Develop iPhone App

Hi, We are looking for a programmer to code a native iPhone app. It is a simple straightforward app to time a power nap, with count-down and alarm functions. We already have the design, so we only need the coding. The app shall be available in two version: one version with ad-banner and an ad-free version. The app has one main screen, divided in a top and bottom half (relative to the entire screen in ad-free version; relative to screen above ad in ad-banner version). Image as start button on top half; adjustable timer on bottom half. Timer shall be adjustable by clicking arrows above/below the timer, and by a numeric keypad which pops up on clicking on the timer. On starting the count-down, the start button shall slide away and the color in the top half of the screen shall fade to a different color. Time left shall be indicated in the bottom part by the timer as well as visually in the top part of the screen by a sliding button. When the count-down function is active, clicking on the top-half of the screen must open a pop-up window with the following options: stop alarm, reset count-down, pause count-down. The count-down function and the alarm shall also work when the phone switches to standby mode or the app is left. When the user turns on the phone after switching to standby or opens the app again, the screen must display the app screen with the current count-down time. At the end of the count-down the alarm shall sound and the original start button image shall reappear. The user must now have the options to postpone the alarm (snooze; by clicking on the start button, which disappears again when clicked), or turn off the alarm (pressing on start button for two seconds, which triggers a popup screen where the user is asked to confirm to cancel the count-down). The user must be able to choose the audible alarm from some standard ringtones (to be supplied by developer), but also from his own music on his phone. The user must be able to turn on music or background sounds that will be played during the nap. Apart from a few sounds that will be provided in the app (forest, beach, creek, rain, white noise (all to be supplied by developer); repeated till end of nap), the user must be able to choose his own music from his phone (playlist of multiple files; repeated till end of nap). Settings shall be adjustable through the settings screen (opened by pressing a cog-wheel button in the lower right corner): default timer settings (minutes:seconds-format or hours:minutes:seconds-format; default nap time), alarm mode (audible, vibrating, or both), alarm ringtone, snooze duration, background sound. Pressing the info-button (lower left corner) shall open a popup screen with the following options: buy premium version (only in version with ad-banner; link to buy ad-free version), restore purchases (functionality to restore ad-free version), rate app and feedback. The ad-version app shall have an ad-banner displayed below the timer (ads through StartApp). When the user opens the app for the first time, he shall get a short explanation of the app. The design (layout, color codes, and images to be implemented) will be provided to you on assignment of the project. The project is fixed price, with payment after delivery and approval of the app.