Apple don’t have any comprehensive pre-built GUI resources for app development, making it very hard to match the uniformed style of the iPhone or the iPad. You will need to create your own.
To help streamline your iPhone app design and development, we have put together a fairly comprehensive collection of iPhone & iPad GUI kits that will allow you to focus on developing rather than having to design everything from scratch.
Within this post you will find complete GUI kits and stencils, iPhone GUI elements and PSDs and finally a collection of the best icon-sets perfectly suited for the iPhone. (Some of the preview images are intentionally to large to show the as much of each GUI as possible).
Complete iPhone & iPad GUI Kits
This iPhone Yahoo! Design Stencil Kit version 1.0 is available for OmniGraffle, Visio (XML), Adobe Illustrator (PDF and SVG), and Adobe Photoshop (PNG).
iPhone Design Stencils – Yahoo Design Pattern Library »
This 'Ultimate Stencil' for OmniGraffle contains backgrounds, title bars, buttons, selectors, and almost all iPhone UI elements. The text is fully editable on lists, title bars, buttons, and scroll wheels and the buttons can be resized horizontally by ungrouping, resizing the middle element, and then regrouping the elements back into a single button.
Ultimate iPhone Stencil for OmniGraffle »
This OmniGraffle stencil includes standard interface components for the iPhone 3G: buttons, fields, map elements, keyboards, icons… All of the components are on a transparent background and should re-size nicely.
iPhone 3G Stencil for OmniGraffle »
Design your application for iPhone, iPod touch and iPad devices with this exhaustive set of stencils. All stencils have been originally created by hand with native OmniGraffle shapes and groups and can be scaled, resized and exported to other vector formats in Graffle.
iPad and iPhone Design (OmniGraffle) »
This PSD was constructed using vectors, so it’s fully editable and scalable. The workable screen design is formatted to 768×1024 so anything you design in the Photoshop file can easily be brought over to the SDK.
This GUI set contains almost all of the iPad UI elements, including buttons, tabs, menus, keyboard, ballons, etc… It also includes scalable and totally editable vector versions (AI).
iPad Vector GUI Elements »
iPhone GUI PSD Elements
iPhone App Dev Icon Sets
There are 160 clean and simple toolbar icons in this set designed specifically for the iPhone, with a source .psd file for futher customisation.
iPhone Toolbar Icons »
The Glyphish icon set have designed and carefully optimized specifically for use on toolbars and tab bars in iPhone apps, but would also be perfect for Android Development.
The 130 icons are 24-bit .png images are about 30×30 pixels for tab bar icons and about 20×20 pixels for toolbar and navigation icons.
This set of 64 icons for the iPhone toolbar that contain beautiful shaded portions to give added depth and to highlight the icon features.
iPhone Toolbar Icon Set »
These icons have been developed specifically for iPhone developers, completely free for anyone to use commercially under the Creative Commons Attribution 2.5 Canada license.
Free iPhone Toolbar Icons »
iconSweets is a free icon set containing 60 vector Photoshop shapes, influenced by icon sets such as Glyphish and Pictoico. Perfectly suitable for iPhone & iPad app development.
Vectorized version of Dan Saffer's "Touchscreen Hand Gestures" stencil (http://graffletopia.com/stencils/432) containing a collection of drawn hands for documenting touchscreen interactions.
Touchscreen Hand Gestures v2 (OmniGraffle) »
These vector based icons have been created to help in the design, development, implementation and promotion of multi-touch interfaces. You can use Gesturecons inside of your applications in order to demonstrate to users how to complete actions or prompt them to interact with an application when they approach it. You can scale them to any size and alter them in any way you wish.
Within the download package there are 52 high resolution vector icons entirely scalable and alterable (.pdf, .ai, .eps file types.).
Gesturecons – Multi-Touch Icons »