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
《地理信息系统原理、技术与方法》  97

最近几年来,地理信息系统无论是在理论上还是应用上都处在一个飞速发展的阶段。 GIS被应用于多个领域的建模和决策支持,如城市管理、区划、环境整治等等,地理信息成为信息时代重要的组成部分之一; “数字地球”概念的提出,更进一步推动了作为其技术支撑的GIS的发展。 与此同时,一些学者致力于相关的理论研究,如空间感知、空间数据误差、空间关系的形式化等等。 这恰好说明了地理信息系统作为应用技术和学科的两个方面,并且这两个方面构成了相互促进的发展过程。