A late-binding, message-based, object-oriented language that is a strict superset of C and is primarily used for programming on Apple's Mac OS X and iOS platforms. Objective-C can also be used on other platforms that support gcc or clang.
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82 views
Synchronize access to instance method using static serial queue
In my current project I have a number of data services classes, each one dedicated to a specific source of data so that it's responsible of downloading data from its api, checking for local database ...
5
votes
1answer
48 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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4answers
186 views
My own method for sorting numbers in array
I've written some method for sorting asc and desc numbers in array. All I want to know is this good logic, and is there a space for improving this code?
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0answers
46 views
Creating CSV to email [closed]
While this isn't a problem, I wanted to hear if someone could please check the format string I use when I create an CSV file? It does work, but it looks kind of "weird" and was wondering if this was ...
5
votes
1answer
55 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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votes
1answer
61 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?
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10
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1answer
70 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 ...
7
votes
1answer
126 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
votes
2answers
89 views
Find all multiples of a number in given range in reverse order
I have a problem set which requires me to print all the multiples of a number in given range in reverse order.
So far I have tried this but not sure it is optimized or not!
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2answers
141 views
Quicksort for Objective-C
This is quite plain vanilla, but I'm hoping for Objective-C specific feedback. Also I'd be interested in what folks think about sorting in Objective-C vs. doing all sorting in C or C++ (and which?) ...
7
votes
1answer
44 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 ...
4
votes
1answer
54 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 ...
11
votes
1answer
88 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
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votes
2answers
85 views
Getting hours during the day
I have this method that returns an array of all the hours for the past 24 hours, ex: if the current time is 3:24pm it looks like @[3pm,4pm...12am,1am...2pm,3pm];
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1answer
72 views
Intercept URL containing values or not
I need to intercept a URL and go outside the WebView if the URL contains MAPS or DOCUMENTS ...
5
votes
1answer
108 views
Fetching Background Data in iOS View Controller
I am trying to come up with a way to fetch the same data both when the application is running and when it is in the background. The code I have written so far works... I just think it is very messy ...
3
votes
2answers
63 views
Comparing IDs in two arrays
I have two arrays that I need to compare if their IDs are equal. This is how I am currently doing it:
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7
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1answer
69 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 ...
7
votes
2answers
215 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 ...
5
votes
2answers
175 views
Consecutive Primes challenge at CodeEval.com and memory allocation issue
I finally solved this challenge with using recursion and figured out why the automatic scorer wasn't passing my previous solutions. I was using NSMutableArray to ...
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vote
1answer
148 views
Consecutive Primes challenge at CodeEval.com
I am working through a new challenge on CodeEval.com and I think I am getting a correct result but I can't get through their grader. I am not exactly sure where error is. I didn't post this on stack ...
2
votes
1answer
218 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 ...
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votes
0answers
141 views
Unit testing - Parsing data from the Weather Underground API
I'm writing unit tests for the first time.
The tests are for my library on Github.
I downloaded the JSON and stored it into a local file that looks like this:
...
6
votes
1answer
143 views
Find the next 7 o'clock NSDate
In my very specific scenario, I need to get an NSDate holding the next time the hour will be 7 (either AM or PM).
On the case that this is the first time to do ...
2
votes
2answers
346 views
Creating an iOS form with many similar text field cells
I'm using multiple instances of an object creating a form:
...
3
votes
1answer
198 views
Retrieving values from UITableViewCell
I have a UITableview with custom cells, every cell has a button called cellButton. When the user taps the button I present an ...
7
votes
1answer
172 views
Localization manager based on ReactiveCocoa
I have a localization manager class which can change app language on the fly. It's using ReactiveCocoa and my main concern is that I'm not using some of RAC parts correctly.
First (in ...
12
votes
4answers
680 views
Generating an ordinal number for the day of the month
I am relatively new to programming and came across an if statement that I believe to be a bit verbose. I have tested my code and it appears to work without any ...
5
votes
1answer
129 views
Creating and saving blurred screenshots in iOS
I am trying to create a class that takes a screenshot of the screen, makes it blurry and saves it to NSUserDefaults.
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5
votes
1answer
485 views
Caching data on disk in iOS
I've got an app that's got an activity/timeline like view. Since I don't want to retrieve the entire timeline every time, I'm caching all the events.
Currently, this is how I go about it:
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3
votes
1answer
67 views
URL-finder using a lot of memory
I'm trying to get the URL of the browser with Mac OS X app. I wrote some AppleScript and am trying to use it in Cocoa. The problem is, when I watch it with instruments, memory is increasing, and at ...
