Questions tagged [swift]

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

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3
votes
1answer
362 views

Singleton class with custom initializer

In a Swift project, I have a class should be used as a singleton: ...
3
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2answers
649 views

LeetCode Counting Bits in Swift

I solve this problem in Swift. I am looking for a code review, thanks! Given a non negative integer number num. For every numbers i in the range 0 ≤ i ≤ num calculate the number of 1's in their ...
5
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1answer
2k views

Road to MVC: the case of Settings Table View Controller

Now that I know that MVC can help do better code, I want to make my SettingsTableViewController class conform to it. ...
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0answers
20 views

check condition with userdefaults value exist or not

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
24 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 ...
3
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1answer
356 views

Adding dragging ability to a UIView using UIKitDynamics

I recently published an iOS control/component called BJDraggable which basically, with a call of a method, enables us to drag a view within its superview boundary. ...
2
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0answers
27 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. ...
1
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1answer
37 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
64 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
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0answers
20 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 ...
3
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1answer
170 views

Design pattern: image downloads

This is an image representation of my code below: This is what they do: CellWithImageX: Subclasses of UITableViewCell. They have an image and an loading indicator....
2
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1answer
107 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: ...
2
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2answers
211 views

Tableview Subclass implementing delegate datasource

I have two view controllers which have same tableview. One is for Post and one is for Profile, which also contains a post by a user. I have decided to reuse the code, so I have created the class ...
1
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0answers
19 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 ...
1
vote
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 ...
3
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1answer
62 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 ...
5
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2answers
146 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, ...
2
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4answers
456 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 ...
1
vote
1answer
64 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 ...
0
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0answers
25 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 ...
4
votes
1answer
73 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
159 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 ...
3
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1answer
54 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
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1answer
43 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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2answers
2k views

Extending UITableViewCell to preserve UIView background color when selecting the cell

When a UITableViewCell has subviews with background color set, when setSelected(_: animated:) gets called, all the views are ...
2
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2answers
134 views

Creating an Enum with a Custom Type in Swift 4.x

I was in a code review today and someone said, "Why don't you do an enum on that?" I had started to, but conforming to a bunch of protocols seemed like a gigantic ...
3
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1answer
67 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 ...
4
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2answers
118 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
112 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 ...
2
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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: ...
1
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2answers
180 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 ...
14
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2answers
4k views

Let's play some Swift Poker

Before you can do any sort of card game, you must first write some code to define your deck of cards. One thing I've noticed in looking at some of Apple's Swift interfaces is that they very much so ...
3
votes
1answer
3k views

iOS Core Data Model with Swifty JSON

I have been using SwiftyJSON to create my models of Object in Swift. But recently, I moved to CoreData for saving the objects locally. I am new to CoreData and want to know the best practices I should ...
5
votes
1answer
572 views

Generating Phone Words in Swift

I've been playing around with some basic algorithms in Swift. Here I am trying to generate phone words, words which can be mapped from phone numbers using the characters under each digit. I was trying ...
2
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1answer
103 views

Closure implementation

I have custom cell of tableview which is used as header as well as normal cell. In custom cell I have this properties ...
2
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1answer
75 views

Codable Failure Response Handler

Suppose You have two kind of response like one for success and one for failure Success response model will looks like ...
2
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1answer
59 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 ...
2
votes
1answer
330 views

Webservice class with parser using generics

I'm currently building a small web stack in swift for use in my iOS apps. It consists of multiple components and I want to make it resource specific; To that end, I have a ...
7
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3answers
206 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: ...
3
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1answer
113 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 ...
4
votes
1answer
290 views

Notify user of credential failure and make another attempt

The below code works because of the do operator on line 24. Is there a more functional way to get the test to pass, or would you consider this an appropriate use of ...
1
vote
1answer
60 views

Damage or Heal based on the buttons you press

If you press the damage button, it will damage armor before health. If you press the heal button, it will heal armor before health. The project is here: https://github.com/austingaee/DamageHealth-...
3
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1answer
113 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....
1
vote
1answer
296 views

Grouping models without dictionary

I want to group an array of structs only using arrays into an array of new structs. In this example I want to group the Person structs by ...
4
votes
1answer
5k views

Countdown timer in every table cell

I am making countdown app with multiple records, so I am using UITableView to show that records and countdown dates. What I do is just take one timer and reload cells on every second. Is this a best ...
3
votes
1answer
1k views

removeAll(closure) in Swift

From this library I wrote, I have created this function in Swift, but I'm not happy with the implementation. Can anyone suggest a better way to do this? I really don't like changing counters inside <...
3
votes
2answers
129 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
votes
1answer
151 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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1answer
68 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: ...
2
votes
1answer
132 views

Faster Sieve of Eratosthenes

This is an implementation of the Sieve of Eratosthenes : It takes advantages of the fact that all primes from 5 and above can be written as 6X-1 or ...