Swift

Notes for Swift/SwiftUI and somethings about Apple platform. (Maybe change name in future)

Latest

• How to Set Options and Arguments of Command Line Programs in Xcode via Scheme

  2025-03-22 ｜ #Words: 287

  You could test the program in a separate terminal, but this is cumbersome. Instead, you can set options and arguments directly by modifying the Xcode Scheme—this eliminates the need to retype commands (or switch windows and use arrow keys) every time you run the program.

• Swift Command Line Development on macOS: Fix "Undefined Symbols for Architecture x86_64" Linker Error

  2025-03-22 ｜ #Words: 458

  However, given the small size of the core development team, their focus remains on Apple’s Xcode and GUI development. When working outside of Xcode and GUI environments, various odd issues may arise. I plan to publish several blog posts covering these issues in the coming days.

• Swift Error: "main attribute cannot be used in a module that contains top-level code"

  2025-03-22 ｜ #Words: 264

• How to convert number from some base to other base in Swift

  2023-06-12 ｜ #Words: 323

  Finally I found the `String` type has a particularly magical method, like: String(a, radix: 16, uppercase: true)

• How to convert an array into a dictionary in Swift

  2023-04-22 ｜ #Words: 570

  Sometimes you need to convert array subscripts and elements into a dictionary. For example, if you use array elements to search for subscripts, if you use a function to search, you have to perform a loop search and acquisition every time, which requires a lot of computing performance and memory. At this time, convert the original array into a dictionary, keyword For array elements, it would be more convenient if the value is a subscript serial number, so that the serial number can be easily found through the value of the element, and there is no need to perform a loop search every time.

• How to measure running time of function in Swift/SwiftUI

  2023-04-02 ｜ #Words: 973

  Sometimes, Xcode Test cannot meet our need, so we need to write the testing function mannully. The main of testing function is measure time of code. Whether it is testing a CPU/GPU-intensive program or a read-write-intensive program, it is necessary to obtain the running time of the program or function to calculate performance.

• New Navigation mode in SwiftUI from iOS 16

  2022-11-24 ｜ #Words: 608

  From iOS 16, Apple start to deprecate the original `NavigationView` and will gradually phase it out completely in the future. Apple start to use `NavigationStack` and `NavigationSplitView`.

• How to grant different permissions of Safari Extension

  2022-10-25 ｜ #Words: 823

  ZhongUncle will introduce how to grant different permissions of Safari Extension, like types, domains, kinds.The permissions of Safari Extension extensions are roughly divided into the following aspects:

• How to use the built-in native charts (Charts) in SwiftUI

  2022-09-23 ｜ #Words: 3101

  At WWDC2022, Apple provided the chart-related package `Charts` for SwiftUI, so you don’t have to work hard to implement the chart function yourself. The amount of code suddenly changed from four to five hundred lines to a dozen or even a few lines (I still remember that I almost vomited blood trying to write the chart function). So I want to study the built-in chart function carefully, so as to facilitate future development and use

• How to product new UI animation after iOS 15 using SwiftUI

  2022-08-13 ｜ #Words: 1375

  Starting from iOS 15.0, Apple has abandoned the previous.animation(Animation?) and recommends developers to use .animation(Animation?, value: Equatable) or withAnimation instead.Personally, I feel that although I may not be used to it after the revision, the possibilities and freedom of development are greater.But before talking about the difference between the two, we need to understand UI animation. You can skip this part if you understand it.What is animation.Animation is a process of attribute changes such as various displacements, color changes, size changes, etc.Specific to SwiftUI's View, it is their .offset, .foregroundC

• Jump between Views in SwiftUI (How to jump to other page)

  2022-07-17 ｜ #Words: 1392

  ZhongUncle introduces how to jump to other pages and views in SwiftUI. I shows two methods and new method after iOS 16.Since it jumps page by page, so it is not suitable for jumping between some pages

• How Swift parses URLs

  2022-07-08 ｜ #Words: 133

  ZhongUncle introduces how to use Swift to parses URLs.

• How to modify TabView in SwiftUI

  2022-03-23 ｜ #Words: 2953

  How to modify TabView in SwiftUI (including properties of tabItem), such as color, position, size, etc.

• How to delay execution or scheduled automatic operations in SwiftUI

  2022-03-14 ｜ #Words: 1005

  In the process of developing software, we not only need to perform operations when the user clicks, but sometimes we also need to automatically perform some operations at regular intervals. For example, the most common opening screen advertisement countdown is closed, as well as some animation effects. There are generally two ways to implement these: one is to use a timer, and the other is to use asynchronous operations.

• How to use Core Image filter (CIFilter) to process photos in SwiftUI

  2022-02-22 ｜ #Words: 959

  Apple provides 14 major categories, a total of 174 image processing methods and some common filters in the Core Image API. The first is how to read this web page, that is to say what information this web page provides, which is very helpful for us when using it. Take the screenshot below as an example to explain how to see it.

• How to Handle Push Notifications in SwiftUI

  2022-02-21 ｜ #Words: 1081

  There are many situations need developers to push notifications, but not many people talk about push notifications in SwiftUI. Here is some relevant content, So I write this blog. On the one hand, I can refer to it in future, on the other hand, I also want to help people in need.

• How to get get JSON by website api and displays content in SwiftUI

  2022-02-11 ｜ #Words: 1390

  Obtaining JSON from the website API and displaying the text is a very common usage scenario in development.

• How to obatin the size of a View in SwiftUI

  2022-01-20 ｜ #Words: 324

  ZhongUncle introduce how to obatin the size of a View in SwiftUI. You can get height or width of a View component.

• How to modify the size of SF Symbol in SwiftUI

  2022-01-11 ｜ #Words: 234

  Apple provides many symbols to developers, which improves developer efficiency and unifies the usage of many symbols to avoid misunderstandings. These synbols are called as SF symbols. Apple provides an App for developers to find these symbols, also called SF Symbol, which can be found on the Apple Developer website

• How to call the camera in SwiftUI

  2021-12-10 ｜ #Words: 695

  SwiftUI cannot directly call the camera and photo album, it needs to be used together with UIKit.

• How to get images from the system album in SwiftUI

  2021-12-10 ｜ #Words: 608

  I will tell you how to get images or photos from the system album in SwiftUI. SwiftUI cannot obtain the system album content by itself, so it has to rely on UIKit.

• How to obtain information of device, system and battery in Swift.

  2021-04-03 ｜ #Words: 420

  ZhongUncle introduces how to obtain information of device, system and battery in Swift.