iOS is an operating system for mobile devices developed by Apple Inc. that is currently used in their iPhone, iPod touch, iPad, and Apple TV (2nd generation) devices. It shares a lot with Mac OS X, but is optimized for touch-based interfaces. Use this tag for questions about iOS-specific code.

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how can i refactor my http swift code to do retries? [on hold]

In my ServerAPI class I have this method: ...
3
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1answer
35 views

Using an Edit box in a table views header section to insert the values into the table using swift

Allow me to provide some context. I have a UITableViewCell that contains an EditText and a Button. This cell is then inserted into the ...
3
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1answer
59 views

Amanda's Relationship Tips app, with scroll performance issues

I am having some major issues with scrolling in my active app "Amanda's Relationship Tips" Under the User Advice tab: I'm using the Parse Database as a backend to pull user data. This lag is ...
4
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1answer
51 views

Swift menu code

I want to know what do you think about the structure of this code. If you think that there is some structural improvement to be made, tell me! Here is a github link: ...
3
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1answer
99 views

NSUser defaults cellForRowAtIndexPath

I have been going back and forth on one certain part of my code. It works, but it doesn't seem right for some reason, as I believe there must be an easier/cleaner way to implement the ...
1
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1answer
65 views

Using nested if statements to select textfield for update of associated label

So I have written a very simple program using a cocoa pods library to calculate the distance between different cities. Here is what the UI looks like: So I have a textfield on top for entry of ...
1
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1answer
42 views

Image Scrolling in UITableView with Parse

I'm trying to create an app that is scalable. One of the main features of the app is to view images from a database to a UITableView. Here is my code: ...
3
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0answers
170 views

Caching image in memory or on disk

I am caching an image locally..That same image will be used in few screens. Steps for doing this is as follows: Get image from cache If not present in NSCache, get image from Cache directory If not ...
5
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2answers
86 views

Loading Configurations from plist into singleton

In my iOS application, I've created a singleton class that reads a configuration plist file and provides accessor methods to easily retrieve the values: ...
6
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1answer
98 views

UICollectionView image gallery app

I built an app that allows users to add and remove images in a collection view. I want this to be useful online so I save the images into a database and retrieve them every time. I'm looking for ...
4
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1answer
103 views

Optimize Data Sending/Querying to Parse Swift iOS

I have a swift method that I'm using to update Parse in the backend when the button is tapped. Votes are being updated: The method acts as a voting system, incrementing a label every time it's tapped. ...
2
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1answer
204 views

Implementing the Hashable Protocol in Swift with the DJB hash function

A while back I made a custom String struct (see github repo) because of the difficulties in dealing with Mongolian Unicode rendering when using Swift String or ...
5
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1answer
119 views

Star Rating in Swift

So I needed a a star rating feature to appear in my app - it doesn't need to be interactive. I have my app connected to a database I've set up in Parse, and I've made a column for OurRatingof type ...
6
votes
1answer
128 views

Ensuring non-expired token before every request

I'm developing an iOS application where data is fetched from a third-party REST API. Each request must contain an authorization token. In order to implement this, I've written a ...
1
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0answers
59 views

Parsing JSON with generics

I get back two dictionaries, I need to parse through them and put in an array two objects. I think I did a very poor job and I have a feeling there is a better way to make the code more compact and ...
1
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0answers
110 views

Custom view for data input (in-app (non-system) keyboard)

I have made a custom keyboard that gets loaded from an .xib file. I decided to go with an in-app only keyboard rather than a system-wide keyboard because the documentation states: Make sure a ...
5
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1answer
42 views

Simple plotting abstract base class and example subclass

I came across a CocoaControl ZFPlot and wanted to extend here. I ended up writing a base class (ZFPlot shown below) as well as several extensions (ZFLine, ZFScatter, ZFBar, none shown here for ...
3
votes
1answer
64 views

Downloading and parsing data

I developed this class to download a JSON from a server, parse the result and call a delegate back on the class that called it. Since I am self started I want to know if this is a good practise. ...
3
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0answers
79 views

Algorithm for downloading images

I am working on a product application where user could sell/buy. This application is based on collection view. Collection view has collection cell where it displays product image thumbnail. The ...
2
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0answers
40 views

Quartz2D, circular slider performance optimization

I have a circular slider. Each time i move finger i call [self setNeedDisplay], get new angle to change handle position and mask arc. When i move very fast my CPU load about 70%, it's very hight as ...
5
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1answer
70 views

Optimise Code for KukuKube Game

I developed a Kuku Kube game for iOS. Each time I choose a correct different color tile, it will increase a number of tile quantity 2x2 3x3...10x10. How to optimise the code each time the tile ...
5
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0answers
54 views

Moves box in direction of touch, and has wraparound when reaching edge of screen

Part of me thinks that it would be simpler to ditch Apple's move API and just updated position with a timer. I know that's what I did with a JS canvas snake game I built a while ago. But I'm also ...
7
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2answers
1k views

Background execution in iOS

The following class BackgroundExecutable is to be used to take a function f and return a function ...
1
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1answer
127 views

Retrieving creation date from Parse.com data

I got to show the createdAt date in a message timeline, I tried to make a separate array only for dates, but don't know if it is the right path to follow. It seems ...
3
votes
1answer
178 views

