9. Ios

  • 9.1. IOS tutorial

    IOS is a mobile operating system developed by Apple. It was used in iPhone,iPod Touch and ...
    2025-10-25 12:23:52 UTC
  • 9.2. Introduction to iOS

    IOS, formerly known as iPhone OS, is a mobile operating system developed by Apple. The first version of iOS w...
    2025-10-25 12:23:53 UTC
  • 9.3. IOS Xcode installation

    1、从 https://developer.apple.com/downloads/ 下载Xcode的最新版本。 2、双击Xcode dmg文件 ...
    2025-10-25 12:23:53 UTC
  • 9.4. Introduction to Objective-C

    Objective C is used in the development of iOS, which is an object-oriented language, so it is very simple for programm...
    2025-10-25 12:23:51 UTC
  • 9.5. Create the first iPhone application

    Now let’s create a simple view application (a blank application) that runs on the iOS simulator. The steps ar...
    2025-10-25 12:23:57 UTC
  • 9.6. Brief introduction

    In iOS, action and Outlet refer to ibActions and ibOutlets, where the ib interface generator is located. All of these ...
    2025-10-25 12:23:52 UTC
  • 9.7. Delegate (Delegates) example

    Suppose object An invokes B to perform an operation, and once the operation is completed, object A must know that obje...
    2025-10-25 12:23:54 UTC
  • 9.8. What is the UI element?

    The UI element is any visual element that can be seen in our application, some of which respond to user actions, such ...
    2025-10-25 12:23:51 UTC
  • 9.9. The use of text fields

    A text field is a user interface element that gets user input through an application. A UITextfield is as fol...
    2025-10-25 12:23:55 UTC
  • 9.10. Why use different input types?

    The type of keyboard input helps us get the necessary input from the user. It removes unwanted keys and inclu...
    2025-10-25 12:23:51 UTC
  • 9.11. Button usin

    Buttons are used to handle user actions. It intercepts the touch event and sends the message to the target object. ...
    2025-10-25 12:23:51 UTC
  • 9.12. The use of labels

    Tags are used to display static content, including a single line or lines. Important attribute ...
    2025-10-25 12:23:55 UTC
  • 9.13. The use of toolbars

    We can use the toolbar to modify the view elements. For example, there are deletions, shares, replies, and so...
    2025-10-25 12:23:54 UTC
  • 9.14. Use of the status bar

    The status bar displays key information about the device. Device model or network provider ...
    2025-10-25 12:23:52 UTC
  • 9.15. The use of the IOS navigation bar

    The navigation bar contains the navigation buttons for the navigation controller. The title in the navigation bar is t...
    2025-10-25 12:23:52 UTC
  • 9.16. The use of the IOS tab bar

    It is generally used to switch between subtasks, views, or models in the same view. An example of the tab bar...
    2025-10-25 12:23:56 UTC
Principles, Technologies, and Methods of Geographic Information Systems  102

In recent years, Geographic Information Systems (GIS) have undergone rapid development in both theoretical and practical dimensions. GIS has been widely applied for modeling and decision-making support across various fields such as urban management, regional planning, and environmental remediation, establishing geographic information as a vital component of the information era. The introduction of the “Digital Earth” concept has further accelerated the advancement of GIS, which serves as its technical foundation. Concurrently, scholars have been dedicated to theoretical research in areas like spatial cognition, spatial data uncertainty, and the formalization of spatial relationships. This reflects the dual nature of GIS as both an applied technology and an academic discipline, with the two aspects forming a mutually reinforcing cycle of progress.