After I set up an Amazon EC2 Ubuntu Linux server, I can only access it with ssh command. But I really need the GUI interface to browse the ubuntu server easily. After investigating, I finally find the below method of how to enable the XServer on the amazon EC2 Ubuntu Linux server and how to […]
How To Setup GUI For Amazon EC2 Ubuntu Linux Instance Read More »
After installing Ubuntu in VirtualBox and log in to the Ubuntu OS, I find the ubuntu os screen resolution is configured at 800*600, this is not a good screen resolution for usage. I want to change it to at least 1920*1080. After investigate I finally find the method to change it.
How To Change Screen Resolution After Install Ubuntu In VirtualBox Read More »
Decorators can add new functions or restrictions to the decorated objects without modifying the original source code. There are many kinds of decorators, including function decorators and class decorators. The name of decorator is different in many programming languages. It embodies the decoration pattern in the design pattern and emphasizes the open and closed principle.
What Is Decorator In Python With Example Read More »
This article will tell you how to install a python interpreter in the PyCharm project. Before start, you should make sure you had installed python on your system.
How To Install Python Interpreter In PyCharm Read More »
When I use eclipse to open an existing PyDev project, I find an error message like Unresolved import: smtplib. This error means the python3 built-in library smtplib can not be found and imported in python source code now. This error is because the python interpreter is not configured correctly, now I will tell you how
How To Fix Unresolved Import Issues In Eclipse PyDev Project Read More »
WebKit.WKWebView class is used to implement a micro web browser in the iOS app or Mac OS app. It provides several methods to load Html URL pages, local Html files, etc. But when I use it to load and display the Html page in iOS version 9 and later, I find it can not display
How To Fix Swift WKWebView Do Not Load URL Page Error Read More »
This example will tell you how to add and use the iOS UISegmentedControl object both in the Main.storyboard visually and programmatically in swift source code. There are two UISegmentedControl objects on the app screen. The above one is added to the Main.storyboard visually, when click it’s item, it will display the item title or image
How To Use iOS UISegmentedControl In Swift Programmatically Example Read More »
We have introduced how to use UITextField and UITextView in the article iOS UITextField And UITextView Swift Example. In that article, we use interface builder and storyboard to create the user interface, assign delegate protocol to the view controller, implement delegate methods to respond to user action ( for example: begin editing a text field,
How To Use UITextField And UITextView In Swift Programmatically Example Read More »
When you create an iOS 13 project in Xcode 11 use a single view app template, you will find Xcode 11 add a SceneDelegate.swift file automatically beside the AppDelegate.swift file. It defines a SceneDelegate class in the SceneDelegate.swift file, and this class takes over some UI life cycle functions which are implemented by AppDelegate class
Swift Xcode 11 iOS 13 Scene Delegate Life Cycle Example Read More »
When I develop an iOS project in Xcode, I create a custom class RootViewController in RootViewController.swift file, this class is a subclass of UIViewController. But during the development process, when I use this custom class to create an object in another swift file ( for example SceneDelegate.swift ), I meet an error which said Use