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.

learn more… | top users | synonyms

0
votes
0answers
14 views

Dynamic forms in iOS

I'm not quite sure if I'm in the right community...I'm new to iOS development and come from .NET I want to write a app which receive a xml over http and creates a dynamic form from this xml. In the ...
66
votes
4answers
15k views

How can Swift be so much faster than Objective-C in these comparisons?

Apple launched its new programming language Swift at WWDC14. In the presentation, they made some performance comparisons between Objective-C and Python. The following is a picture of one of their ...
3
votes
2answers
337 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 ...
-4
votes
1answer
46 views

What do I need to make a messaging app? [closed]

I was wondering how to make a messaging app like whats app? What are the resources I need? What will I need yo know? I want to make it for iPhone's. I know some obj-c but that's really it...
0
votes
1answer
81 views

Delegate method privately called from delegate itself?

One has established design patterns so ingrained in their brain, that when sometimes somebody does something unexpected, it is a revelation. My colleague in an iOS project did call the delegate ...
0
votes
1answer
113 views

How does Telnet work?

Is telnet just a simple socket connection? I usually have a difficult time in the networking area so I use some code from the internet to help me out, but I can't seem to find a library for Telnet in ...
1
vote
1answer
116 views

Should I implement a function or a method?

Once in a while I encounter a C function in my colleagues' code. Mostly it is in some helpful objective categories, and those functions are mostly an internal calculation of something or a ...
10
votes
4answers
3k 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 ...
2
votes
1answer
125 views

Calling static method from instance of class

As a developer I am fan of static methods. Recently I come across difference between OOP languages about this static methods. All OOP language use static method to access any method without ...
0
votes
1answer
60 views

Drawbacks to redefining method in precompiled header

I have a lot of calls to NSLog(...). I need to change all of these calls to CLSNSLog(...). So I added this to my precompiled header (.pch): #import <CrashlyticsFramework/Crashlytics.h> #define ...
0
votes
0answers
53 views

Manage the persistence of entities on iOS in several places: CoreData on the device, iCloud and on a REST API

For the needs of a project, I would persist the datas contained in Core Data in several places depending on the state of the user. If the user is logged to my API -> Persist the datas on my API. ...
1
vote
0answers
98 views

What are the bad points of using Core Data for iOS like an ORM

I just starting to use Core Data for my iOS app and I am thinking about how use Core Data for my needs. What are the features of my app: The user look for products proposed from a catalog. The user ...
1
vote
2answers
135 views

Objective-C style: Do I implement factory methods or init methods?

I'm new to Objective-C programming, and creating various classes for an iOS application I'm working on. When creating objects, it seems like many classes in the built-in frameworks use the "static ...
2
votes
1answer
549 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 ...
1
vote
2answers
153 views

How can NSObject contain an NSString if NSString is an NSObject

How can NSObject contain an NSString if NSString is an NSObject /* NSObject.h Copyright (c) 1994-2012, Apple Inc. All rights reserved. */ (NSString *)description; NSObject has a property named ...
-2
votes
1answer
1k views

in Objective-C, value of type double/float can only be NAN, INFINITY, & normal number?

I knew double or float value can be not only normal value(-1.3, 0, 1.0, 2.3) but also NAN and INFINITY in Objective-C. Is there other special values except for NAN and INFINITY for double/float value ...
1
vote
1answer
174 views

Create an Objective-C category to route methods depending on a specified type

For one project, I needed to find a solution to avoid code like this: if ([self.desiredColor isEqualToString:@"Red"]) [self constructRedMenu]; else if ([self.desiredColor ...
0
votes
0answers
60 views

Difference between class clusters and abstract factory in cocoa

I have read that Obj-C class clusters are an implementation of the abstract factory. Can anyone explain if there are any differences between the 2 as design patterns. I read somewhere that there are ...
1
vote
1answer
89 views

Is it bad practice to include two types of views in the same class?

