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.

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36 views

Idiomatic way to mutate array while using Swift dispatch groups

When keeping track of various pieces of information in a variable when using a dispatch group, I've fallen into a pattern of protecting the variable using a serial queue, and then ultimately notifying ...
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1answer
85 views

Unwrapping optionals for max of a 2D array in swift

I'm working in swift and I've got a custom class Array2D to handle fixed-width, two-dimensional arrays of integers. What I'm trying to do is write a simple, ideally-...
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iOS Core animation cancel and restart [closed]

There is a simple movement CAKeyframeAnimation, what needs is that I can cancel and restart the animation freely. The key point of the following code, is that I ...
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3answers
2k views

Create UIView programmatically in Swift

I am generating View and setting constraints programmatically in UIViewController ...
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3answers
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I want to take away WebService call from UIViewController

I am using Moya to make network calls in Swift. In my ViewController I am calling the WebService and creating a model from response. ...
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1answer
81 views

Initializing more than one instance object at a time in init method

I have a RadioStation class file and a view controller where I create two station objects based on this class, one for FM and one for AM. I created both of these ...
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1answer
92 views

Where best to declare a counter variable to track number of guesses?

An exercise asks that we extend the below random number generator app to print to the console how many times the user guessed before guessing the correct random number. I first declared what I call ...
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38 views

Using UnsafeMutableRawPointers with Metal buffers in Swift

I've some Metal buffers which I populate with geometry data. Most data consists of Floats, but the buffer also contains custom structs for the tessellation stage. I ...
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1answer
59 views

Handle HTTP and BLE requests

Im implementing and designing a workflow that performs both HTTP and BLE requests. Im having trouble figuring out the best approach to design a service to handle both types of requests, and manage ...
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2answers
411 views

100DaysofSwiftUI - Project 1 - Challenge 1: Convert temperature units: Celsius, Fahrenheit and Kelvin

This is my code to solve the challenge in 100 Days of SwiftUI by Paul Hudson. This is the first challenge in the series and I chose to convert the temperature units from C° -> F°, F° -> C°, C° -> K° ...
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1answer
600 views

Comparing two structs in Swift [closed]

Consider a struct with a name two Int values : struct StructWithNameAndTwoInts { let name: String let from: Int let to: Int } Now I want to compare ...
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45 views

Swift model for the Nevada Democratic Caucuses Feb 22 2020

Long one here, but election transparency is worth a rough code review. The Iowa Caucuses have numerous errors in delegate awards because they did their computations manually (their closed-source app ...
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1answer
102 views

refactor function so same code is written only once

I have this code ...
4
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1answer
271 views

Find minimum count of items where sum of them is X from an array

I recently faced an interview question where you have to find minimum needed items from an array that can added together to generate X value. For example giving: <...
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1answer
1k views

Dynamic Array Problem (Hacker rank)

I am trying to solve the Dynamic Array problem on HackerRank: Create a list, seqList, of N empty sequences, where each sequence is indexed from 0 to N-1. The elements within each of the N ...
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0answers
68 views

Finding the bundle of the most similar strings in an array

I used the minimum edit distance algorithm to find the bundle of the most similar strings in an array. So, I have to travel double for loop to compare all elements. ...
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2answers
138 views

Searching within a data model using an array matching multiple terms

I have a standard tableview app that displays information from a data model array that uses a custom class. There is a UISearchController to filter the data. A ...
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0answers
33 views

Manage Recent List Of user and staff type objects

So I have a view which shows recent 5 staff users and 5 customers for a restaurant app. I am storing this in user default. I am also managing the currently selected object. Here is my class. ...
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1answer
84 views

Function to generate an Int from a series of bits

I wrote the following function in order to handle some data from a QR code: ...
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0answers
354 views

Swift for flattening JSON nested objects

I am receiving JSON from a service API (Airtable) that returns an object with a single key records which is an array of objects. These objects have most of their ...
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1answer
64 views

iOS: prettify random color for debugging

iOS: prettify random color for debugging I used to use random color to debug, from colors I like ...
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1answer
37 views

iOS: configuring UI appearance and layout, use protocol to extract common code

There are many side controllers in my project, like the following images. They share the same head view appearance and layout. Use protocol to extract common code . ...
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1answer
173 views

iOS Body-Mass-Index (BMI) app

This is "homework" from a Swift course, which I'm currently taking. A mockup and the image-assets are provided by the instructor. We are supposed to create the layout and to write some appropriate ...
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1answer
201 views

Convert image to grayscale

To convert JPEG file, C function, bgraToGrayscale is called from Swift. Is there a better way to 1.allocate memory and 2.access pointers than the ways they have been done in code below? And ...
3
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1answer
356 views

Minimum window substring - LeetCode challenge

Below is my code for the “Minimum Window Substring” LeetCode problem in Swift: Given a string S and a string T, find the minimum window in S which will contain all the characters in T in complexity O(...
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2answers
120 views

Pick a two different random elements from a given closed range

I wrote a function which picks a two different random elements from a closed range of ints and returns them as a tuple. I would like to take a your feedback, if the solution is a "Clever", "Best ...
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1answer
286 views

