Highest scored 'macos+objective-c' questions

338 votes

89 answers

241k views

Hidden Features of Xcode

With a huge influx of newbies to Xcode, I'm sure there are lots of Xcode tips and tricks to be shared. What are yours?

Community wiki

11 revs, 8 users 52%
Robert Harvey

241 votes

25 answers

109k views

Easy way to see saved NSUserDefaults?

Is there a way to see what's been saved to NSUserDefaults directly? I'd like to see if my data saved correctly.

Ethan

5,749

asked Nov 4, 2009 at 21:57

239 votes

5 answers

42k views

What kind of leaks does automatic reference counting in Objective-C not prevent or minimize?

In the Mac and iOS platforms, memory leaks are often caused by unreleased pointers. Traditionally, it has always been of utmost importance to check your allocs, copies and retains to make sure each ...

BoltClock

716k

asked Jun 7, 2011 at 3:08

212 votes

29 answers

536k views

Xcode build failure "Undefined symbols for architecture x86_64"

An Xcode beginner's question: It is my first experience with Xcode 4.6.3. I am trying to write a very simple console program, that searches for paired BT devices and prints them to an NSLog. It ...

RisingSun

2,447

asked Aug 23, 2013 at 17:27

211 votes

12 answers

136k views

Execute a terminal command from a Cocoa app

How can I execute a terminal command (like grep) from my Objective-C Cocoa application?

lostInTransit

70.8k

asked Jan 5, 2009 at 8:21

178 votes

13 answers

43k views

What is the best way to solve an Objective-C namespace collision?

Objective-C has no namespaces; it's much like C, everything is within one global namespace. Common practice is to prefix classes with initials, e.g. if you are working at IBM, you could prefix them ...

Mecki

131k

asked Oct 7, 2008 at 13:27

170 votes

7 answers

107k views

What's the difference between "bundle display name" and "bundle name" in cocoa application's info plist

Here is a good question: Bundle Name, Executable Name, Product Name...anything else? but I just wonder about the difference between "bundle display name" and "bundle name" in cocoa application's ...

xhan

6,217

asked Aug 12, 2010 at 8:06

163 votes

18 answers

127k views

Best way to change the background color for an NSView

I'm looking for the best way to change the backgroundColor of an NSView. I'd also like to be able to set the appropriate alpha mask for the NSView. Something like: myView.backgroundColor = [NSColor ...

BadPirate

26.1k

asked Jun 3, 2010 at 1:25

150 votes

21 answers

81k views

Xcode 5: Code signing entitlement errors

I've build a new application which is going to support IOS 7. I got the new XCode 5 GM and tried to sign my apps using my fresh provisioning profile and distribution certificate, but i'm having ...

Benjamin de Bos

4,346

asked Sep 15, 2013 at 23:05

146 votes

10 answers

79k views

Suppressing deprecated warnings in Xcode

With all the SDKs floating around, it's handy to be able to build for multiple SDKs and platforms. However, bouncing from 3.2 to 3.0 and even occasionally 2.x, I frequently get deprecated warnings ...

Ben Gottlieb

85.5k

asked Apr 12, 2010 at 12:33

130 votes

4 answers

29k views

What makes a keychain item unique (in iOS)?

My question concerns keychains in iOS (iPhone, iPad, ...). I think (but am not sure) that the implementation of keychains under Mac OS X raises the same question with the same answer. iOS provides ...

Hubert Schölnast

8,449

asked Jul 23, 2012 at 14:00

124 votes

2 answers

69k views

Convert NSURL to local file path

I have an NSURL that looks like this: file://localhost/Users/myuser/myfile.txt Is there a standard function to convert it to a local file path looking like this: /Users/myuser/myfile.txt

sashoalm

78k

asked Aug 5, 2011 at 12:33

117 votes

10 answers

78k views

How can I convert from degrees to radians?

