Questions tagged [swift]
Swift is a general-purpose, multi-paradigm, compiled programming language developed by Apple Inc. for iOS, iPadOS, macOS, watchOS, tvOS, Linux, and z/OS.
660 questions
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Swift: Find neighbor-elements within an array
I need a function which finds the left and right neighbor-element within an integer-array, based upon a given index. If the given element is 0, then it shall return largest index as left neighbor. ...
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Swift for CLI tools (traversing directories, reading text files)
To compare ergonomics and performance of some languages for my hobby projects, I have written a simple lines of code counter in Swift, Go, Rust and Python. It scans a given directory tree for source ...
user292421
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Using a ViewModel in a simple SwiftUI screen with a list and API call
I'm building a SwiftUI screen that displays a list of notifications, using a ViewModel to handle state and API calls. The screen is fairly straightforward: it has a header and a paginated notification ...
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Swift - Process file with key-value pairs
I got to process a simple text-file, which contains key-value pairs. Key-value shall be separated by a tabulator.
Here's the prototype, which I figured out:
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SwiftUI NavigationSplitView three-column layout
For getting familiar with SwiftUI NavigationSplitView, I created a prototype, which implements a three-column view.
Screenshot:
Code (View):
...
- 5,042
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Class to make UserDefaults get/set easier in Swift
I created the following class to ease UserDefaults get/set within my Swift project.
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SwiftUI: Handling number-inputs via TextField (actually String)
I'm creating a Settings-form in SwiftUI. One of the expected values is a double.
I tinkered with NumberFormatter, but it didn't work well for me.
Moreover I had to find a way making invalid values ...
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Showing an audio waveform from sample audio data with user interaction for zoom in/out
I want to show an interactive audio waveform like this.
I've extracted the sample data using AVAssetReader. Using this data, I'm drawing a UIBezierPath in a Scrollview's contentView. Currently, when I ...
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Swift Arrays: Write a rotate-right function
Task:
Write a function which rotates all elements of a given array to the right.
Example: [1, 2, 3] => [3, 1, 2]
My solution:
...
- 5,042
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Swift String-extension 'countOccurrencesOfChar'
Loosely inspired by Ruby's String.count-method I wrote a similar Swift-method myself as an extension to the String-class. Then I had the idea to use a second parameter with which you can control if ...
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Swift: 'Working with double-optionals'-exercise
Task: Write a function, which receives an optional array of optional integers and returns a none-optional integer. In case the array isn't nil: Return one randomly selected integer. In case the array ...
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SwiftUI TimeUnits-Converter App
The given task is to implement a time-units app.
I guess I got the main logic right, but concerning the UI-coding there could be improvements.
Here's my code:
...
- 5,042
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Swift: Mocking a REST API-request
I have read the last two days through several tutorials about how to mock a HTTP-request against a REST API.
Finally I made a prototype for applying, what I have understood from the tutorials.
Here's ...
- 5,042
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Write a Swift-function, which computes the Digital Root
Task: Write a function, which computes the Digital Root of a given number n.
Here's the solution, which I developed:
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Lists With Generic Data Types In SwiftUI
I've written a simple list in SwiftUI that accepts a generic data type.
The goal was to make a reusable list where when an item was selected, the list would execute a callback with the selected data.
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Show a list of downloads
I've been working on a Swift project that involves a seedbox app for my NAS, and I would appreciate some feedback on the code structure and especially on the placement of my observer. I've implemented ...
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Caesar Cipher in Swift (iOS-app)
I have implemented the Caesar Cipher in Swift and incorporated it into an iOS-app.
I guess it's formally correct. Please see the attached images, which show how the usage of the app is meant.
Here's ...
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Bubble Sort as extension to Swift-Arrays
Task description:
Implement an extension for Array, which sorts the elements using the Bubble Sort-algorithm.
My implementation:
...
- 5,042
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1
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Swift-function for finding missing Integers in an array of sequential Integers
Task description:
Implement a function, which receives an array of unsorted numbers from 1 to 100. In the array zero or more numbers might be missing. The function shall return an array containing the ...
- 5,042
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1
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Swift-function: Copy directory recursively
Task description:
Implement a function, which accepts two paths: The path to a source-directory & the path to a target-directory. The function shall return true if the directory has become copied ...
- 5,042
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Implement the Swift pow(base, exp)-function yourself
Task: Implement a function, which accepts two integers and results the first number raised to the power of the second number. Both numbers have to be positive.
Examples:
The arguments 4 and 3 shall ...
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Function, which replaces consecutive white-space with a single white-space
Task-description: Implement a function, which returns a string with all consecutive whites-spaces replaced as a single-space.
Example: "a[space][space][space]b[space][space][space]c" shall ...
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Swift: Fetch XML and check it's well formed
I want to download an XML and check to see if it can be parsed at all, no schema validation.
I was thinking to write two free functions, to separate concerns and wrap them in a third, public API:
<...
