I have a HTML list of about 500 items and a "filter" box above it. I started by using jQuery to filter the list when I typed a letter (timing code added later): $('#filter').keyup( function() { var jqStart = (new Date).getTime(); var search = $(this).val().toLowerCase(); var $list = $('ul.ablist > li'); $list.each( function() { if ( $(this).text().toLowerCase().indexOf(search) === -1 ) $(this).hide(); else $(this).show(); } ); console.log('Time: ' + ((new Date).getTime() - jqStart)); } ); However, there was a couple of seconds delay after typing each letter (particularly the first letter). So I thought it may be slightly quicker if I used plain Javascript (I read recently that jQuery's each function is particularly slow). Here's my JS equivalent: document.getElementById('filter').addEventListener( 'keyup', function () { var jsStart = (new Date).getTime()...
A simple example:
ReplyDelete//Init location manager
CLLocationManager* locationManager = [ [ CLLocationManager alloc] init];
CLLocationManager* locationManager.delegate = self; //we must implement the protocol
//Choose your accuracy level
//To turn on gps (if it isn't on already)
[locationManager startUpdatingLocation];
//To turn gps off (if no other apps are listening)
[locationManager stopUpdatingLocation];
There is more than this, and you can monitor more or less accuracy, and even use wifi/ cell towers. Please read the example first for best usage.
Well the GPS will be turned on if you use the CLLocationManager.
ReplyDeleteThe locationmanager will first start by getting the location via triangulation and then turn the GPS to get a more precise fix.