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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17 views

Xcode: Initializing a big static array

I have a card-based iOS app that uses a sizable static array of cards. Each card has several properties, mostly strings, numbers and boolean. The first version of this app had 3-4 properties. The ...
3
votes
2answers
52 views

Create a stack implementation that handles the multi thread scenario

MyStack.h @interface MyStack : NSObject - (id)pop; - (void)pushObject:(id)object; @end MyStack.m ...
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1answer
38 views

Controlling Drone with iOS Speech Recognition

I got a Parrot Mambo which comes with an SDK for creating your own app for controlling it. I decided to use the iOS Speech Recognition library so I could use basic voice commands to control it. The ...
1
vote
0answers
22 views

Block breaking with paddle/ball iOS Game

I created an iOS app that recreates the "ball breaking" game where a paddle is used to deflect the ball to break blocks. The main purpose is to get familiar with UI concepts since I have primarily ...
4
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1answer
91 views

Check for iOS version

Here's an approach i came up with for checking IOS versions. ...
0
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1answer
36 views

Hard-coded iOS keyboard [closed]

I am starting to write code for a keyboard in iOS. It's pretty much hard-coded and I need suggestions on how I can make it more professional style and more efficient. ...
1
vote
1answer
86 views

Using a webservice with blocks and returning data via callback

I load some data from from my webservice via a method using blocks and callbacks. From my ViewController I make a request to the data loading class and pass the ...
2
votes
1answer
62 views

Storing global constants in app delegate or singleton

I am converting a non ARC projecs to ARC. I just found that after login in my old app, the data is stored in app delegate objects, like Home_DataArray, various ...
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0answers
52 views

Priority Queue/BinaryHeap Implementation in Objective-C

I don't see a ready-made priority queue class in Objective-C. Please review this. Full xcodeproject with unit test cases at https://github.com/smartiothome/BinaryHeap Heap.h ...
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0answers
30 views

Functional-style Cocoa XML serializer and object mapper

I'm working on an XML-to-model-object serialization and deserialization library. There are three main design goals for the code: It should parse XML into and serialize from Cocoa-native collection ...
0
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2answers
68 views

Convert NSInteger into NSString

This is my sample code to convert a integer into string. Is it very costly to do the multiple loops of [NSMutableString stringWithFormat:..]? I.e should I just use appendString and get the NSString ...
3
votes
0answers
106 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 ...
2
votes
2answers
61 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 ...
1
vote
1answer
46 views

Sorting Timestamped Messages (iOS)

An app I'm building professionally includes rudimentary text messaging. It allows users to send from the phone, and it polls for new messages (I know, yikes. Push notifications are a future task) with ...
2
votes
1answer
152 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 ...
5
votes
3answers
247 views

Bubble Sort in Objective-C

Following is Objective-C method implementation I did for one of the most simplest sorting algorithms, Bubble Sort to sort an array of integers. Note:- I have defined it as a static method in the ...
2
votes
2answers
298 views

UIButton Subclass - Overriding getters to return placeholder/default values

I'm in the process of converting a custom UIButton from Objective-C to Swift which has custom properties and default values for those properties: MyButton.h ...
1
vote
0answers
48 views

Checking whether a directed graph contains a cycle

I create a myGraph class as shown below. Then I created an instance of the graph by giving the adjacency list as a NSDictionary and then call the isGraphCycleFree method. Will this answer look good ...
2
votes
2answers
70 views

Method to check if TicTacToe board has a winner

I have a class called TicTacToeBoard that has a [3][3] array of TicTacToeBoardCells. Doc neck if board has a winner, I check if ...
3
votes
2answers
52 views

Given a set of random strings, write a function that returns a set that groups all the anagrams together in objective-c

I would like to get feedback on the solution and a question regarding Big O. I am first converting each character in the string into the array and that would be O(n) then i am sorting the array O(n ...
1
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0answers
150 views

Class Level Properties in Objective-C and Swift Classes

I was recently tasked with architecting a user/profile object in Objective-C and wanted the ability to access a static instance from the class level, similar in style to the way Parse manages their ...
1
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0answers
229 views

Implementing a HashTable in Objective-C

I am trying to implement a hash table in Objective-C. I did some testing and the implementation seems to work. I am using an NSMutableArray to store linked lists ...
4
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0answers
139 views

Unit Testing Against Exceptions

I am writing a Swift library. I'm writing unit tests for that library. I am afraid that some of the code that I am testing will possibly throw exceptions. In Swift, we can handle errors, but we can ...
1
vote
0answers
32 views

Create or update a row in a queue with the given new item

This works just as documented, but the code doesn't make it very clear that it does: ...
4
votes
1answer
210 views

Finding number of times each string in an Array of strings occurs in a large stream of characters (i.e large string)

Interview problem: Given a stream of characters (e.g. acacabcatghhellomvnsdb) and a list of words (e.g. ["aca","cat","hello","world"] ) find and display count of each and every word once the stream ...
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4answers
67 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: ...
5
votes
1answer
78 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 ...
4
votes
1answer
51 views

Reporting the status of the actions of a group of SKSpriteNodes

Working on a little Sprite Kit game, I had the problem that I wanted a couple of things to wait until a group of sprite nodes had stopped their animation. I decided to use a GCD dispatch group to ...
5
votes
2answers
433 views

First Tic Tac Toe game

I've been learning Objective C for a few days so to test my skills I went ahead and made a simple Tic Tac Toe game using the console. I already have some experience with languages such as C++, Java ...
5
votes
1answer
88 views

Custom Navigation Bar View Implementation

In one of my app, i m using custom navigation bar view to handle all Navigation Bar Properties. Is it good practice to use custom navigation in given below way? Any Optimizations need to be done. It ...
3
votes
2answers
191 views

Basic ToDo App in Objective-C

This is my first app I have made after learning programming on iOS. Most of the app is complete just the UI and some features are left to be added. Any optimizations and coding practices would be ...
6
votes
1answer
203 views

Generic singleton array with archiving and insertion functions

I find that I often have to maintain a singleton primarily to hold an array that is sometimes persisted between user sessions, that should have only one class of items, and that sometimes needs to be ...
4
votes
3answers
129 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 ...
3
votes
1answer
147 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
vote
1answer
82 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 ...
6
votes
1answer
154 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 ...
6
votes
1answer
531 views

Unity3D native iOS plug-in to read pedometer data

I've made a plug-in for Unity3d for iOS. The plug-in's job is to get the Pedometer data from history within a specified period of time and return that to Unity for later use. I am confident in my C# ...
5
votes
1answer
58 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
88 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
votes
0answers
142 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 ...
3
votes
1answer
92 views

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. ...
2
votes
1answer
69 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
68 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
70 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
153 views

Synchronize access to an instance method using a 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
92 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
1k 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? ...
5
votes
1answer
378 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
412 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? ...
10
votes
1answer
395 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 ...