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Is Palindrom-function in Swift
Task is simply to write the classic isPalindrom-function.
Here's my implementation:
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Swift-function, which checks if all letters in a string are unique
The task is writing a function, which checks if a string contains only unique characters. Means: is each character is included only one time.
Here's the solution, I have developed:
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Swift-function, which counts all occurrences of a character within a string
I wrote this function, which (shall) count all occurrences of a specified character within a given string.
...
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2
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Building a UITableView with fixed number of cells progammatically
I am building this pet project with UIKit. The App's main goal is to keep track of my daily expenses.
The AddExpenseViewController is responsible for capturing user ...
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Refactoring of this massive ViewController with a UITableView in it
I'm making an application that has a UIViewController with a UITableView in order to show the favorite users that the user of ...
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Swift - efficient array searching
I am trying to find a way to search an Int array (all numbers are > 0) and identify sequences where the sum of each element is a specific number. One element can ...
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Queue implemented using two stacks in Swift
I need your expert opinion! In fact, for a Leetcode Problem, I had to code a queue using 2 stacks. It's shown just below and functions well.
It is a pretty simple code with peek, pop, push, etc. ...
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Finding Highly Composite Numbers in Swift
This code finds highly composite numbers (numbers with more factors than any smaller number) in Swift. I'm not too familiar with Swift, I did this in python but it was too slow so I decided to try it....
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MVVM pattern in Swift
I've been coding for some time now and since I am working alone I'm not strict in my coding structure approach(bad idea) and was only focused on getting things done which resulted in MVC(MASSIVE-View-...
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Exceeded time limit on Trie search with Backtracking using Swift
I have been trying to solve Trie related problems over at leet code and came across this interesting problem 211. Design Add and Search Words Data Structure
Here is the question for convenience:
211. ...
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Leet Code 139 (Word Break) using a trie with recursion
I was attempting to solve LeetCode 139 - Word Break
Given a string s and a dictionary of strings wordDict, return
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Merge two strictly increasing sequences, without duplicates
This work is motivated by Sum of natural numbers below threshold, where several Swift solutions to Project Euler #1 (with arbitrary upper bound) are provided.
One way to think of it is to
start with ...
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Function for formatting data retrieved from a battery via Bluetooth Low Energy
I have the following function in Swift and am looking to improve the readability. The function takes from the deviceData object which holds maps of data like ...
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Using Swift Combine's .map function with external variables
I have a motionManager class which uses CMMotionManager() to send rotationRate and attitude values to a publisher in the form of a MotionValueModel.
...
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API call to list top stories using dependency injection in iOS with MVVM
I'm currently trying to find out what's the best networking architecture for MVVM applications. I couldn't find many resources and decided to go with dependency injection based architecture as per the ...
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Trie data structure in Swift lang
This is an implementation of a generic Trie DS, in Swift-lang, that is using however, for the sake of a easy example, strings.
It implements two operations, insert and search. So it can insert a text, ...
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UIImage downscale and compression
getFinalImageData(:UIImage) takes a UIImage and downscales its size dimensions (to 400 ...
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Simplify wordle logic Swift
I wrote logic for "Wordle" game but I think it's too heavy and not very readable.
Is there any way to improve it?
Simple wordle game with conditions:
1) Green colour - "G" if ...
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SwiftUI/Swift code for changing item values in an immutable struct
just wanted someone to review my code and perhaps simplify it a bit. Everything is working as expected for the moment but it seems too much code for what i'm trying to achieve. Especially the function ...
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Finding the winner of a tic-tac-toe game in Swift
Working on the problem Find Winner on a Tic Tac Toe Game, I took several hours longer than an artificial time constraint the site had for mock interview purposes. This leads me to wonder if my ...
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Checking whether two values are isomorphic in Swift
Working through a book problem
Write a function that accepts two values and returns true if they are isomorphic. That is, each part of the value must map to precisely one other, but that might be ...
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Finding the longest prefix among words in a string separated by spaces (Swift)
Solving the problem
Write a function that accepts a string of words with a similar prefix,
separated by spaces, and returns the longest substring that prefixes
all words. Sample input and output
The ...
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Understanding How To Approach A Permutational Word Search
This question is carried over from StackOverflow... First time posting here, so bear with me.
The topic is constructing a search made up of a given string, and a series of letters, where each of the ...
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Create a custom split method that keeps the delimiters in Swift
I have implemented a custom split method that replicates the original functionality of the collection's split method in Swift and keep the delimiters (element separator). After a lot of trial and ...
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Best way to do Input Validation on Swift/iOS/UIKit
I have the following form that creates a new "activity":
For which I want to enforce the following requirements:
Name => minimum # of chars: 1; maximum # of chars: 50
Description => ...
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Bank account concurrency problem Swift
I tried to implement a simple BankAccount class to practice providing a solution to the common Bank Account transaction data race problem. Reference to a description of such a problem can be found ...
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