How to set array value and key in NSDictionary in iphone?

Question

Here i am using NSMutableArray to store date, then i tried to set key and assign ArrayValue in dictionary but the app crashed, please help me

Thanks in ADvance

 Here i tried the code for your reference:

  [DateArray addObject:dateString]; //NSMutablArray 
  NSMutableDictionary *myDictionary =[[NSMutableDictionary alloc]init];         
  [myDictionary setObject:DateArray forKey:@"Date"]; //put array value and set key in NSDictionary.

Solution 1

NSDictionary Class is immutable. You must convert to NSMutableDictionary.

Solution 2

If you are using XCode version 4.4 or later you can jus do this:

[dateArray addObject:dateString]; //NSMutablArray 
NSDictionary *myDictionary = @{ @"Date", dateArray };

Solution 3

You are using NSDictionary. You should use NSMutableDictionary. NSDictionary is immutable. If you want to use NSDictionary then use below method:

- (id)initWithObjects:(NSArray *)objects forKeys:(NSArray *)keys;

Comments

[deanWombourne]

myDictionary isn't mutable - you can't call addObject:forKey: on it.

[Tripti Kumar]

check the question again before answering such a long answer.

[deanWombourne]

Hang on, did you edit it and change the class names from immutable to mutable? You've changed the question that is being asked; do you know the original questioner? Edit is designed to make the question more correctly asked, not to 'fix' it - if you want to fix the code, answer the question!

[Tripti Kumar]

Check out the name of Editor, don't blame me.

[SampathKumar]

Now i used NSMutableDictionary to store date fine, then How to sort this dictionary, is it possible?

[SampathKumar]

Now i used NSMutableDictionary to store date fine, then How to sort this dictionary, is it possible?

[Apurv]

dictionary can not be sorted. You can sort an array. Also you should accept my answer because I have given it before.

[bitmapdata.com]

refer a following q&a: stackoverflow.com/questions/4558639/sort-an-nsmutablediction‌​ary stackoverflow.com/questions/8118932/…

[Paul.s]

Your answer is pretty ambiguous. You have just given the method declaration without showing how to actually call it. This could very easily lead to any newbie using [NSDictionary initWithObjects:.... as this is where the method is declared.

[Paul.s]

There isn't actually any need to use a mutable dictionary here, instead just use the appropriate init method or new syntax.