NFCNDEFPayload alloc]initWithFormat:NFCTypeNameFormatNFCWellKnown type:typeData identifier:identifierData payload:payloadData1];
NFCNDEFMessage* message = [[NFCNDEFMessage alloc]initWithNDEFRecords:@[NDEFPayload1]];
return message;
} else {
return nil;
}
}
//停止扫描
-(void)invalidateSession{
if (!self.moreTag) {
[self.session invalidateSession];
}
}
#pragma mark - NFCNDEFReaderSessionDelegate
//读取失败回调-读取成功后还是会回调这个方法
- (void)readerSession:(NFCNDEFReaderSession *)session didInvalidateWithError:(NSError *)error API_AVAILABLE(ios(11.0)){
NSLog(@"%@",error);
if (error.code == 201) {
NSLog(@"扫描超时");
}
if (error.code == 200) {
NSLog(@"取消扫描");
}
}
//读取成功回调iOS11-iOS12
- (void)readerSession:(NFCNDEFReaderSession *)session didDetectNDEFs:(NSArray*)messages
API_AVAILABLE(ios(11.0)){
dispatch_async(dispatch_get_main_queue(), ^{
if (self->isReading) {
if (@available(iOS 11.0, *)) {
for (NFCNDEFMessage *message in messages) {
session.alertMessage = @"读取成功";
[self invalidateSession];
if (self.scanSuccessBlock) {
self.scanSuccessBlock(message);
}
}
}
}
else{
//ios11-ios12下没有写入功能返回失败
session.alertMessage = @"写入失败";
[self invalidateSession];
}
});
}
//读取成功回调iOS13
- (void)readerSession:(NFCNDEFReaderSession *)session didDetectTags:(NSArray<__kindof id> *)tags API_AVAILABLE(ios(13.0)) API_UNAVAILABLE(watchos, macos, tvos){
dispatch_async(dispatch_get_main_queue(), ^{
if (tags.count>1) {
session.alertMessage=@"存在多个标签";
[session restartPolling];
return;
}
id tag=tags.firstObject;
[session connectToTag:tag completionHandler:^(NSError * _Nullable error) {
if (error) {
session.alertMessage = @"连接NFC标签失败";
[self invalidateSession];
return;
}
[tag queryNDEFStatusWithCompletionHandler:^(NFCNDEFStatus status, NSUInteger capacity, NSError * _Nullable error) {
if (error) {
session.alertMessage = @"查询NFC标签状态失败";
[self invalidateSession];
return;
}
if (status == NFCNDEFStatusNotSupported) {
session.alertMessage = @"标签不是NDEF格式";
[self invalidateSession];
return;
}
if (self->isReading) {
//读
[tag readNDEFWithCompletionHandler:^(NFCNDEFMessage * _Nullable message, NSError * _Nullable error) {
if (error) {
session.alertMessage = @"读取NFC标签失败";
[self invalidateSession];
}
else if (message==nil) {
session.alertMessage = @"NFC标签为空";
[self invalidateSession];
return;
}
else {
session.alertMessage = @"读取成功";
[self invalidateSession];
if (self.scanSuccessBlock) {
self.scanSuccessBlock(message);
}
}
}];
}
else{
//写数据
[tag writeNDEF:self.message completionHandler:^(NSError * _Nullable error) {
if (error) {
session.alertMessage = @"写入失败";
if (self.writErrorBlock) {
self.writErrorBlock(error);
}
}
else {
session.alertMessage = @"写入成功";
if (self.writeSuccessBlock) {
self.writeSuccessBlock();
}
}
[self invalidateSession];
}];
}
}];
}];
});
}
//
- (void)readerSessionDidBecomeActive:(NFCNDEFReaderSession *)session API_AVAILABLE(ios(13.0)) API_UNAVAILABLE(watchos, macos, tvos){
}
@end