If you look at the official documentation, the iOS framework is the entire technology of iOS development, except that Apple classifies the technology into different frameworks to make it easier for people to call.
Of course, as far as iOS frameworks are divided into core OS, Core Services, Media, Cocoa touch four layers from the bottom to the top, you can simply understand that there are so many frames divided into four classes.
(1) The iOS framework probably introduces
iOS has a lot of development frameworks, almost 71, two years ago only 40 or so, can foresee only a growing number.
But commonly used also more than 10, such as Cfnetwork, Foundation, Uikit these, and such as Gamekit, Glkit these pertinence strong, do not develop the basic of the game.
(2) iOS framework manual download
The documentation for the framework Manual is iOS technology overview.
Visit the Apple website: Click here to check online.
You can also right-click on the PDF in the upper right corner to select download offline reading.
The document has a total of 70 pages, at the end of the document there is a framework summary, look at the following comments basically know the usefulness of this framework.
"iOS Dev-6" iOS framework as well as manuals for online reading and PDF version of iOS technology overview download