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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Using Ruby for scripting in Objective-C [on hold]

I'm using Xcode 6.3.1 on OS X Yosemite, and I'm trying to use ruby as a scripting language in Objective-C. I've figured out how to load the Ruby framework and evaluate strings using rb_eval_string(), ...
0
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0answers
41 views

Singleton in Objective C [migrated]

What does the following method actually do? (This is created in an NSObject class.) + (MyClass *)sharedInstance { static MyClass *sharedInstance; static dispatch_once_t once; ...
3
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6answers
1k views

What are the Most Important things to know about iPhone Development? [on hold]

For example I just learned today about NARC. Never release something unless you made it "New, Alloced, Initialized or Copied". That just fixed a couple different bugs in my app that I couldn't find. ...
0
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1answer
64 views

Do iOS frameworks require the same internal versioning as OSX frameworks?

I have been reading through the apple documentation for creating frameworks for OSX and iOS. Reading about the structure of frameworks, I began to wonder if there is really any need to create the ...
0
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1answer
166 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. ...
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0answers
44 views

Objective-c anonymous property coding style

If I have an interface defined like @interface MyClass @property (nonatomic, copy, readonly) NSString *myString; @end so that myString is externally visible but can't be written, what would be ...
11
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1answer
461 views

Naming convention for iOS/OSX open-source projects

Not always but most of the time, you will find iOS or Mac OS X open-source projects with names starting with the initial letters of the author first and last names. If a project were to be authored by ...
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1answer
158 views

How static functions are better than Class Methods in Objective-C [closed]

I was going to through this post by Mattt Thompson in which he mentions that Static functions are nicer than shoe-horned class methods I just don't see any flaw with Class methods in ...
3
votes
1answer
163 views

How do you write tests for methods that interact with data in system files?

I'm trying to be proactive about writing an iOS app in a test-driven manner. However, I'm stumped as to how to test a method that is to interact with real system files. For those familiar with iOS, ...
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1answer
112 views

How come the keyword for declaring a class is 'interface' [closed]

What is the relationship between a class and an interface in objective-c? How come we declare a class using @interface instead of @class?
9
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2answers
518 views

Massive View Controller - IOS - Solutions

I'm sure every new iOS developer has the following problem: The View Controllers get very fast crowded with code for various purposes, easily getting to 500 + lines of code. This is how it looks like ...
1
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1answer
170 views

Does key-value observing between model and view violate MVC?

In MVC the Controller is the go-between for the View and the Model. So the Controller should be the one that observes or receives changes from the Model and View and updates the other accordingly. I ...
89
votes
5answers
34k 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 ...
2
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1answer
182 views

Performance of Class methods vs singleton instance methods

In my app, I'm using both strategies: I have a Utils class, it only has class methods that I call for doing common global methods, like NSString validation, etc. I have an app-wide singleton class ...
4
votes
2answers
423 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 ...
1
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1answer
306 views

Inheritance, Composition and Protocols

I'm reading a book on general object oriented concepts to try and gain a solid understanding of everything. One thing that is throwing me off is the difference between Inheritance and Composition. I ...
24
votes
3answers
1k views

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 ...
2
votes
1answer
2k 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 ...
7
votes
3answers
3k views

Is objective-C++ being phased out? [closed]

Is apple phasing out support for objective-c++? Note the following: In the Objective-C language manual, there used to be a section on mixing objective-c and c++. That section is now missing. Links ...
6
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1answer
3k views
1
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4answers
185 views

Security in an iOS game?

I'm part of a team building an iOS game which has multiplayer elements. A concern right now is how to make the game more secure, from user manipulation. I know there's a lot of multiplayer games out ...
4
votes
5answers
1k views

Are design patterns independent of programming languages?

I have been recently working on Objective C and came across use of Delegate pattern. I had seen most of the common patterns theoretically in Java, thanks to the Head First book. But at times looking ...
19
votes
6answers
1k views

The importance of duplicate code removal [duplicate]

I tried to explain to a coworker the gravity of having duplicate code in a project, on this piece of code: + (void)createIapInParse:(SKPaymentTransaction *)transaction { Reachability *reach = ...
0
votes
1answer
113 views

What effect does using multiple childViewControllers views inside a ContainerViewController have on memory?

I have three childViewController views inside my ContainerViewController and these three views are inside a horizontal scroll view. My intention is to build an app that has a custom camera on one ...
0
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1answer
69 views

Macro guard in Objective-C

I have noticed that many famous libraries written in Objective-C (eg. AFNetworking) use the macro guard inside their header files. Im aware that the #import directive, which works exactly like ...
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0answers
182 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 ...
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0answers
72 views

Can PhoneGap and RoboVm work in harmony?

The Goal is to make an iOS app using phonegap and java. When writing phonegap plugins that interact with native code (objective-c) would it be possible instead to make it interact with java when using ...
0
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1answer
215 views

Approach to managing multiple services like Evernote, Google drive, dropbox in iOS

I'm trying to think up a scenario when I'd have three different forms of NSData (or whatever) to be sent to three different services like Evernote, Google drive, Dropbox. Granted, each of those has ...
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votes
1answer
175 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
251 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
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1answer
140 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 ...
14
votes
4answers
6k 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 ...
0
votes
1answer
88 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 ...
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0answers
505 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 ...
3
votes
2answers
1k 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 ...
3
votes
1answer
717 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 ...
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2answers
293 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 ...
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votes
1answer
2k 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
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1answer
212 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 ...
1
vote
1answer
100 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
241 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
232 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
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0answers
49 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 ...
22
votes
2answers
7k 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
132 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
898 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
196 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
128 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 ...
4
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
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1answer
194 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 ...