问题现象
自定义界面扫码扫到码值后，如何连续扫码？
解决措施
rescan可以重新触发一次扫码，必须在start(viewControl, callback)方法Callback接口回调中有效，Promise方式无效。
示例：
import { BusinessError } from '@kit.BasicServicesKit';
import { hilog } from '@kit.PerformanceAnalysisKit';
import { customScan, scanBarcode } from '@kit.ScanKit';
export function startCustomScan(viewControl: customScan.ViewControl) {
try {
customScan.start(viewControl, (err: BusinessError, data: Array<scanBarcode.ScanResult>) => {
if (err) {
hilog.error(0x0001, '[Scan Sample]',
`Failed to get ScanResult by callback. Code: ${err.code}, message: ${err.message}`);
return;
}
hilog.info(0x0001, '[Scan Sample]',
`Succeeded in getting ScanResult by callback, result length: ${data.length}`);
// 从data获取扫码结果并进行业务处理
// ...
try {
// 根据需要触发一次重新扫码。调用后，会重新检测预览画面中的码图，识别成功后会触发start接口传入的callback回调返回新的扫码结果。
customScan.rescan();
} catch (err) {
hilog.error(0x0001, '[Scan Sample]', `Failed to rescan. Code: ${err.code}, message: ${err.message}`);
}
});
} catch (err) {
hilog.error(0x0001, '[Scan Sample]', `Failed to start customScan. Code: ${err.code}, message: ${err.message}`);
}
}