Set a font for a UITextView if the font is nil or not equal to desired font

Main question I am setting a font for a UITextView that is a subview in a custom view. I only set it if the user didn't specify the font size in the Interface Builder. I have the following working ...
3
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1answer
82 views

Switch statement for adding/removing operands to the text part of a label

I have a switch statement with five cases, and four of them are really similar to the others. How could I properly refactor this code to eliminate the duplication of code? ...
4
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2answers
760 views

Removing a subview with a subview from a UIView without memory leaks

I made a custom UITextView for vertical Mongolian writing. It is made by subclassing UIView, which has a subview called ...
5
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1answer
132 views

Repeatedly check URL for change on iOS

I am wanting to constantly check a URL http://www.example.co.uk/untitled.php which will either return 1 or ...
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1answer
136 views

Reading QR Code

What I need to accomplish is matching the QR code to the one I have created. This code works, except it takes at least 30 seconds to verify that it has matched my QR Code. How can I make it faster? ...
4
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2answers
512 views

Recursive function to show directions for multiple locations

I have a Mapview which shows a bunch of locations (Events). Here's the code of an Event object. ...
4
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1answer
185 views

Using Grand Central Dispatch to fetch data from Parse.com and update UI asynchronously

This works, and the UI is snappy in the simulator, but since this is my first time really using GCD, I'd just like this code to be reviewed before I start using it everywhere. Note that this is ...
3
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1answer
69 views

Constraints for auto layout

I am adding some constraints for my auto layout. My method calling the methods creating the constraints: ...
2
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0answers
159 views

Interactive transition between view controllers

I have made an interactive transition controller in Swift in two different ways. This interactive transition controller is the parent class and I have few child classes which adapt the parent for ...
0
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2answers
107 views

Image-uploading

This currently works properly, but just takes too long. Some of the functions in it are necessary and need to remain, such as resizing, and double saves. But it probably has room for improvement. I ...
10
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1answer
124 views

Blurring an Image

Lately, I've been part of a team working on a utility library for iOS called Thundercats (on Github). We're about to start working on some changes and upgrades in preparation for a 2.0 release, so we ...
8
votes
2answers
258 views

iOS Utility methods for UIView

Lately, I've been part of a team working on a utility library for iOS called Thundercats (on Github). We're about to start working on some changes and upgrades in preparation for a 2.0 release, so we ...
3
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1answer
124 views

Second attempt at Hangman in Swift

I recently posted my Hangman game, and got some amazing feedback! The main thing suggested was to create a word generator that could read JSON files so that my hangman brain class didn't have to ...
7
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1answer
112 views

Hangman in Swift

I am a Java programmer trying to learn the ways of Swift. I coded a Hangman game in Xcode. I was wondering what I could improve, specifically whether I used delegation correctly and if there is ...
3
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0answers
67 views

Second attempt at Sierpinski Triangle App

I am a Java programmer trying to learn the ways of Swift. A few days ago, I posted the code for a very simple app that draws a Sierpinski triangle and implements a pretty buggy zoom. I was told to ...
9
votes
1answer
313 views

Parse query checks and increments

In my app, the user can upvote a cycling track if they want to ride on it. Note: I do understand I can use a boolean column to check if a user has voted or not, but, I am just testing at the ...
7
votes
1answer
60 views

Draw editable angles

One of the first things I did when I learned Objective-C was to create a little canvas with editable angles. Basically, you tap to create points. Every tap connects to the previous tap. So if you tap ...
6
votes
1answer
282 views

Multiple Choice Guessing Game

I've built an app for members of an organization I'm in--the app shows the picture of a member with four multiple choice buttons, and the user then tries to guess the member's name. Pretty simple, ...
10
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1answer
116 views

Finger painting code

I have a very simple view that handles touch events and draws accordingly. It's nothing significant, but it does use a bit more CPU than I would like (35%). Again, it is the bare minimum (<90 ...
4
votes
1answer
86 views

Imitate UITableView reordering interaction

I have a UIScrollView full of vertically stacked subviews which I want the user to rearrange as they desire. I've implemented a ...
-1
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1answer
87 views

Globally accessible helper class [closed]

I would like to get opinion if I am doing this right. I am creating a helper class that is globally accessible to my whole project. I want it to be easily called like ...
3
votes
1answer
53 views

Managing a wish list from an API

I have a class that I use to manage a list to/from an API in Swift. Using a clean code approach, I'm wondering if, how, and why I should change it when I have a class that uses it for just one or two ...
11
votes
1answer
99 views

Top wiki pages as an app

I recently did an interview task. I was rejected because of bad code quality. There was two tasks. Here I will present the first, second will be posted in time. This project is avalible on GitHub ...
3
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1answer
209 views

Show a quiz from JSON in iOS

I have to create a quiz of showing questions from a JSON and post back the answers. Here's the structure of JSON: ...
8
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1answer
1k views

First assignment for Stanford iOS8 Course: enhancing a calculator

I recently started learning Swift through Stanford iOS8 Course. The first assignment is to add some features to simple Calculator which was presented during lectures. List of tasks: add button for ...
6
votes
1answer
334 views

Checking two text field for match and checking for null

Is this the most efficient way to do this? Any suggestions on some thing I might have missed or can do better? ...