9
votes
1answer
116 views
BiDirectional Dictionary (and its Mutable friend can come too)
I've attempted to implement a 1-to-1 dictionary in Objective-C. I'm probably missing some convenient methods that one might commonly want to use.
These are both declared in the same ...
4
votes
1answer
116 views
Truncate 160-bit output from SHA-1 to 64-bit uint64_t
I'd like to truncate 160-bit output from SHA-1 to receive a (weaker) 64-bit digest.
It has been a while since I did the type of low-level C pointer arithmetic in the but-last line. Could you please ...
8
votes
1answer
124 views
Brute Force (and not) Bejeweled AI
My approach to solving the problem of selecting the best match on a bejeweled board is a fully object oriented approach. Some of the other relevant code can be found in my previous questions ...
3
votes
1answer
322 views
Animated Score Amounts for Game
This is a simple class for a label with a score that animates counting up or down. When someone in the game scores points, the numbers count up or down to the new total.
Here is an example of what ...
5
votes
1answer
60 views
Unit Testing Bejeweled Wilds
I created a pretty complex algorithm for calculating matches on a Bejeweled board that kept track of matches involving wilds. After doing some in-game testing, I found quite a few bugs that needed to ...
10
votes
1answer
462 views
Changing image of a UIImageView based on a scrollView contentOffset
My task is pretty simple and my code works, it's just that my code feels a bit clumsy to me (and probably will for you too).
I have a view controller (...
3
votes
1answer
837 views
Using NSPredicate with NSFetchRequest in a NSFetchedResultsController
I am learning CoreData and I wanted to have my code reviewed. As usual, I get something to work, then I attempt to refine it.
I have a data model that consists of an Item entity and a subItem entity. ...
11
votes
1answer
119 views
Bedazzling My Bejeweled Animations
I've spent a few days working on the animations for my Bejeweled clone and I am pretty happy with the results so I am posting the code for review. This is the most advanced animation code that I have ...
5
votes
1answer
90 views
Store CMTimeRange into Core Data
I wanted to store CMTimeRange structures inside managed objects, so I've worked out the following:
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1answer
117 views
HMSegmentedControl react to tapping on currently selected segment
I'm using HMSegmentedControl, an open-source UISegmentedControl subclass. I'm trying to react to the user tapping on the currently selected segment. HMSegmentedControl only supports reacting to a ...
4
votes
1answer
194 views
Switching between view controllers that are loaded in the background
I have a dining menu app that scrapes the data from a website and redisplays it in a mobile format, displayed below:
If the user swipes left and right, the app will show the previous/next meal (ex. ...
10
votes
2answers
164 views
Refilling a Bejeweled Board
When you start thinking about designing a Match 3 type game, you realize that there are a great many ways to structure the rules. In this particular variant, the direction that the player swipes the ...
13
votes
2answers
432 views
LinkedList (doubly) implementation
CKLinkedList is the implementation of a doubly linked list. I'd like to see comments on the memory management (I'm using ARC in the code below) and formatting + ...
12
votes
1answer
135 views
Board Evaluator for Bejeweled Clone
I've been prototyping a Match 3 game (Bejeweled clone) because I have an interesting concept for one, and because it is good practice. One key aspect of my version is that the matches must contain ...
4
votes
2answers
76 views
Saving Separate User Profiles
I am modularizing some of my code in order to make it reusable in future projects. The latest thing that I have created is a simple class that saves user profiles. The list of profiles is loaded ...
6
votes
2answers
1k views
Segue between view controllers using NIB files
I'm learning how to develop for iOS and I want to begin with nib's before storyboard to get a better understanding.
I just set up 3 view controllers:
...
8
votes
1answer
119 views
“The Ministry Of Truth” challenge at CodeEval.com
I am working on another challenge from CodeEval.com and this is a bit harder. I would like to get some feedback on my logic of solving the challenge. Also there is probably one edge case that I ...
5
votes
1answer
96 views
Reverse Groups challenge at CodeEval.com
I am working through challenges at CodeEval.com and wanted to get your input on my code for this challenge.
Given a list of numbers and a positive integer k, reverse the elements of the list, k ...
1
vote
2answers
86 views
Archiving data in file system for iOS
Being my first time archiving data to the file system, I would like to have my code reviewed. This simple test project works as expected, but I want to see if what I am doing is following best ...
