iOS 11 Hello World Example

This article takes an iOS 11 application as an example to show developers how to create projects using Xcode 10. It also shows some functions of the iOS simulator and interface builder.

iOS Autolayout Introduction

How did you set up UI layout in older iOS application development? Write a lot of coordinate calculation code? To ensure a perfect UI effect on both the 3.5-inch and 4.0-inch screens, you sometimes have to write different coordinate calculations for each screen? But now with the iOS auto-layout function, things change for the better.

Python Immutable Objects

For mutable objects, such as a list, to operate on a list, the contents within the list will change, for example. >>> l = [‘f’, ‘e’, ‘d’] >>> l.sort() >>> ; [‘d’, ‘e’, ‘f’] What about immutable objects, like string. >>> str = ‘hello’ >>> str.replace(‘h’, ‘F’) ‘Fello’ >>> str ‘hello’ Even though the string …

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