Unit Test class from iOS

I am learning to write test cases in iOS using Swift. I was stuck at testing static functions from my Utilities class, so I ...
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2answers
102 views

Handling view state for cardview

I have two buttons 1) Chat button 2) Annotation Button On tap each view comes from bottom and when tap outside view hidden back (Please refer the screen shot) On tap On annotation On tap on ...
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2answers
86 views

Identify MOT Dates which could be in various formats

I want to significantly tidy this code as its cluttered and repetitive ...
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2answers
451 views

Using enum to create, subscript and loop an array of structs in Swift 5.0

I'm trying to "build" a few "spaceships" in my code. I'm feeling it's a good idea to enumerate all the spaceships and use that as a subscript to build and use an array that holds the spaceships' ...
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1answer
229 views

ValueAnimator for IOS - Did I butcher it up?

I am trying to make an IOS tool similar to Android's ValueAnimator... more or less This is useful for situations where you simply want a value to "animate" over time, but rather than necessarily ...
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2answers
2k views

Working with Arrays in Swift

It's an exercise from a Swift-course I'm currently taking. You are given an array of integers. Make an additional array named computedNumbers. computedNumbers should multiply each element in the ...
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1answer
59 views

UITableView, auto locate back at indexPath when user drags it

I have a tableView, which auto locates back at indexPath after user has dragged it. In other words, bouncing the tableView back into its bounds, after user dragged it out. Here is the code: ...
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1answer
93 views

Testable network calls Swift

I want to make testable network calls using Swift. For example, I want to download the latest from AWS if and only if it's version is newer than the downloaded file. In order to do this I've created ...
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0answers
40 views

Message handling: Should a test/spec do it?

I am currently implementing an app that uses an architecture based on features & usecases and message sending. Features are created with message handler passed in. To test the feature, a handler ...
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1answer
764 views

Swift protocol with lazy property requirement

First question here on CodeReview. I was directed here from a question I asked on SO: Swift protocol with lazy property - Cannot use mutating getter on immutable value: '$0' is immutable. Goal: ...
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0answers
30 views

Test a method that Swizzles in Swift [closed]

How can I test a class that Swizzles? In particular, I want to test the following: ...
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2answers
336 views

Swift main thread style

I run into issues where I forget to run UI changes on the main thread. I've just fixed an issue for loading and unloading an activity indicator and fixed it with the following code: ...
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0answers
98 views

Clean way of passing parameters in swift

I am creating a user request model to pass-params for web service call toRegisterParams() is used call register web service request toLoginParams() is used call register web service request so my ...
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2answers
361 views

Finding a perfect square smaller than an input number (Swift)

This code runs slowly, even with numbers smaller than 1,000,000. Can someone help me optimize this thing? ...
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2answers
81 views

Reducing a list of points into a list of pairs of points

I have some data… let points = [(718, 620), (4596, 1280), (410, 333), (4597, 993), (410, 337), (4597, 996), (428, 337), (4597, 1000), (431, 335), (4599, 1044)] …...
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1answer
941 views

Swift: extract string with regex and range

In Swift, I have a string like this http://mnc-hdqp.oss-cn-shanghai.aliyuncs.com/user%2Fheat%2Fdefault.jpg?Signature=2BI%2BauSvy&Expires=1568682491&OSSAccessKeyId=LTAIQ8Lif1HHVkXd Need to ...
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0answers
89 views

Convenient way to make an UIImageView ExpressibleByStringLiteral

I want to reduce boiler-plate code and write like this when developing in iOS: let imgView: UIImageView = "share_fareware_text_bg" Here is implementation code: <...
5
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1answer
578 views

Draw a spark line with SwiftUI

I am using a set of data points (currently randomly generated), and drawing a line graph inside a box: ...
4
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1answer
351 views

Parse data into an array of structs

I'd had a hard time getting this to work. I’d like to parse a file containing data and copy this data into a struct. The data file (test.dat) looks like this: <...
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0answers
45 views

Combining the text from selected TextFields into 1 TextView - Conditionally [closed]

ViewController2 (source) Has several TextFields, each with their own switches. ViewController1 (destination) Has one TextView waiting for data to be sent to it from ViewController2 (source) But i ...
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0answers
146 views

iOS Calendar Navigation and Layout

In an effort to explore how the default calendar app works and to experiment with container view controllers, I created the following mock app. See this post for more info about my motivation for this ...
3
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1answer
323 views

LinkedList Swift Implementation

Linked List Implementation in Swift Swift 5.0, Xcode 10.3 I have written an implementation for a doubly linked list in Swift. As well, I decided to make the node class private and thus hidden to the ...
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0answers
73 views

Preventing tampering with save game data (iOS)

I am creating an iOS game with In-App purchases for "Coins" and I wish to prevent (or make it very difficult) for the user to simply edit the save-game file and increase the number of "Coins" without ...
3
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1answer
84 views

UITableView allowing some kinds of requests to be deleted with swipe gestures

I have a tableview which shows a list of objects called Requests. It has 3 segments. Namely Accepted, Received and Sent. And the objects for each segment are in 3 arrays. I want to enable deleting ...

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