sorting objects in NSMutableArray

Question

My NSMutableArray contain the list of GroupUser objects :

@interface GroupUser : NSObject {

    NSString *groupUser_name;//user name
    NSString *groupUser_customMsg;
    NSString *groupUser_emailId;
    NSString *groupUser_groupName;
    NSString *groupUser_aliasName;
    int groupUser_imageId;
    int groupUser_state;//whether user is online( value 0) offline(value 1) or busy(value 2)
    int groupUser_type;             
}

now i want to sort the list : 1. On the bases of groupUser_state 2. On the bases of groupUser_name

eg:: 1. Sam Offline(value 1) 2. Ravi Online(value 0) 3. Amit Online(value 0) 4. Ganga Online(value 0) 5. Durga Offline(value 1)

Output after sorting should be:: 1. Amit Online 2. Ganga Online 3. Ravi Online 4. Durga Offline 5. Sam Offline

Help me by providing code for the same.. Thanx in advance

i have tried sorting by name(using sortedArrayUsingComparator) and its done ... but i want to sort it by state first and then by the name — Saraswati
– Saraswati, Commented May 16, 2012 at 5:35

Allamaprabhu · Accepted Answer · 2012-05-16 05:10:42Z

2

NSSortDescriptor *desc=[NSSortDescriptor  sortDescriptorWithKey:@"groupUser_state" ascending:YES];
NSArray *yourArray;
[yourArray sortedArrayUsingDescriptors:[NSArray arrayWithObject:desc]];

answered May 16, 2012 at 5:10

Allamaprabhu

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2 Comments

Saraswati Over a year ago

Thanx every one who answered. With help of all links i got my solution NSArray sortedArray; NSSortDescriptor stateDescriptor = [[[NSSortDescriptor alloc] initWithKey:@"groupUser_state" ascending:NO] autorelease]; NSSortDescriptor* nameDescriptor = [[[NSSortDescriptor alloc] initWithKey:@"groupUser_name" ascending:YES] autorelease]; NSArray* sortDescriptors = [NSArray arrayWithObjects:stateDescriptor, nameDescriptor, nil]; sortedArray = [[m_appDelegate groupUsersList] sortedArrayUsingDescriptors:sortDescriptors]; Feel free to comment on this solution .. if in any sense i can improve it

lnafziger Over a year ago

@Saraswati When adding code like this, it is a good idea to edit your original question and add the solution to the end or add your own answer so that people can actually read it.

Nicolas Miari · Accepted Answer · 2012-05-16 05:20:44Z

Alternatively, you can call NSMutableArray's -sortUsingSelector:, but your custom objects should provide a method for making the comparisons, something like this:

- (NSComparisonResult) compareSomeVariable:(GroupUser*) otherUser
{
    // Assumes ivar _someVariable is numeric; use NSString methods to compare
    // strings, etc.

    if(this->_someVariable < otherObject->_someVariable){
        return NSOrderedAscending;
    }
    else if(this->_someVariable > otherObject->_someVariable){
        return NSOrderedDescending;
    }
    else{
        return NSOrderedSame;
    }
}

and the sort them like this:

[array sortUsingSelector:@selector(compareSomeVariable:)];

The drawback is that you have to define this custom method in your class. You can have several different methods to sort your objects according to different criteria.

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