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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NSFetchedResultsController Container

This is a wrapper for multiple NSFetchedResultsControllers. Essentially, a drop in replacement for NSFetchedResultsController to ...
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Core location background update and upload to server

I want to upload a user's location to a server to send them a location-sensitive alert, so the location needs to be fairly accurate: ...
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25 views

Random password generator for my iOS app using Objective-C [closed]

I am trying to make a random password generator for my ios app using Objective-C and I was wondering if i was doing it correctly. I want to run this in Xcode. ...
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60 views

Expandable tableView cells

What I wanted to achieve is tableView with clickable cells, anytime somebody click a certain cell, another cell with picker, UITextField etc appears below, it's like a dropdown menu. When browsing ...
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1answer
24 views

Export class instances to a string (for sharing, backup) and importing them

I have a class (Patient) with many instances.. I need a way to share the instances with other users, so I thought of converting the instance into a string and sharing it, then reconverting it into an ...
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94 views

Sesame Street project

I started a tutorial online to get a little bit more knowledge about views. But after I did the basic I decided to finish the game. The game is a little "I spy" game where the user tries to guess the ...
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1answer
34 views

UIFont expansion

I wanted to expand the UIFont class in my application so I could use the large/medium/small letters concept. I created but for some reason it looks weird. I ...
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33 views

NSURLSession load images on demand

I'm trying to come up with a system to populate my item images on demand, this is what I have so far. One obvious bug is that an item image could be downloaded multiple time since the ...
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0answers
29 views

Abstraction of NSNotification that removes the existing observer for a notification when a new observer is added

I ran into a problem in my app where under some conditions, a view controller might be loaded more than once before its deinit (where I was previously removing the observer) is ever called. So the ...
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1answer
52 views

Model for math facts

I've written a model for an app that generates math facts kids have to solve by evaluating the operation and the difficulty you pass to it at initialization. I don't like how I am repeating the code ...
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1answer
69 views

Show and hide views

I have some buttons in my class that show or hide two views (by setting their alpha property to either 0 or 1) when the user taps on them. I have written a function that uses the ...
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60 views

Showing Or Hiding AdMob Banners - Purchased vs Not-Purchased IAP Banner Non-Consumable

I have the following code that displays a standard AdMob banner depending on whether the user has purchased an ad-free (banner-free) non-consumable In-App Purchase or not (i.e. If purchased, no ...
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1answer
145 views

iOS MQTT client app base view controller

I've been working on an iOS IOT client app which uses MQTT. After some reading I decided to go with CocoaMQTT. I have only been programming in swift/iOS for about 2 weeks now, so I thought I should ...
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1answer
277 views

Creating SwiftReachability Class in Swift 2.2

I am novice at creating independent classes for user. I have seen many Reachability library for Swift, but I need to create my own class for that. Here is my code: ...
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2answers
66 views

Time manipulation for notification reminders

I'm new to programming, Stack Overflow and Code Review. I was encouraged to post this method here based on a question I posted on StackOverflow here. Let me know if you have tips for improving this ...
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1answer
82 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 ...
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1answer
47 views

Factory pattern for image or shape marker [closed]

I'm making a photo marker application and need to make a factory pattern for marker. I think it is not very flexible and overall not good. Would you check my code and suggest what could be improved? ...
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63 views

Adapting layout for various iPhone and iPad screens using constraints and multipliers

My experience with autolayout tells me that it's very difficult to make app look good on whole variety of devices (from iPhone 4s to 6s especially). Size classes are useful with device position and ...
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1answer
111 views

Tracking a geolocation

I have created this ViewController using Swift. Its job is to track geolocation and draw a line on a map and save it to core data object. I just want some advice on ...
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1answer
76 views

Stanford developing calculator iOS app assignment

I'm currently learning Swift by following the Stanford developing iOS app 2015 lecture series. I have completed assignment 1 but am wondering if there is any improvement can be made to my code. Also, ...
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4answers
63 views

iOS SDK object to represent a place

I am building an iOS SDK to be consumed by apps. I am building an object that represents a physical place. The interface looks like so: ...
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1answer
53 views

UICollectionView button target

Within my app i have a UIButton (avatar button which shows a profileVC) within a UICollectionView this button shows up in about ...
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1answer
70 views

Sorting an array of time-specific tasks of varying importance

RULES: Strict tasks must occur at the time the user selected no matter what. Flex tasks are in a priority order. Even if there is a gap big enough to fit several flex tasks with lower priority, no ...
6
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1answer
132 views

iOS delegation design pattern

I am working on a project that has a Model-View-Presenter structure and use the delegation design pattern that has the following structure/implementation. I would love feedback. The ViewController ...
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2answers
317 views

Music player in Swift

I made a simple mp3 player that plays, pauses and stops a given song, shows the time elapsed, and has a volume control. I read the documentation and can't figure out the difference between the ...
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1answer
106 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 self.tableView.tableHeaderView...
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3answers
113 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 ...
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1answer
82 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: https://github.com/LucianoPolit/...
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1answer
142 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 ...
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1answer
78 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 ...
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1answer
235 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: ...
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540 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 ...
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3answers
165 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
562 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
131 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. ...
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1answer
1k 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 <...
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1answer
680 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 ...
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1answer
147 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 ...
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76 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 ...
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398 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
54 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 brevity)...
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1answer
84 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. ...
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109 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 ...
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0answers
57 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 ...
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1answer
81 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 ...
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0answers
58 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 ...
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2answers
3k views

Background execution in iOS

The following class BackgroundExecutable is to be used to take a function f and return a function ...
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1answer
164 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 ...
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1answer
429 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
votes
1answer
108 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? ...