In my app, I use a widget with a loading spinner to signify that a network request is waiting. On failure, there will be another view which contains a failure message and a "Reload" button. My ...
1
vote
4answers
176 views

Difference between the two enums

I came across an enum definition :- typedef enum NSInteger { kBorderTypeNone = 0, kBorderTypeLeft = 1 << 0, kBorderTypeRight = 1 << 1, kBorderTypeTop = 1 << ...
0
votes
1answer
171 views

In objective C, where does the inheritance chain end? [closed]

In objective C, classes are objects, but what object owns the class objects? I am trying to get as detailed an understanding of iOS programming as I can, and this question popped into my head, so I ...
0
votes
0answers
48 views

Use Objective-C protocols like Java interfaces [duplicate]

I'm a Java developer moving to Objective-C. So far in Objective-C I've seen protocols used extensively to implement the delegate pattern, but I haven't seen then to add a layer of abstraction in the ...
20
votes
2answers
6k views

Why is Objective-C not widely used beyond Cocoa environments?

Objective-C features nice object orientation, simplicity, elegance, and (as a superset of C), low level ability. It could seem like the simple, modern alternative to C++ that many people look for and ...
0
votes
1answer
90 views

Significance of many-to-many relationships? [closed]

How important are to-many relationships in iOS programming? Do you often hold a list of pointers to objects in an array in your codes? I don't think I fully understand the concept of to-many ...
4
votes
1answer
702 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 ...
0
votes
2answers
159 views

How to remove redundant code that enables button. Or “if” statement

I got probably "micro optimization" problem. I got "History number", "Next Number", "Reset" buttons, as well "label" for text. Every time I click At "Next number" button I would like to show random ...
3
votes
1answer
103 views

Testing: Should I wrap system notifications and send my own?

In the current Cocoa app I'm working on, I've got an object, RecordScheduler, which responds to two types of notifications, "day did pass" and "quicksaving interval did pass". In both cases, the ...
3
votes
6answers
4k views

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

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 ...
0
votes
1answer
133 views

detect if a combination of string objects from an array matches against any commands

Please be patient and read my current scenario. My question is below. My application takes in speech input and is successfully able to group words that match together to form either one word or a ...
0
votes
0answers
64 views

How do I get fluid gesture motion in third party maps app on iOS?

There are a couple of apps on the App Store that use external map sources, for various reasons, to display map data. Some even have multiple sources for bike traffic and so on. However some of them ...
0
votes
2answers
145 views

Is it acceptable to use C11 generic macros in Objective-C to box numbers?

I was getting tired of repeating types when writing things like this: NSDictionary* d = @{@"so": [NSNumber numberWithInt:index]), @"much": [NSNumber numberWithBool:accepted]), ...
-6
votes
3answers
615 views

Are Extension methods (C#) and categories (Objective-C) the same as traits? [closed]

According to: Something similar to Objective-C categories in other languages? Static extension methods in C# are basically the same thing as Objective-C categories, so I'm going to lump these two ...
2
votes
2answers
3k views

Is this a proper implementation of an iOS MVC pattern?

After browsing the apple docs, I came across this sample of their MVC pattern: Using NSNotificationCenter and without using KVO, would this diagram below represent a correct implementation of the ...
-2
votes
3answers
131 views

Is explicit else needed in initialisers? [duplicate]

I have a custom designated initialiser like this: - (id)initWithLocation:(CLLocation *)location { if (location == nil) { return nil; } self = [super init]; if (self) ...
5
votes
1answer
592 views

New to iPhone Development - iOS5 Storyboard

I'm new here and pretty new to iOS development. My question is basically, should I learn the old school development methods or just learn how to do things using the latest tools (i.e. Storyboard)? ...
5
votes
1answer
240 views

Can anyone explain to me what problem Core Data solves? [closed]

Core Data seems to add a needless layer of complexity. If you want to save data created natively by the user in an app why not just use an object and then write the data all to SQLite or back to a ...
0
votes
2answers
666 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 ...
1
vote
0answers
109 views

Designing object oriented programming

Basically, I want to make api calls using an SDK I am writing. I have the following classes: Car CarData (stores input values needed to create a car like model, make, etc) Basically to create a ...
1
vote
0answers
91 views

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 ...
1
vote
1answer
170 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 ...
11
votes
4answers
7k views

Where does Objective-C fall in the language performance continuum?

There seems to be a lot of discussion of the various speed merits to C or C++ as compared to say Java or Python, but I rarely see Objective-C mentioned. Roughly where does it fall in terms of language ...
0
votes
1answer
271 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 ...
1
vote
6answers
892 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 ...
0
votes
1answer
149 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 ...
2
votes
1answer
421 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 ...
0
votes
4answers
315 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 ...
7
votes
3answers
267 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 ...
2
votes
4answers
320 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 ...
3
votes
3answers
305 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 ...
2
votes
2answers
275 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 ...