iOS8 new features screen fitting Sizeclass

iOS8 launched also has a period of time, because of time is tight, so did not go to learn the new features of iOS8,
With the launch of iphone6,6+, iOS screen adaptation is a big problem, how to successfully adapt to a variety of sizes and ipad?
Apple has given new technology to solve this problem sizeclass
Here are some of my notes on Sizeclass study, I hope to be useful to you:

1> screen adaptation of the development process
Code calculation--autoreszing (relationship between parent control and child control IOS6), AutoLayout (any control can produce a relationship iOS7), Sizeclass (iOS8)

2> sizeclass Role: iOS8 in order to solve the screen adaptation, introduced a new concept, sizeclass and this use does not need to judge the size of the screen, there is no horizontal screen and vertical screen concept, only (Compact, any,regular) concept! In Xcode new project, see the storyboard interface below the column, there is a (Wany,hany) Click will appear an optional similar nine Gongge table, this is a screen selector, you can choose different screens!  

• Just sort the screens and actually arrange the UI elements to use AutoLayout

• There is no longer a concept of the screen size, only the concept

• No longer have the concept of specific dimensions, only the concept of abstract dimensions

• The width and height are divided into 3 cases, and the combination of 3*3 is 9.
  1) Compact: tight (small)
  2) Any: arbitrary
  3) Regular: Loose (Large)
  4) symbol represents

• : Compact

• : any

• : Regular
  5) Inheritance (use as few * combinations as possible, which is likely to lead to conflict)

• 
  

• : All 8 other cases will inherit

• 
  

• : will be--\ +-Inherit

• 
  

• : will be +-\ + + Inherit
  6) Role of Sizeclass and AutoLayout
  Sizeclass: Simply classifying the screen (judging the screen)
  AutoLayout: Constrain the various elements in the screen (position \ Size)
  
  
  
  
  
  Before, writing the project is handwritten code or use storyboard controversy, as Apple's guidance finally has the answer, use SB!

iOS8 new features screen fitting Sizeclass