I am trying to convert this Obj-C code to Swift code but I don't know what the equivalent of this code should be ? #define DEGREES_TO_RADIANS(degrees)((M_PI * degrees)/180) I googled and found this ...

Dharmesh Kheni

71.6k

asked Mar 21, 2015 at 5:46

116 votes

9 answers

74k views

Swift - which types to use? NSString or String

With the introduction of Swift I've been trying to get my head round the new language I'm an iOS developer and would use types such as NSString, NSInteger, NSDictionary in an application. I've ...

Alec

1,247

asked Jun 4, 2014 at 13:21

102 votes

9 answers

35k views

Xcode linker error: file too small for architecture x86_64

I'm developing an application in Xcode. When I try to build, this error comes up: ld: in /Users/theodore/Library/Developer/Xcode/DerivedData/Tower-bkpdifuqssebjdgurzmtirbxejnn/Build/Intermediates/...

tbodt

16.9k

asked Dec 25, 2012 at 21:17

92 votes

10 answers

41k views

View-based NSTableView with rows that have dynamic heights

I have an application with a view-based NSTableView in it. Inside this table view, I have rows that have cells that have content consisting of a multi-row NSTextField with word-wrap enabled. ...

Jiva DeVoe

1,338

asked Sep 21, 2011 at 18:10

86 votes

4 answers

116k views

Objective C - Assign, Copy, Retain

I'm new to Objective C. I have basic knowledge in C, including the concept of pointers. I have two basic questions: Can someone explain the difference between assign,copy, and retain with some ...

Sabha B

2,079

asked Dec 22, 2010 at 15:51

84 votes

5 answers

40k views

Where is a Mac Application's NSUserDefaults Data Stored?

I am using NSUserDefaults to store some data in my application. NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults]; [prefs setObject:@"dummy string" forKey:@"lastValue"]; [prefs ...

ahmadbaig

1,086

asked Nov 2, 2011 at 15:15

84 votes

4 answers

44k views

ARC - The meaning of __unsafe_unretained?

Just want to make sure that I got it right: Do I need to __unsafe_unretain objects that I don't own? If an object is __unsafe_unretained Do I need to use assign in the @property? Does that mean that ...

shannoga

19.8k

asked Dec 21, 2011 at 15:32

83 votes

2 answers

15k views

Cannot use respondsToSelector using ARC on Mac

When I call respondsToSelector in an ARC environment, I get the following error message Automatic Reference Counting Issue No known instance method for selector respondsToSelector: This is the header ...

David

14.4k

asked Oct 29, 2011 at 19:07

80 votes

3 answers

37k views

What is the strong property attribute

I am using the Xcode beta for developers, and am noticing some subtle differences. Among them is a new attribute for declared properties. @property(strong)IBOutlet NSArrayController *arrayControl; ...

Chance Hudson

2,859

asked Jul 14, 2011 at 23:09

79 votes

11 answers

56k views

NSArray Equivalent of Map

Given an NSArray of NSDictionary objects (containing similar objects and keys) is it possible to write perform a map to an array of specified key? For example, in Ruby it can be done with: array.map(&...

Stussa

3,405

asked May 25, 2011 at 16:20

76 votes

11 answers

103k views

Rounding numbers in Objective-C

I'm trying to do some number rounding and conversion to a string to enhance the output in an Objective-C program. I have a float value that I'd like to round to the nearest .5 and then use it to set ...

Ash

2,330

asked Apr 15, 2009 at 17:25

76 votes

8 answers

39k views

Enabling tabs in xcode? Or lessening the pain of not having them?

I am currently using xcode and I find it's lack of tabs quite disturbing. I currently use command-shift-d to search through all the files, or ctrl-1 to open the history of files that were recently ...

pbreault

14.4k

asked Jul 26, 2009 at 16:49

75 votes

1 answer

17k views

Xcode Project Format: what are the differences between 3.1, 3.2, 6.3 and 8.0?

