Adding an object to NSMutableArray - weird behaviour

Question

I am facing a very weird issue. I create an object and I add it to a NSMutableArray but when I try to read it after I insert it, some subclasses of the object change to some weird classes like

PINGIFAnimatedImageManager

Here is the code I use to create the object and insert it to the NSMutableArray:

CustomContentGridRow *row = [[CustomContentGridRow alloc]init];
row.child1 = [dataManager getMapLocation]; // This is the MapLocation object that will change to this weird PINGIFAnimatedImageManager
row.useFullWidth=1;
row.index=0;
[arrCustomChilds addObject:row];

This is the CustomContentGridRow class:

@interface CustomContentGridRow : NSObject

@property (nonatomic, assign) MapLocation *child1;
@property (nonatomic, assign) MapLocation *child2;
@property (nonatomic, assign) int useFullWidth;
@property (nonatomic, assign) int index;

@end

So when I put a breakpoint at this line [arrCustomChilds addObject:hotelRow];, when I read the row object I get the expected results. But when I place a breakpoint after the above code to read the arrCustomChilds the class of child1 changes to some weird classes. Also, sometimes it won't change to another class but it will give nil values.

Any idea why this is happening?

You should change property modifier from "assign" to "strong" for class objects. — kirander
– kirander, Commented Feb 20, 2019 at 9:31
@kirander Yeap that's the answer. Please write it so I can accept it. — Student
– Student, Commented Feb 20, 2019 at 9:39

kirander · Accepted Answer · 2019-02-21 15:26:43Z

1

You should change property modifier from "assign" to "strong" for class objects. Otherwise undefined behaviour can happen.

answered Feb 21, 2019 at 15:26

kirander

2,24620 silver badges19 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Cintu · Accepted Answer · 2019-02-20 09:38:28Z

0

In Xcode -> Product -> Scheme - edit Scheme. Check the settings of RUN mode. If it is Release change to Debug.

This will give you the correct values

Change below properties

@property (nonatomic, strong) MapLocation *child1;
@property (nonatomic, strong) MapLocation *child2;

assign to strong

edited Feb 20, 2019 at 9:38

answered Feb 20, 2019 at 9:30

Cintu

9132 gold badges18 silver badges32 bronze badges

2 Comments

Sulthan Over a year ago

He's talking about breakpoins therefore obviously he is running in Debug.

Cintu Over a year ago

You can add breakpoints in release mode too. But you wont see proper results as it is not a debug mode

Besat · Accepted Answer · 2019-02-20 18:48:37Z

0

Your interface should be:

@interface CustomContentGridRow : NSObject

@property (nonatomic, strong) MapLocation *child1;
@property (nonatomic, strong) MapLocation *child2;
@property (nonatomic, assign) int useFullWidth;
@property (nonatomic, assign) int index;

@end

the class objects should be strong not assign

answered Feb 20, 2019 at 18:48

Besat

1,44813 silver badges29 bronze badges

Collectives™ on Stack Overflow

Adding an object to NSMutableArray - weird behaviour

3 Answers 3

Comments

2 Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

Comments

2 Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related