How to use react-native-nfc-manager - 10 common examples

console.warn('start fail', error);
                this.setState({supported: false});
            })

        if (Platform.OS === 'android') {
            NfcManager.getLaunchTagEvent()
                .then(tag => {
                    console.log('launch tag', tag);
                    if (tag) {
                        this.setState({ tag });
                    }
                })
                .catch(err => {
                    console.log(err);
                })
            NfcManager.isEnabled()
                .then(enabled => {
                    this.setState({ enabled });
                })
                .catch(err => {
                    console.log(err);
                })
            NfcManager.onStateChanged(
                event => {
                    if (event.state === 'on') {
                        this.setState({enabled: true});
                    } else if (event.state === 'off') {
                        this.setState({enabled: false});
                    } else if (event.state === 'turning_on') {
                        // do whatever you want
                    } else if (event.state === 'turning_off') {
                        // do whatever you want

for (let i = 0; i < NfcManager.MIFARE_BLOCK_SIZE; i++) {
            data.push(0);
          }

          // Fill the block with our text, but don't exceed the block size
          for (let i = 0; i < this.state.textToWrite.length && i < NfcManager.MIFARE_BLOCK_SIZE; i++) {
            data[i] = parseInt(this.state.textToWrite.charCodeAt(i));
          }

          return NfcManager.mifareClassicWriteBlock(block, data);
        })
        .then(read)
    };

    this.setState({ isDetecting: true });
    NfcManager.registerTagEvent(tag => console.log(tag))
      .then(() => NfcManager.requestTechnology(NfcTech.MifareClassic))
      .then(() => NfcManager.getTag())
      .then(tag => {
        this.setState({ tag });
        return NfcManager.mifareClassicGetSectorCount();
      })
      .then(sectorCount => {
        this.setState({ sectorCount });
      })
      .then(() => {
        let sector = parseInt(this.state.sector);
        if (isNaN(sector)) {
          this.setState({ sector: '0' });
          sector = 0;
        }

console.log('launch tag', tag);
                    if (tag) {
                        this.setState({ tag });
                    }
                })
                .catch(err => {
                    console.log(err);
                })
            NfcManager.isEnabled()
                .then(enabled => {
                    this.setState({ enabled });
                })
                .catch(err => {
                    console.log(err);
                })
            NfcManager.onStateChanged(
                event => {
                    if (event.state === 'on') {
                        this.setState({enabled: true});
                    } else if (event.state === 'off') {
                        this.setState({enabled: false});
                    } else if (event.state === 'turning_on') {
                        // do whatever you want
                    } else if (event.state === 'turning_off') {
                        // do whatever you want
                    }
                }
            )
                .then(sub => {
                    this._stateChangedSubscription = sub; 
                    // remember to call this._stateChangedSubscription.remove()
                    // when you don't want to listen to this anymore

.then(block => {
          // Create 1 block
          let data = [];
          for (let i = 0; i < NfcManager.MIFARE_BLOCK_SIZE; i++) {
            data.push(0);
          }

          // Fill the block with our text, but don't exceed the block size
          for (let i = 0; i < this.state.textToWrite.length && i < NfcManager.MIFARE_BLOCK_SIZE; i++) {
            data[i] = parseInt(this.state.textToWrite.charCodeAt(i));
          }

          return NfcManager.mifareClassicWriteBlock(block, data);
        })
        .then(read)

.then(block => {
          // Create 1 block
          let data = [];
          for (let i = 0; i < NfcManager.MIFARE_BLOCK_SIZE; i++) {
            data.push(0);
          }

          // Fill the block with our text, but don't exceed the block size
          for (let i = 0; i < this.state.textToWrite.length && i < NfcManager.MIFARE_BLOCK_SIZE; i++) {
            data[i] = parseInt(this.state.textToWrite.charCodeAt(i));
          }

          return NfcManager.mifareClassicWriteBlock(block, data);
        })
        .then(read)

const write = () => {
      return NfcManager.mifareClassicSectorToBlock(parseInt(this.state.sector))
        .then(block => {
          // Create 1 block
          let data = [];
          for (let i = 0; i < NfcManager.MIFARE_BLOCK_SIZE; i++) {
            data.push(0);
          }

          // Fill the block with our text, but don't exceed the block size
          for (let i = 0; i < this.state.textToWrite.length && i < NfcManager.MIFARE_BLOCK_SIZE; i++) {
            data[i] = parseInt(this.state.textToWrite.charCodeAt(i));
          }

          return NfcManager.mifareClassicWriteBlock(block, data);
        })
        .then(read)
    };

_startDetection = () => {
        NfcManager.registerTagEvent(this._onTagDiscovered)
            .then(result => {
                console.log('registerTagEvent OK', result)
            })
            .catch(error => {
                console.warn('registerTagEvent fail', error)
            })
    }

_runTest = textToWrite => {
        const cleanUp = () => {
            this.setState({isTestRunning: false});
            NfcManager.closeTechnology()
            NfcManager.unregisterTagEvent();
        }

        const parseText = (tag) => {
            if (tag.ndefMessage) {
                return NdefParser.parseText(tag.ndefMessage[0]);
            }
            return null;
        }

        this.setState({isTestRunning: true});
        NfcManager.registerTagEvent(tag => console.log(tag))
            .then(() => NfcManager.requestTechnology(NfcTech.Ndef))
            .then(() => NfcManager.getTag())
            .then(tag => {
                console.log(JSON.stringify(tag));
            })
            .then(() => NfcManager.getNdefMessage())
            .then(tag => {
                let parsedText = parseText(tag);
                this.setState({tag, parsedText})
            })
            .then(() => NfcManager.writeNdefMessage(buildTextPayload(textToWrite)))
            .then(cleanUp)
            .catch(err => {
                console.warn(err);
                cleanUp();
            })

_startNfc = () => {
    NfcManager.start()
      .then(() => NfcManager.isEnabled())
      .then(enabled => this.setState({ enabled }))
      .catch(err => {
        console.warn(err);
        this.setState({ enabled: false });
      });
  };

_startNfc() {
        NfcManager.start({
            onSessionClosedIOS: () => {
                console.log('ios session closed');
            }
        })
            .then(result => {
                console.log('start OK', result);
            })
            .catch(error => {
                console.warn('start fail', error);
                this.setState({supported: false});
            })

        if (Platform.OS === 'android') {
            NfcManager.getLaunchTagEvent()
                .then(tag => {
                    console.log('launch tag', tag);