Questions tagged [swift]

Swift is a multi-paradigm, compiled programming language developed by Apple for iOS and OS X development.

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35 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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27 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: <...
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31 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: ...
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13 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 ...
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1answer
49 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
40 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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54 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
155 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
49 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
68 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
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1answer
45 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 ...
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1answer
44 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
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1answer
50 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
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1answer
70 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 ...
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2answers
123 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 ...
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0answers
37 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 ...
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0answers
45 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
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1answer
53 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. ...
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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
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1answer
130 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. ...
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29 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 ...
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21 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
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1answer
110 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
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1answer
86 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 ...
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0answers
27 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
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1answer
65 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
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2answers
147 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
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1answer
76 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
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1answer
60 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 ...
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1answer
52 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
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1answer
73 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 ...
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1answer
54 views

Finding the most common section from the visible cells in a collection view

My goal is to determine, of all of the currently visible cells in a collection view, which section has the most visible cells. Start by getting the index paths for the visible cells: ...
3
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1answer
115 views

Swift function to find a specific set of combinations of 3 digits within a larger integer array

I asked this question on Stack Overflow and was directed here. I'm working on a function that will help me quickly find all the upper structure triads (3-note chord) that I can add to a 4-note 7th ...
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2answers
182 views

Multi-Threaded Cellular Automata Lab

I am trying to improve the performance of my cellular automata lab. I have two arrays of Doubles representing the current values and the next values. If I run the ...
4
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2answers
127 views

Translating Objective-C use of static and +(void)initialize to Swift

I am converting an old Objective-C class into Swift. My actual question is at the very end after all of the code. Here is a cut-down version of the Objective-C class: DateInfo.h: ...
3
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1answer
160 views

Splitting a long string based on its graphical presentation

I got a long string, let's call it Story. I fetch this story from a database so I don't know how long it is. I want to display this story in a view, but what if ...
1
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1answer
38 views

Calling API only once on changing segments

I am working on a screen which has segmented control and has 3 segments (year value 2019, 18, 17) and what I am doing is that on each segment click I have to reload data inside a tableview (getting ...
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4answers
470 views

Showing a welcome screen once per day

I have this method, which first basically shows a Welcome screen to user only once per day. The code I have so far is this ...
3
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1answer
192 views

Login page using RxSwift in MVVM

I am building a simple login page which will check for username before navigating to another screen and here is how I am doing the binding now. I would like to know if I am doing it right and if I am ...
2
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1answer
63 views

Table View Controller class in Swift

My TableView consists of four cells (for blacklisting categories) with a boolean property (indicated with a checkmark) and another cell with a UISwitch embedded in ...
3
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1answer
147 views

MVVM in Swift iOS

I've been implementing MVVM in Swift. I've looked at several implementations, many of which violate some aspects of MVVM and wanted to have a go with my own version that contains a Web request service....
3
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2answers
131 views

Efficient way of flat mapping a range of a multidimensional random access collection

I've recently answered a question about reading elements from an array of arrays. A way it could be interpreted is that the OP wanted to read a range that could span over multiple subarrays of the 2D ...
5
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1answer
164 views

Networking structure for Swift iOS app

I would like any constructive comments regarding the structure of this simple App that takes an API response and then displays on a table view. The URL is written in a ConstantsAPI file ...
2
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0answers
18 views

Simplifying a firestore querying function

I have this function where it queries through the database and returns a random user if the requirement is met if not then try it again. It works and all but I feel like the code could be better/...
2
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1answer
70 views

Swift Memory Cycle From Closure

I am working with closures and want to confirm that I do not have any memory leaks in my code. Below is my current code: ...
4
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1answer
67 views

Swift Prim's algorithm

Lots of Prim's algorithm implementations seem long, and rely on a priority queue implementation. If I use an adjacency matrix I can then calculate the next item to take using functional programming ...
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0answers
62 views

Swift lazy observe and mutate pattern for arrays

I am using the following pattern in my code. It works. But, it feels as though it is on the edge of what should work! Should I consider an alternative? I have an array in my class that maps an ...
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2answers
163 views

Counting sort in Swift

I have this sorting algorithm which takes an array of dictionary values: guard var imageUrlString = anyImage.value as? [String:AnyObject] else { return } I then ...
2
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2answers
137 views

Formatting a price in Swift using an extension vs. a class

I have a price as a Double, which I should format it as a String. Should I use an extension instead of classical class to ...
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3answers
236 views

Leetcode 38: The “count-and-say” sequence

38. Count and Say The count-and-say sequence is the sequence of integers with the first five terms as following: ...