title: how to used current lat long in leaflet.map("map").setView in ionic 3
body: <pre><code>this.map = leaflet.map("map").setView([this.latitude, this.longitude], 10);
  </code></pre>
  
  <p>also used this code for get current lat long</p>
  
  <pre><code>this.geolocation.getCurrentPosition().then( pos =&gt;{ 
  
  this.latitude = pos.coords.latitude;
  this.longitude = pos.coords.longitude;
  
  }).catch(err =&gt; console.log(err));
  </code></pre>
  
  <p>but it not render 1st time in  real device. </p>