iOS: NFC拉起微信小程序

一: 申请微信小程序NFC的URL Scheme

直达链接:https://developers.weixin.qq.com/miniprogram/dev/framework/open-ability/NFC.html

二: 换起NFC功能

   @property (strong, nonatomic) NFCTagReaderSession *session;
   if (NFCTagReaderSession.readingAvailable == NO) 
          [GHLoadingView showPopViewMessage:@"该机型不支持NFC功能!" success:NO andDismissTime:0.5];
          return;
      }
    self.session = [[NFCTagReaderSession alloc] initWithPollingOption:(NFCPollingISO14443 | NFCPollingISO15693 | NFCPollingISO15693) delegate:self queue:dispatch_get_main_queue()];
    self.session.alertMessage = @"查找卡片，请将卡片靠近手机";
    [self.session beginSession]; //开始识别 弹出识别提示框

三: 写入数据

#pragma mark --- NFCTagReaderSessionDelegate ---
- (void)tagReaderSession:(NFCTagReaderSession *)session didDetectTags:(NSArray<__kindof id<NFCTag>> *)tags API_AVAILABLE(ios(13.0)) {
    
    id<NFCMiFareTag> cuurentTag = [tags firstObject];
    id<NFCMiFareTag> mifareTag = [cuurentTag asNFCMiFareTag];
    if (mifareTag.type != NFCTagTypeMiFare){
        [self invalidateSessionWitgMsg:@"NFC类型不可用" success:NO];
        return;
    }
    // 先建立连接
    MJWeakSelf
    [self.session connectToTag:mifareTag completionHandler:^(NSError * _Nullable error) {
        // 获取卡片状态：判断是否可以写入
        if (error){
            [weakSelf invalidateSessionWitgMsg:@"NFC连接失败" success:NO];
            return;
        }
        [cuurentTag queryNDEFStatusWithCompletionHandler:^(NFCNDEFStatus status, NSUInteger capacity, NSError * _Nullable error) {
            // 写入
            if (status != NFCNDEFStatusReadWrite) {
                [weakSelf invalidateSessionWitgMsg:@"NFC无法写入" success:NO];
                return;
            }
            NSMutableArray *nfcArray = [NSMutableArray arrayWithCapacity:2];
            {
                NSString *type = @"U";
                NSData *typeData = [type dataUsingEncoding:NSUTF8StringEncoding];
                NSString *identifier = @"1001";
                NSData *identifierData = [identifier dataUsingEncoding:NSUTF8StringEncoding];
                NSString *payloadStr = @"URL Scheme";
                NSData *payloadData = [payloadStr dataUsingEncoding:NSUTF8StringEncoding];
                Byte byte[] = {0x00};
                NSData *data = [NSData dataWithBytes:byte length:1];
                NSMutableData *tmpData = [[NSMutableData alloc] init];
                [tmpData appendData:data];
                [tmpData appendData:payloadData];
                NFCNDEFPayload *NDEFPayload = [[NFCNDEFPayload alloc] initWithFormat:NFCTypeNameFormatNFCWellKnown type:typeData identifier:identifierData payload:tmpData];
                [nfcArray addObject:NDEFPayload];
            }
            {
                NSString *type = @"android.com:pkg";
                NSData *typeData = [type dataUsingEncoding:NSUTF8StringEncoding];
                NSString *identifier = @"1001";
                NSData *identifierData = [identifier dataUsingEncoding:NSUTF8StringEncoding];
                NSString *payloadStr = @"com.tencent.mm";
                NSData *payloadData = [payloadStr dataUsingEncoding:NSUTF8StringEncoding];
                NFCNDEFPayload *NDEFPayload = [[NFCNDEFPayload alloc] initWithFormat:NFCTypeNameFormatNFCExternal type:typeData identifier:identifierData payload:payloadData];
                [nfcArray addObject:NDEFPayload];
            }
            NFCNDEFMessage *message = [[NFCNDEFMessage alloc] initWithNDEFRecords:nfcArray];
            [cuurentTag writeNDEF:message completionHandler:^(NSError * _Nullable error) {
                NSString *msg = error?@"NFC写入失败":@"NFC写入成功";
                [weakSelf invalidateSessionWitgMsg:msg success:error==nil];
            }];
        }];
    }];
}

四: 参数传递

如果想要实现NFC唤起小程序打开指定界面,且传入参数就得在服务端实现请求scheme
接口参数:

NSDictionary *dic = @{
        @"jump_wxa":@{
            @"query":@"code=xxx&p=xxx",
            @"env_version":@"develop",
            @"path":@"page/index"
        },
        @"model_id":model_id,
        @"sn":@"xxxxxxx"
    };

query:传入你想传的参数,必须符合url参数规则(xx=xx&xx=xx)
env_version:换起的小程序环境版本,
path:唤起的小程序指定页面路径
sn:设备的sn,可以根据实际情况传入,没有限制,比如传一个当前任务的id,同一个sn只会生成唯一的scheme
注意:在切换env_version环境的时候必须也更换sn拼接规则,不然同一个sn在开发环境生成的scheme在正式环境不会重新生成,这样会唤起开发版的小程序.sn的拼接最好写成:env_version+ID