Apple provides new iOS design resources compatible with Photoshop and Sketch
Apple on Thursday updated the iOS Human Interface Guidelines on its Developer site to include downloadable graphical templates that help app producers understand and create software using the iOS design language.

The new UI design resources are meant to help speed up the app creation and design process while also maintaining the look and feel typical of iOS apps. According to Apple, the resources are "comprehensive and accurately depict the full range of UIKit controls, views, and glyphs available to developers using the iOS SDK."
The resources include icon and glyph production files preconfigured to "automate asset production" using Sketch slices or Adobe Generator for Photoshop CC. Two downloads are available for Photoshop and Sketch, weighing in at 133.3 megabytes and 7.1 megabytes respectively.
Within the package is an installer for the San Francisco font used throughout iOS and other Apple platforms, color swatch files, and guides for dynamic type and text styles. Templates include app screens with standard navigation controls, an iMessage template for designing sticker packs, app and iMessage icons, and glyphs for menus. A collection of UI elements are intended for use with the app templates and can be used to quickly create an app's screen layout.
Apple has also introduced four videos, providing developers with an overview of what is in the new resources package, as well as three guides covering the usage of icons and glyph templates, and how to create app design composites.

The new UI design resources are meant to help speed up the app creation and design process while also maintaining the look and feel typical of iOS apps. According to Apple, the resources are "comprehensive and accurately depict the full range of UIKit controls, views, and glyphs available to developers using the iOS SDK."
The resources include icon and glyph production files preconfigured to "automate asset production" using Sketch slices or Adobe Generator for Photoshop CC. Two downloads are available for Photoshop and Sketch, weighing in at 133.3 megabytes and 7.1 megabytes respectively.
Within the package is an installer for the San Francisco font used throughout iOS and other Apple platforms, color swatch files, and guides for dynamic type and text styles. Templates include app screens with standard navigation controls, an iMessage template for designing sticker packs, app and iMessage icons, and glyphs for menus. A collection of UI elements are intended for use with the app templates and can be used to quickly create an app's screen layout.
Apple has also introduced four videos, providing developers with an overview of what is in the new resources package, as well as three guides covering the usage of icons and glyph templates, and how to create app design composites.
Comments
You and @dysamoria both need to look at the rsrcs that are available to developers. This does not require any payment unless u decide 2 distribute apps via the App Store or Mac App Store. They could have published the HI changes sooner but I for 1 respect them waiting a while to see how they were accepted.
But I've always wondered how app developers balance between originality and adhering to standards.
When so many of the UI elements are provided by Apple, an app that follows their guidelines will often look generic.
But if you deviate, your app stands out.
https://www.google.com/search?q=designers+hate+ios+7&ie=UTF-8&oe=UTF-8&hl=en-us
This may seem humorously outdated, but the real GUI knowledge was abundant at Apple around the decades that this book was important: https://www.amazon.com/Macintosh-Human-Interface-Guidelines-Computer/dp/0201622165
Today... well, now we have the extreme aesthetic preferences of one obsessive, obscenely wealthy, white male deciding what's best for everyone else... He put the marketing department to work on the iOS 7 redesign, FFS.
http://angryartboy.blogspot.com/2016/09/the-fall-of-designer-fad-of-laziness.html?m=1
Why are you posting so little now-a-days?
Anyway, thanks for the interest. Sort of withdrawn IRL as of late, even.
Case in point: Apple has always made pricey kit; what has changed is your ability or willingness to pay for it. What most people here tend to miss is that this does not apply to the new people entering Apple's core market.
But good luck on your next platform. :-)