Stack Overflow
Stack Overflow

Questions tagged [unsafe-unretained]

17 questions
7
votes
1 answer

Is there way to check a `unowned` (actually `unowned(safe)`) reference has been deinited?

Is there any way to check an unowned(safe) Swift reference for "availability"? So, I am looking for a hypothetical function like isReferenceAccessible in this example: func someMethod() { someAsyncOperation(parameters) { [unowned(safe) self] in …
Valentin Shergin
  • 7,166
  • 2
  • 50
  • 53
3
votes
1 answer

Converting Project To ARC With Double Indirection Pointer Assign

I'm trying to convert a project to ARC. The project has a Directed Acyclic Word Graph, which basically means lots of double indirection pointers everywhere. This is proving quite a challenge to convert to ARC, and one issue in particular has me…
Max MacLeod
  • 26,115
  • 13
  • 104
  • 132
3
votes
2 answers

How to manage unsafe_unretained ivars/properties?

I started objective-c and iOS a couple of weeks ago (worth bearing in mind), and I apologise in advance for the awful diagram!! The above diagram shows the structure of my calls to a webservice. Thin arrows denote an object creating another…
dark_perfect
  • 1,458
  • 1
  • 23
  • 41
3
votes
3 answers

Should I use __unsafe_unretained for temp variables?

Let's say I want to create a temporary variable, e.g.: To point to another long-living variable: __unsafe_unretained UIView *tableHeaderView = self.tableView.tableHeaderView; To point to an object I just created. __unsafe_unretained UIView…
ma11hew28
  • 121,420
  • 116
  • 450
  • 651
3
votes
1 answer

What's the difference between takeUnretainedValue and takeRetainedValue?

What's the difference between takeUnretainedValue and takeRetainedValue? Based on Apple's documentation: Both of these methods return the original, unwrapped type of the object. You choose which method to use based on whether the API you are…
Aнгел
  • 1,361
  • 3
  • 17
  • 32
3
votes
2 answers

malloc object lifetime with __unsafe_unretained typecast

I'm new to Objective-C and ARC, and have been searching and reading for hours without finding an answer. The code does what I want it to do, but I want to know that it doesn't rely on favorable conditions. Here's a simplified version of my…
Anders Sjöqvist
  • 3,372
  • 4
  • 21
  • 22
2
votes
2 answers

Is it really a good option to use ARC for IOS 4.0 where there is no weak property

I am working on a ARC based project. My project is targeted IOS 4.3. Since there is no weak pointer for the version < IOS 5.0, I have to use unsafe_unretained which may cause dangling pointers. Now I am thinking, is it really, good option to use ARC…
Raj
  • 1,119
  • 1
  • 15
  • 32
1
vote
1 answer

Data withUnsafeBytes is deprecated

I got this code here from an app I am working on. I inherited this code when the BLE guy left the team. I am not good with low level stuff and Data stuff. I am UI/UX front end person, and now I do need to get my hands dirty. This code is now a bit…
Pascale Beaulac
  • 889
  • 10
  • 28
1
vote
0 answers

Memory management of static consts in Objective-C

I was watching the F8-2016 Building iOS Tooling at Facebook Scale video, when I've noticed an interesting code part at 7:01. Facebook defined a static constant in Objective-C this way: static __unsafe_unretained NSString * const kAuthorKey =…
Infinite Possibilities
  • 7,415
  • 13
  • 55
  • 118
1
vote
3 answers

New behaviour for IBOutlet creation in Xcode 6

I remember that in Xcode 5 if you dragged a view from a storyboard to the code it would create a property with weak attribute. Now in Xcode 6 it uses unsafe_unretained as a default. What may be the cause of that change?
Tomasz Bąk
  • 6,124
  • 3
  • 34
  • 48
1
vote
3 answers

property for ivar that points to two-dimensional array of pointers to NSStrings

I want to create a class that contains a dynamic, two-dimensional c-array of pointers to NSStrings. I know I can simulate a two-dimensional array using an NSArray containing multiple NSArrays, but if possible I'd like to do this using a traditional…
StephenAshley.developer
  • 1,054
  • 1
  • 9
  • 14
1
vote
1 answer

Returning __unsafe_unretained pointer to released object in Objective C causes a crash

Problem: I have an __unsafe_unretained id pointer that points to an already released object. So far so good, as long as I do not "use" the pointer at all (in particular, I do not call any method through the pointer). However, when I try to return…
Pang
  • 9,564
  • 146
  • 81
  • 122
0
votes
1 answer

dealing with autoreleased objects within dispatch_sync

What is the best solution to avoid bad access in this kind of situations ? __block NSString* string; dispatch_sync(dispatch_get_main_queue(), ^{ string = [NSString stringWithString:@"I'm autoreleased!"]; }); NSLog(@"My string is: %@",…
vtruant
  • 273
  • 1
  • 12
0
votes
2 answers

why delegates should be unsafe_unretained and not weak?

I added ARC to an app I'm working on. Unfortunately, it crashes. I found that the automatic script which updates all apps to ARC gave __unsafe_unretained qualifier to all id< protocolName> type. Why isn't it a weak type? I have deployed the app and…
yonivav
  • 994
  • 11
  • 18
0
votes
2 answers

To support iOS 4.3, use "assign" instead of weak, but Interface Builder uses unsafe_unretained?

To support iOS 4.3 with ARC, I think the proper way is to use assign: @property (assign, nonatomic) UIView *view; @property (assign, nonatomic) MYNode *node; Is that correct? I also see the following in Apple's doc for Transitioning to ARC: For…
Jeremy L
  • 3,770
  • 6
  • 41
  • 62
1
2