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.
3
votes
1answer
18 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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-3
votes
0answers
11 views
zlib.h and zconf.h Byte not defined [closed]
I am compiling a code that uses zlib compression library, however I get an error:
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3
votes
0answers
21 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 ...
-1
votes
0answers
10 views
How to make a Setter method which would normally take a mutable variable, to a setter which will take a non-mutable version [closed]
I’m working in Objective-C, SpriteKit and am trying to create a class which will work in both OS X and iOS for flexibility.
My ...
1
vote
1answer
27 views
Several questions about my new solution to creating a class which has a method running every frame
I’m working in Objective-C, SKSpriteKit and am trying to create a class which will work in both OS X and iOS for flexibility.
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2
votes
1answer
30 views
Have I created the <mutableDeepCopying> protocol properly?
I’m working in Objective-C, SKSpriteKit and am trying to create a class which will work in both OS X and iOS for flexibility.
I have just created a new protocol for my programs: ...
2
votes
0answers
29 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 ...
2
votes
2answers
42 views
Method for finding all classes
This was inspired by a Stack Overflow question about getting all the classes of an application and I took it a little too seriously (or perhaps not seriously enough).
It's rather silly to do it this ...
1
vote
0answers
96 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
63 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 ...
0
votes
4answers
248 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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1
vote
0answers
51 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
72 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
78 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
votes
1answer
89 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
178 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
102 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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-1
votes
2answers
195 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
52 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
64 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
95 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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2
votes
2answers
92 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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2
votes
1answer
82 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
145 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
66 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
votes
1answer
71 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
245 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
192 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 ...
1
vote
1answer
156 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
251 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 ...
0
votes
0answers
160 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
163 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
440 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
256 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
182 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
704 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
138 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
620 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
70 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
119 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
125 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
126 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
400 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
61 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
577 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
1k 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
123 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
99 views
Store CMTimeRange into Core Data
I wanted to store CMTimeRange structures inside managed objects, so I've worked out the following:
...
3
votes
1answer
140 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
236 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. ...
