Objective-c is a highly dynamic message-based object-oriented language, superset of C, that is a primarily used for programming Apple's Mac OS X and iOS platforms.

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Objective-C Lesson in Class Design

I have the following classes: Teacher Student Class (like a school class) They all extend from KObject that has the following code: - initWithKey - send - processKey Teacher, Student ...
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221 views

Custom animation iOS

I have seen animation, and i can't figure out how to do something like in this video(youtube). I want to discuss how it's made. I don't think that they're using sprites. I have one idea how to do ...
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2answers
818 views

Basic Objective-C Questions

I'm new to objective C, I'm following "Objective C 5th Edition Stephen Kochan and I don't have anyone to ask my doubts to. I'm confused with this question: Q. Is it necessary to use "-" or "+" before ...
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1answer
325 views

Design pattern for locking asynchronous operations in Objective-C

I'm writing my first Objective-C Class. It's responsible for interaction with an HTTP SSO authentication service. The process requires multiple HTTP transactions in order to complete. The Class acts ...
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1answer
666 views

When to use embedded script language?

I already read some post about the why use embedded script language but I want to ask when to use it. I have implemented an Objective-C / Javascript binding framework which allow me to write ...
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5answers
2k views

What are the reasons to create UIView subclass?

I've noticed that there are a lot of UIView subclasses in my legacy project. Mostly the only reason of such a subclass is to split bigger view into custom subviews and provide layout for its subviews ...
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3answers
315 views

Where should I put methods that make an Http Request to get data from a web service in iOS development?

I have a Model Car in my iOS application where it's parameters like name, year, value etc are fetched from a web service in order to fill a list with cars data. Where should I put the method that ...
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3answers
362 views

In Objective C, what English words can I conceptually associate to the symbols?

I'm learning Objective C (from a C# background) and am having difficulty understanding the unusual method signatures and am looking for a shortcut to make the learning curve less steep. When reading ...
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2answers
472 views

Is state pattern a good solution for implementing UI changes for Landscape and Portrait modes?

For our iOS app, a lot of complicated UI logic depends on the interface orientation of the ViewController. This conditional logic is present in a lot of places. Can it be segregated into different ...
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1answer
444 views

Apple Dispatch Queue vs Threads

I've heard a lot about apple's famous dispatch queues and the GCD but today was the first time I decided to understand exactly what is going on, so I started reading Concurrency Programming Guide and ...
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4answers
342 views

What can I do without the iPhone SDK and Xcode? [closed]

I want to develop an iPhone application, I do not have Xcode nor the iPhone SDK (nor a macbook but I plan to buy one). What could be done without those products? Edit: I intend to release it on ...
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4answers
489 views

What is the proper way to store an object with many attributes in Objective-C?

I have an object that I am downloading over HTTP, that has approximately 50 attributes. What is the proper way to store this information in Objective-C? Should I have an NSObject with a property for ...
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3answers
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Is it considered a bad practice to add logic in a property setter?

I jumped in to a project and I see that the other developers are adding a lot of logic in the setters of synthesized properties. I understand how this works, but I think that it makes it hard to ...
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3answers
1k views

Why use protocol, not call the method directly?

I was asked this question in an interview. For eg: UITableviewDelegate protocol has CellForRowAtIndexpath. Why make it a delegate method in a protocol not a method in the UITableView class and call it ...
0
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1answer
521 views

Which is faster NSDictionaries or object properties?

If I abandon creating model objects which I only use to pass information and use NSDictionaries instead and have constant for keys in the same place where I am using the model, then does it have any ...
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2answers
533 views

Why do we use networking libraries instead of plain NSURLRequests and NSURLConnection ?

in iOS development, I have often seen people creating a networking module to interact with their APIs. This module generally sits on top of a networking framework like MKNetWorkKit or AFNetWorking. ...
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1answer
157 views

Truth condition testing with BOOL

BOOL myBool; myBool = YES; ... if (myBool) { doFoo(); } I have read that because there are instances where the above does not actually call the doFoo() function, it is best to instead always test ...
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1answer
257 views

PayPal proof of payment - is there a need to store it at our server?

