IOS NFC获取UID

IOS NFC获取UID

iOS11开放了NFC的功能，但是仅限于iPhone7和7plus上使用，下面就介绍一下它的使用。（这里我用xcode11.2，iOS13.1）

开发者证书开通nfc权限

#import <CoreNFC/CoreNFC.h>

info.plist加入下边的字段:

com.apple.adersession.formats
 数组里再加入
 NDEF

Privacy - NFC Scan Usage Description

we are going to use your nfc

一：获取UID；

Delegate为：NFCTagReaderSessionDelegate

@property (strong, nonatomic)NFCTagReaderSession *session;

@property(strong,nonatomic)id<NFCTag> cuurentTag;

 if (@available(iOS 13.0, *)) {
            self.session = [[NFCTagReaderSession alloc]
                                          
                                          initWithPollingOption:(NFCPollingISO14443 | NFCPollingISO15693 | NFCPollingISO15693) delegate:self queue:dispatch_get_main_queue()];
            } else {
                          // Fallback on earlier versions
            }

}

 if (@available(iOS 11.0, *)) {
        if (adingAvailable) {
            self.session.alertMessage = @"把卡放到手机背面";
            [self.session beginSession];//启动 Session
        } else {
            NSLog(@"此设备不支持NFC");
        }
    } else {
        // Fallback on earlier versions
    }

-(void)readerSessionDidBecomeActive:(NFCNDEFReaderSession *)session{
    NSLog(@"开始扫描");
}

-(void)tagReaderSession:(NFCTagReaderSession *)session  didDetectTags:(NSArray<__kindof id<NFCTag>> *)tags{
    NSLog(@"%@",tags);
    self.cuurentTag = [tags firstObject];
    id<NFCMiFareTag> mifareTag = [self.cuurentTag asNFCMiFareTag];
    NSData *data = mifareTag.identifier;
   NSString *string = [self convertDataBytesToHex:data];
    NSLog(@"result---%@",string);

}

- (NSString *)convertDataBytesToHex:(NSData *)dataBytes {
    if (!dataBytes || [dataBytes length] == 0) {
        return @"";
    }
    NSMutableString *hexStr = [[NSMutableString alloc] initWithCapacity:[dataBytes length]];
    [dataBytes enumerateByteRangesUsingBlock:^(const void *bytes, NSRange byteRange, BOOL *stop) {
        unsigned char *dataBytes = (unsigned char *)bytes;
        for (NSInteger i = 0; i < byteRange.length; i ++) {
            NSString *singleHexStr = [NSString stringWithFormat:@"%x", (dataBytes[i]) & 0xff];
            if ([singleHexStr length] == 2) {
                [hexStr appendString:singleHexStr];
            } else {
                [hexStr appendFormat:@"0%@", singleHexStr];
            }
        }
    }];
    return hexStr;
}

恭喜你，已经获取到了。。。