When I open a project in Xcode 9 (or previous versions) and check the File Inspector, there's a section called Project Document, with a combo box named Project Format. The available options (in Xcode ...

Para

3,691

asked Jul 16, 2015 at 13:04

73 votes

1 answer

11k views

Do you need to create an NSAutoreleasePool within a block in GCD?

Normally, if you spawn a background thread or run an NSOperation on an NSOperationQueue you need to create an NSAutoreleasePool for that thread or operation because none exists by default. Does the ...

Brad Larson♦

170k

asked Nov 10, 2010 at 4:02

72 votes

11 answers

32k views

Turn off sound in iPhone Simulator

Is there an option to turn off the sound on the iPhone Simulator? Or to adjust the volume?

marko

1,356

asked Jul 7, 2010 at 14:32

70 votes

5 answers

41k views

Block implicitly retains 'self'; explicitly mention 'self' to indicate this is intended behavior

Given the following: - (void) someMethod { dispatch_async(dispatch_get_main_queue(), ^{ myTimer = [NSTimer scheduledTimerWithTimeInterval: 60 ...

Kyle

17.6k

asked Feb 5, 2014 at 12:45

69 votes

10 answers

68k views

How to get the file size given a path?

I have a path to file contained in an NSString. Is there a method to get its file size?

hekevintran

23.4k

asked May 2, 2009 at 19:43

69 votes

2 answers

3k views

tgmath.h doesn't work if modules are enabled

I looked into using tgmath.h to deal with the CGFloat typedef float/double mess when dealing with arm64. This answer has a pretty good description of how to use it, except that it didn't work at all ...

Dima

23.6k

asked Apr 28, 2014 at 5:41

68 votes

12 answers

22k views

Cocoa-Touch: How do I see if two NSDates are in the same day?

I need to know if two NSDate instances are both from the same day. Is there an easier/better way to do it than getting the NSDateComponents and comparing day/month/year?

Prody

5,250

asked Oct 13, 2009 at 16:59

68 votes

5 answers

109k views

List of all users and groups

I'm trying to get a list of all users and all groups on Mac OS X 10.5+. How can I do this? For example, the list of all users on my machine should return: _amavisd, _appowner, _appserver, _ard, ...

Dave DeLong

243k

asked Aug 20, 2009 at 1:53

65 votes

6 answers

58k views

Class Foo is implemented in both MyApp and MyAppTestCase. One of the two will be used. Which one is undefined

Recently I started Unit testing my application. This project (in Xcode4) was created without a unit test bundle so I had to set it up. I have followed the steps from here: http://cocoawithlove.com/...

nacho4d

44.7k

asked May 27, 2011 at 8:27

60 votes

6 answers

39k views

Sample code for creating a NSTextField "label"?

In my desktop Mac OS X app, I'd like to programatically create a NSTextField "label" which has the same behavior and properties as a typical label created in Interface Builder. I usually use (and ...

Todd Ditchendorf

11.3k

asked Oct 2, 2009 at 3:36

58 votes

2 answers

23k views

Send notification to Mountain lion notification center

Can someone give an example of sending a test notification from a Cocoa app to Notifications Center? eg. when I click on an NSButton

haseo98

837

asked Aug 5, 2012 at 8:11

58 votes

23 answers

39k views

Xcode: Could not inspect the application package

I am running Xcode 6 and iOS 8 GM. Every other time I run my app I get this message from Xcode: "Could not inspect the application package" So I can run and build, I will get the message. I run ...

Josh Kahane

17k

asked Sep 24, 2014 at 10:59

58 votes

1 answer

4k views

Setting Notifications on Characteristic results in Invalid Handle error

Using CoreBluetooth I want to send data from iPhone to Mac. For this I wrote code like iPhone as 'Peripheral' and Mac as 'Central'. It works perfectly, but sometimes it disconnects directly and then ...

