Add an object to a NSMutableArray using arrayWithObject

Question

This is my code:

NSMutableArray* notifications = [NSMutableArray arrayWithObjects:myObject.dictionary, nil];

After creating the NSMutableArray I do this:

NSData *jsonData = [NSJSONSerialization dataWithJSONObject:notifications options:NSJSONWritingPrettyPrinted error:&writeError];

How can I add other objects to the NSMutableArray notification?

I know I can do something like:

NSMutableArray* notifications = [NSMutableArray arrayWithObjects:object1.dictionary, object2.dictionary, object3.dictionary, nil];

but I want to add them after the creation of the NSMutableArray.

myObject contains this:

-(NSDictionary *)dictionary {
    return [NSDictionary dictionaryWithObjectsAndKeys:self.name,@"name",self.category,@"category",self.note, @"note",self.dueDate, @"dueDate",self.creationDate, @"creationDate", nil];}

Does this answer your question? How to append values to an array in Objective-C — koen
– koen, Commented Aug 21, 2020 at 12:07
No, because in this case I need to add an object using arrayWithObject:object.dictionary.. I update my question — l000000l
– l000000l, Commented Aug 21, 2020 at 12:15
I need to add an Object to notification, but as you can see, when I create the NSMutableArray notification I use arrayWithObjects:myObject.dictionary. How can I add another one in the same way? — l000000l
– l000000l, Commented Aug 21, 2020 at 13:02
Will this work: [notifications addObjectsFromArray: [NSMutableArray arrayWithObject: object.dictionary]] ? — koen
– koen, Commented Aug 21, 2020 at 13:15
Fantastic. If u write as a post I give u the accepted answer — l000000l
– l000000l, Commented Aug 21, 2020 at 13:18

koen · Accepted Answer · 2020-09-10 17:52:17Z

0

You can add one object as an array to an existing array as follows:

[notifications addObjectsFromArray: [NSArray arrayWithObject: object.dictionary]];

Alternatively, instead of arrayWithObject, you can also use the literal notation:

[notifications addObjectsFromArray: @[object.dictionary]];

You can add even more than one object at a time:

[notifications addObjectsFromArray: @[object1.dictionary, object2.dictionary]];

edited Sep 10, 2020 at 17:52

answered Aug 21, 2020 at 13:20

koen

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1 Comment

skaak Over a year ago

Hi - I'd simply use [NSArray arrayWithObject:... here, mutable is not required.

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