Develop a grid system UI on iPhone

Develop a grid system UI on iPhone We would like to build a A grid system should have the following features: - Cover: first photo /video as background, overlay a title at the bottom. - Content made of a list of items. An Item can be a text, photo or video. - An item should consist of a starting position (x, y), width and height. - Item can be dragged and dropped to other position - Grid system: • One row consists of 6 grids • Text fills up one row • Photo occupies at least 2x2 grids • Video occupies at least 4x2 grids • Margins between two items - Text: • Can be edited with text editor (basic functions: text style, alignment) or deleted - Photo: • Can be resized, cropped or deleted • When the width reaches the border, photo will fill up the whole row, same width and height as the photo - Video: • Same as photo, except cropping • Auto-play video if it is the first video in view (optional) UI effects: Cool UI flow: 1. Choose photos / videos from gallery 2. Create page with magazine layout 3. Can add text, multiple photos / video. Newly added items are put to the top of the item list. Device: iPhones ( No need to support tablet) Support 7.0+ Programming language: Objetive-c If 3rd party library is used, make sure it has MIT or apache license. UI only. No server code needed.