Swift Wordpress Posts Fetch Page
You need to use awesome new API of WordPress called WP REST API, which will give you all data you need in JSON format. Have a look at this url to get started: http://v2.wp-api.org/
Use this official plugin in your WordPress site: https://wordpress.org/plugins/rest-api/
Update: You do not need to install above plugin as it has been merged into WordPress core from v4.4 to onwards.