[Warning] Native: tried calling Diagnostic.requestRuntimePermissions, but the Diagnostic plugin is not installed.

[xingkoo]

I'm submitting a ... (check one with "x")

[ ] bug report
[ ] feature request
[X ] support request

Related code:
/src/pages/ionic-native/runtime-permissions/runtime-permissions.ts

  // You can use this kind of method, which is passing a permission value..
  requestPermission(permission) {
    this.diagnostic.requestRuntimePermission(permission).then((status) => {
      if (status === this.diagnostic.permissionStatus.GRANTED) {
        alert('Permission granted!');
      } else {
        alert('Permission not granted. STATUS: ' + status);
      }
    }, error => {
      console.error('permission error:', error);
    });
  }

  // There is also a method that takes an array of permissions to ask for them at once
  requestAllPermissions() {
    const permissions = Object.keys(this.PERMISSION).map(k => this.PERMISSION[k]);
    this.diagnostic.requestRuntimePermissions(permissions).then((status) => {
      alert(JSON.stringify(status));
    }, error => {
      console.error('permission error:', error);
    });
  }

Important information:

hi,
diagnostic.requestRuntimePermissions and diagnostic.requestRuntimePermissionss only support platform android?

see https://www.npmjs.com/package/cordova.plugins.diagnostic#requestruntimepermissions

we try run this app on ios,

[Warning] Native: tried calling Diagnostic.requestRuntimePermissions, but the Diagnostic plugin is not installed. (vendor.js, line 184286)
[Warning] Install the Diagnostic plugin: 'ionic cordova plugin add cordova.plugins.diagnostic' (vendor.js, line 184286)
[Error] permission error: – "plugin_not_installed"