I am developing an iPhone app, which I am integrating with PayPal. I did it successfully using PayPal library. I am testing it on sandbox mode. When I transfer money from one account to the other ...
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1answer
238 views

NSException in init when having a custom designated initialiser?

I have a custom View Controller that is a subclass of UIViewController that requires a data object to be set up properly. Without this object, showing the VC doesn't make any sense. So I created a ...
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1answer
939 views

Getting rid of Massive View Controller in iOS?

I had a discussion with my colleague about the following problem. We have an application where we need filtering functionality. On any main screen within the upper navigation bar, there is a button ...
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2answers
2k views

Programming against a protocol in Objective-C

I stumbled accross the SOLID principles. There is one burning question. Should I always use protocols? I never saw someone using them in the way that a Java developer would use them. I tried it in a ...
2
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4answers
553 views

Is Objective C a reasonable way to learn C? [closed]

I want to learn C but I tend to learn best when I have a project to work on. I've never done iPhone development, so I'm hoping to kill two birds with one stone. Will learning objective c also teach me ...
2
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1answer
2k views

Why is it impossible for Google to port V8 along with Chrome's codebase in C/Obj-C on iOS?

Google has given a reason that All apps on iOS have to run in the sandbox environment except for special apps by apple that get to tap into some private APIs. So Chrome on iOS uses whatever the ...
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1answer
262 views

Objective C - nested messages … confusion about

Wonder if anyone could shed some light on this messaging construct: The documentation says that messages appear btwn brackets [] and that the msg target/object is on the left, whilst the msg itself ...
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2answers
256 views

Is it a good idea to put declaration of protocols for delegates in a private category interface?

I have a View Controller or a View that implements delegate and dataSource methods of UITableView. These methods are not going to be used outside this class. So is it a good idea to make the ...
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1answer
1k views

How to implement a Theme for View Controllers in an iOS app?

I have an application, where font size, font type, color, background color, image and a lot of things change based on theme. I realised in the beginning itself that using enums to denote themes and ...
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1answer
110 views

Using third party/ open source controls [closed]

I usually feel reluctant to use any third party or open source controls while coding in Objective-C iPhone due to following reasons. Open source controls are developed in incremental manner. So once ...
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2answers
446 views

What is the most appropriate testing method in this scenario?

I'm writing some Objective-C apps (for OS X/iOS) and I'm currently implementing a service to be shared across them. The service is intended to be fairly self-contained. For the current functionality ...
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3answers
692 views

Why did Apple choose to design its programming language with future and past tense method names?

There are a lot of methods like this in iOS/Objective C: - viewDidLoad - viewWillAppear: - applicationDidFinishLaunching I've just been having a discussion with some colleagues about this design ...
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1answer
155 views

How to embed an article in the source code?

Sometimes, I notice typos in articles (blog posts) or books in source code that appears in the body of the article. It may be an indication that the code has been manually copied and pasted (e.g. ...
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1answer
2k views

Objective-C class cluster pattern

I have many sublcasses of one class. I choose concrete class based on type (simple enum). I like idea of class cluster. Should i use it or just create factory class (but each class in objective-c is ...
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1answer
418 views

Implement a file system for ios devices

I've read that ios apps can communicate via unique urls. An online tutorial on tutsplus says Communication between apps provides your application with an opportunity to take advantage of other ...
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3answers
2k views

What is a static method compared to instance/class/private/public methods?

