UI Basics-Initial iOS development

Understanding of Storyboard File

• Used to describe the software interface
• By default, Main.storyboard is loaded when the program starts
• When loading storyboard, the controller interface that the arrows refer to is created and displayed first

Ibaction and Iboutlet

• Ibaction: The essence is void, can make the method has the function of the connection
• Iboutlet: Ability to connect attributes

The problem of the storyboard connection is easy to appear

• The method code of the connection was deleted, but the wire was not removed.
  • May occur method cannot find error
  • Unrecognized selector sent to instance
• The property code of the connection was deleted, but the wire was not removed.
  • Setvalue:forundefinedkey:] This class was not key value coding-compliant for the key

Understanding of Uiviewcontroller (Controller)

• A controller is responsible for managing a large interface
• The controller is responsible for interface creation, event handling, etc.

Class extension

• Format

  1 @interface class name () 2 /*  */3@end

• Role
  • Add additional property and method declarations for a class
  • can be written in. h and. m files

Project Properties

• Product Name
  • Software name, product name, project name

• Organization Name
  • Company name, organization name

• Organization Identifier
  • The company's unique identity
  • The company's domain name is generally anti-write, such as Com.lz

• Bundle Identifier
  • Unique identification of the software
  • Typically organization Identifier + Product Name

UI Basics-Initial iOS development