为您的 v0 应用接入 HealthKit 和 Health Connect

// 自定义 User-Agent: "... WebViewGold-iOS" (Config.swift), "... WebViewGold-Android" (Config.java)
var ua = navigator.userAgent;
var IN_APP = ua.indexOf("WebViewGold") !== -1;
var IS_IOS_APP = ua.indexOf("WebViewGold-iOS") !== -1;

function readSteps(callback) {
  if (!IN_APP) { callback(null); return; }              // 浏览器: 手动输入
  var key = IS_IOS_APP ? "HKQuantityTypeIdentifierStepCount" : "StepsRecord";
  window[key] = undefined;
  window.location.href = "readhealthkit://" + key;
  var tries = 0;
  var timer = setInterval(function () {
    var v = window[key];
    if (v !== undefined || ++tries > 20) {             // 最多等待约 5 秒
      clearInterval(timer);
      if (v === "Health Connect not supported") { v = undefined; }
      callback(v === undefined ? null : String(v));    // 例如 "8421.0 steps"
    }
  }, 250);
}