Questions tagged [swift]
Swift is a multi-paradigm, compiled programming language developed by Apple for iOS and OS X development.
574
questions
3
votes
1answer
51 views
Minimum window substring – LeetCode
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 ...
0
votes
0answers
11 views
how to switch views in Swift from a Button(action: {}) {} or DispatchQueue.main.asyncAfter() or others? [closed]
I am trying to programmatically change views in my macOS application. I
found stuff like NavigationLink and others but I am not allowed to use them. The code to switch must be in Button's action, ...
3
votes
2answers
86 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 ...
1
vote
1answer
62 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 ...
2
votes
2answers
55 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 ...
2
votes
2answers
72 views
Identify MOT Dates which could be in various formats
I want to significantly tidy this code as its cluttered and repetitive
...
1
vote
2answers
18 views
How to use enum to create, subscript and loop an array of structs in Swift 5.0
I'm relatively new to Swift - I hope this question is not too obvious.
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 ...
3
votes
1answer
64 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 ...
2
votes
2answers
114 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
...
2
votes
1answer
53 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:
...
2
votes
1answer
72 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 ...
0
votes
0answers
45 views
Test A Swizzling Swift method
I've a method that swizzles out the the localization bundle for another put in the project build. It works great:
...
1
vote
0answers
37 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 ...
3
votes
1answer
91 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: ...
1
vote
0answers
24 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:
...
4
votes
2answers
124 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:
...
1
vote
0answers
87 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 ...
4
votes
2answers
180 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?
...
4
votes
2answers
65 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)]
…...
1
vote
1answer
62 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 ...
2
votes
0answers
50 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
votes
1answer
174 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:
...
0
votes
0answers
27 views
Sending callback using RxSwift from UITableViewCell to UIViewController
I have a UITableViewCell in which I have customContentView on tap of that view I want to send a call back to the ...
4
votes
1answer
79 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:
<...
1
vote
0answers
42 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 ...
1
vote
0answers
75 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
votes
1answer
193 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 ...
1
vote
0answers
57 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
votes
1answer
74 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 ...
2
votes
1answer
60 views
FizzBuzz with more parameters in Swift
Here's my approach to an extensible version of the FizzBuzz challenge in Swift (so one can add more numbers to be checked against other than just 3 and ...
3
votes
1answer
48 views
Determine fragment identifier from HTML page in Swift
For an iOS app which helps me rolling back vandalism on Stack Exchange, I have a piece of Swift code which downloads a revision page (example) and tries to find the 'spacer' fragment just above a ...
3
votes
1answer
55 views
Generic Fenwick Tree
A Fenwick Tree, or a Binary Indexed tree, is an interesting data structure that can efficiently update its elements. You can read more about it in this paper.
Here is a generic implementation of a ...
2
votes
1answer
109 views
Cookie Clicker Game
I'm getting into Swift iOS development, and decided to create a Cookie Clicker application as a first attempt. Since I am very new with Swift, I would like feedback and criticism on everything ...
3
votes
2answers
141 views
Implement The Singleton Pattern for Persistency managers Swift [closed]
I am creating an iOS app and I want to implement Singleton Pattern.
I have created "Singleton" LibraryAPI to act as an entry point UserManager object to get data from web API. after that I used a ...
2
votes
0answers
41 views
check condition with userdefaults value exist or not [closed]
I am check first time userDefaults will not save value return 0 else get value from userDefaults
I am checking if userDefaults will not save the value, and If it ...
4
votes
0answers
60 views
Swift iOS app for showing motivational quotes, with multiple screens
I'm one month into self-learning Swift, and I would like some advice to improve my coding skills.
I have listed 2 situations that I think I need to improve. I'd like some feedback focusing on my use ...
4
votes
1answer
60 views
Basic network layer for a JSON API client
Just looking for some feedback/ways to improve this basic networking layer written in Swift. I'm still learning, please elaborate with as much detail as possible.
...
2
votes
1answer
45 views
Playing a sound depending on the currently displayed flash card image
I've developed a fully working flash card app for kids. It has a UIImageView that cycles through 26 cards (abcs) via a gesture click and a music button that will ...
3
votes
1answer
239 views
Jumping on the clouds
I have started the Hackerrank interview preparation kit. The first problem I have solved with Swift is as follows:
Emma is playing a new mobile game that starts with consecutively numbered clouds. ...
2
votes
0answers
33 views
Swift MVVM: Repositories - loading entities and dependency injection
I create a lexikon and a navigation for ZOO. I use MVVM architecture supported by ReactiveSwift. I have a few questions about my practises and whether I could write my repositories better and more ...
1
vote
0answers
24 views
Keychain unique user
I want to be able to store and retrieve a unique user throughout the app. Multiple accounts are not used. The code I have written is stated below.
This is my first attempt using KeyChain. The test ...
2
votes
1answer
113 views
Find indices of white space characters in a string
This function returns the indices of all white spaces as an array of Integer. It works fine with a small string:
...
3
votes
1answer
206 views
Create Products TableView with PAGINATION and LIKE product feature in RxSwift MVVM
I have tried to develop a simple product listing app in RxSwift with MVVM design pattern. I have managed to achieve it but I need someone to review my code, such as:
Have I followed the proper ...
0
votes
0answers
32 views
Making Oauth request asynchronously, with retry if token has expired
I'm struggling with asynchronous code. Does anyone have suggestions of a better way to do the following?
What I'm doing: hitting an API (google's, actually), with a call that might get a 401 if the ...
1
vote
1answer
69 views
Sequence for Pre-order traversal of Binary Trees
I wanted to make a Sequence that can do a pre-order traversal of Binary Tree. Doing so provides automatically unlocks wonderfully useful methods, like ...
5
votes
2answers
153 views
Splitting an amount of money equally between a group of people
I'm building a clone banking app at the moment, and one of the things I'm trying to do is add Split Transaction (which can then be shared with a set of friends paying a given amount each).
Initially, ...
4
votes
1answer
78 views
Force-unwrapped property as a contract
I have a class, which is meant to show a full screen modal controller with a set of actions (apart from actions it also has some static content, a lot of labels and images which are irrelevant, so I ...
3
votes
1answer
94 views
Core Data Wrapper
I built a wrapper in Swift to practice CoreData.
My question is more general, I hope this is acceptable. I wanted to know whether my implementation of this wrapper is correct or poorly implemented ...
5
votes
1answer
69 views
Enum for handling network request errors in Swift
I'm working on a new API written in Swift 5 and I wanted to play with the new Result. I wanted to know what you guys think about this syntax:
...
3
votes
1answer
78 views
Implementation of a property and a corresponding animated setter
There a various examples in UIKit where a class has a property and a corresponding method to set the property along with an animated property.
Examples include the ...