Suresh

1,015

asked Aug 5, 2014 at 13:21

52 votes

3 answers

14k views

Why are umbrella frameworks discouraged? [closed]

I want to distribute Framework A. Framework A depends on Framework B. I want a user of my framework to only need to include Framework A, but still have programmatic access to Framework B. Apple does ...

Ben Dolman

3,175

asked Sep 9, 2011 at 17:58

50 votes

5 answers

22k views

How do I quit a mac application programmatically?

I need to add a quit-button to my application that runs from the menubar in mac. How do I programmatically quit an application in mac?

Man of One Way

3,960

asked Aug 8, 2011 at 22:15

50 votes

8 answers

30k views

How to Write OS X Finder plugin

I'm looking for a guide or sample code for writing Mac OS X Finder plugins? It would like to know how to do some simple actions: adding image overlayers to icons adding context menu items listen to ...

notnoop

59.1k

asked Aug 18, 2009 at 14:40

48 votes

6 answers

16k views

Callbacks When an NSScrollView is Scrolled?

I'm making a Mac app which needs to know when the user is scrolling the NSScrollView, however, I can't find any methods like UIScrollView, which has the following delegate methods: – ...

nonamelive

6,510

asked Mar 2, 2011 at 15:02

47 votes

9 answers

95k views

Target pattern contains no '%'. Makefile

I have searched this problem in google, but still don't have some way to resolve a problem. I have 2 Makefiles: One as example and one as my file. Example: BINDDIR=/src/binding XBUILD=/Applications/...

Mike

2,685

asked Feb 27, 2013 at 13:20

46 votes

4 answers

25k views

Deleting plist file does not reset app on macOS 10.9+

While developing a Cocoa application on 10.9, I have noticed that if I go to ~/Library/Preferences and delete the plist file for my app (to reset it), on the next build-and-run, the app behaves as if ...

Bryan

5,315

asked Oct 10, 2013 at 18:54

46 votes

1 answer

62k views

Is there a command-line interface to list all Bluetooth devices in range on mac? [closed]

I want to list all in-range Bluetooth devices, ideally with hostnames, but MAC addresses would be sufficient. I need a command that performs an active scan so I can poll to see if my device is nearby,...

Nick Sweeting

5,672

asked Jun 30, 2016 at 7:16

45 votes

8 answers

12k views

Launch Finder window with specific files selected

I'm trying to programmatically launch an OS X Finder window from an Xcode project. I need the window to open to a specific folder and have specific files within that folder automatically selected. ...

simon.d

2,491

asked Oct 4, 2011 at 19:14

44 votes

3 answers

36k views

How to get file size properly and convert it to MB, GB in Cocoa? [duplicate]

Possible Duplicate: ObjC/Cocoa class for converting size to human-readable string? I'm new in Cocoa. I'm trying to get size of folder files properly. And display it in MB if it less 1 GB , or in ...

User1234

2,392

asked Oct 21, 2011 at 7:50

44 votes

10 answers

69k views

How to use NSString drawInRect to center text?

How can I draw a NSString centered within a NSRect? I've started off with: (an extract from the drawRect method of my custom view) NSString* theString = ... [theString drawInRect:theRect ...

Steve Folly

8,487

asked Jan 25, 2009 at 10:34

42 votes

9 answers

22k views

Enable access for assistive devices programmatically on 10.9

I want to enable access for assistive devices programatically on 10.9. On 10.8 and lower I was using following Applescript to enable access for assistive devices: tell application "System Events" if ...

Vinpai

1,729

asked Jul 17, 2013 at 7:11

42 votes

3 answers

31k views

What's the difference between formal and informal protocols in Objective-C?

dontWatchMyProfile

46k

asked Jun 21, 2010 at 5:49

41 votes

4 answers

13k views

mouseEntered and mouseExited not called in NSImageView SubClass

I created a subclass of NSImageView to capture mouseEntered and mouseExited events. But only mouseUp and mouseDown events are getting called. How to capture the mouseEntered and mouseExited events in ...

Ram

1,890

asked Jun 25, 2012 at 10:58

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