I'm learning programming in Objective-C and I can't understand what a static method is. I know what class/instance/private/public methods are. Can someone explain what it is using an example and ...
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1answer
74 views

Program Structure for Table Cells Representing Objects

So I have a program with "cue" objects and each have their own table cell. The thing is that the table cells have loading bars on them that represent the progress of the cues. This presents the ...
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1answer
350 views

Is object-oriented conceptual thinking something you build with experience? [closed]

I know that the answer is pretty clear because you get better on everything with time and experience. But I'll tell you where I'm coming from: A couple of months ago I decided to learn iOS ...
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4answers
256 views

Should I read a chapter about Memory management if now a days we mostly use ARC?

I'm reading a book on Objective C, and I was wondering about 2 things: Should I take the time currently to read a whole chapter on memory management? If you are doing a really good job on manual ...
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2answers
299 views

Why is “working with files” is an important subject when learning Objective C?

I'm reading a book on Objective C, and I was wondering how important the subject Working with files for learning to develop iOS in particular? On you tube the tutorials are very short, maybe 10 min ...
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3answers
930 views

C++ vs Objective-C design principles of setters and getters

In C++ I was told that my classes shouldn't have getters and setters: Doing it wrong... blog post. On the other hand, in Objective-C, the direct use of ivar is discouraged, because the getters allow ...
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1answer
752 views

Can Objective C categories serve the same purpose as Traits do in Scala?

The statement of the question seems little abstract to me, so please read the details below. Since the time when C++ was the first choice Object Oriented Language for almost anything, we had a big ...
16
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4answers
8k views

success:/failure: blocks vs completion: block

I see two common patterns for blocks in Objective-C. One is a pair of success:/failure: blocks, the other is a single completion: block. For example, lets say I have a task that will return an object ...
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2answers
1k views

Core data syncing (deletion) using a custom REST web service

I need to sync my local core data stack against a server running a persistent data storage underneath the covers. (I've gone through other posts here and on SO on similar topics) My requirements: ...
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1answer
1k views

Preventing override of methods in Objective-C [closed]

Objective-C lacks private methods or java-esque final methods. This means that it is possible for a subclass to (accidentally) override some of the internals of a superclass. How does one prevent ...
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1answer
286 views

How to avoid huge functions with made up of enums and if-else or switch case when dealing with server response in iOS?

in my application, I have a request type associated with variety of API calls I make to the REST server. when the response from server comes in the same delegate method for web engine's response, I ...
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1answer
1k views

Pictures from iPhone to clients FTP server - Directly (iPhone->FTP) or Cloud (iPhone->Amazon->FTP)

My clients wants to take pictures with their iPhone's and place them collectible on their server, suggested by FTP. I can see there is two solutions: Directly upload from the iPhone to the FTP ...
4
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2answers
1k views

What patterns book for iOS development contains this specific information? [closed]

I've read several books on iOS development and Objective-C, however what a lot of them teach is how to work with interfaces and all contain the model inside the view controller, i.e. a ...
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3answers
863 views

When should one use “out” parameters?

In Objective-C, there are several methods like initWithContentsOfFile:encoding:error: where one passes in a reference to an NSError object for the error: parameter. In this example, the value of the ...
2
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4answers
737 views

Strategy for avoiding duplicate object ids for data shared across devices using iCloud

I have a data intensive iOS app that is not using CoreData nor does it support iCloud synching (yet). All of my objects are created with unique keys. I use a simple long long initialized with the ...
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6answers
4k views

Why was Objective-C popularity so sudden on TIOBE index? [closed]

I'd like to ask a question that is pretty similar to the one being asked here, but for Objective-C. According to TIOBE rankings, the rise of popularity of Objective-C is unprecedented. This is ...
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1answer
296 views

What is the convention for the star location in reference variables?

I have been learning Objective-C, noting that different books and examples use differing conventions for the location of the star (*) when naming reference variables: MyType* x; MyType *y; MyType*z; ...
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2answers
568 views

Objective C style nil in java?

Objective C has a concept of a nil object which would accept any method call with any parameters without complaining and silently return another nil. I have used something similar in Java using ...