Questions tagged [ios]

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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1answer
183 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. ...
5
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1answer
3k 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 <...
7
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1answer
8k 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
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1answer
225 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 ...
2
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0answers
104 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 ...
3
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0answers
2k 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
votes
1answer
90 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)...
3
votes
1answer
103 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
435 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
94 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
votes
1answer
102 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
76 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 ...
8
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3answers
13k 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
343 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
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1answer
3k 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
334 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
6k 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
1k 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 ...
-1
votes
1answer
813 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
4k 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
336 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
152 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
690 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 ...
1
vote
2answers
377 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
votes
1answer
1k 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
1k 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 ...
4
votes
1answer
894 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
936 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
121 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 ...
10
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1answer
615 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
89 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
2k 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
votes
1answer
579 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 lines)...
4
votes
1answer
327 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
vote
1answer
1k 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
92 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
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1answer
128 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 ...
4
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1answer
553 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: ...
10
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2answers
3k 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
7k 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? ...
7
votes
1answer
2k views

Comparing 2 arrays of dictionaries and saving user preferences

I will start by explaining the situation and then show some code. I have an app that has an array of "default" settings to display on a user's dashboard. The user can modify these settings to enable ...
2
votes
1answer
101 views

Determining the number of days from today

Today I've got a pretty simple snippet to be reviewed. The function is extremely simple, as all it does is retrieve some entities from Core Data and then compares the ...
2
votes
1answer
289 views

Idiomatic way of handling optional values in Swift

I'm new to iOS development and also Swift. I'm working on a project consisting of a menu that leads to my various experimentations with the iOS SDK. I've written the menu titles and ...
6
votes
2answers
3k views

Registering a plist to NSUserDefaults

I've been struggling with registering a plist into NSUserDefaults and I've finally got it working, though I'm not sure that its written properly. I'm hoping someone ...
8
votes
2answers
3k views

Simple 3…2…1 countdown in iOS app

I would like to display a 3...2...1 countdown on my iOS app (before to take a picture) but I didn't find an elegant solution. I don't want to make a Countdown app with an NSTimer. For me the important ...
14
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3answers
24k views

Swift iOS - Call back functions

I'm working on an iOS app which handles API request based on authentication. Authentication is done through OAuth and every API request is sent along with ...
3
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1answer
1k views
1
vote
1answer
673 views

Push Notifications - save token id into a database using Asynchronous Request

based on this answer I modified my code. Is this the correct approach now? ...
6
votes
3answers
11k views

Save token id into a database in Swift

I want to save my users tokens id into my database using POST request in Swift (here PHP code here). I am a bit confused about synchronous and asynchronous request. Is this code the right way to do ...
2
votes
1answer
1k views

BaseTableViewController with pull to refresh and auto load more

I've implemented a table view controller for the purposes of subclassing. The table view controller implements a pull-to-refresh which will automatically reload the table view's data. I am looking ...