9. Ios

  • 9.1. IOS tutorial

    IOS is a mobile operating system developed by Apple. It was used in iPhone,iPod Touch and Apple TV in 2007. IOS evo...
    2025-10-25 13:32:30 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 was released i...
    2025-10-25 13:32:31 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 3、将找到的设备安装和打开 4、在这里会有两个项目在显示的窗口中即Xcode...
    2025-10-25 13:32:31 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 programmers wh...
    2025-10-25 13:32:30 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 are as follows:...
    2025-10-25 13:32:34 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 are re...
    2025-10-25 13:32:30 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 object B h...
    2025-10-25 13:32:32 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 as but...
    2025-10-25 13:32:30 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 follows: ...
    2025-10-25 13:32:33 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 includes the requi...
    2025-10-25 13:32:29 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. 9.11....
    2025-10-25 13:32:29 UTC
  • 9.12. The use of labels

    Tags are used to display static content, including a single line or lines. Important attribute TextAlignment TextC...
    2025-10-25 13:32:32 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 on, in the i...
    2025-10-25 13:32:32 UTC
  • 9.14. Use of the status bar

    The status bar displays key information about the device. Device model or network provider Network signal strength ...
    2025-10-25 13:32:30 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 the tit...
    2025-10-25 13:32:31 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 is as follow...
    2025-10-25 13:32:33 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.