CODEWITHSUNDEEP
ios
hazem
hazem

Reputation: 289

sortedArrayUsingComparator in sorting array contains object with 2 numbers

iam trying to sort a object with 2 numbers using the api sortedArrayUsingComparator 

array1= [array sortedArrayUsingComparator:^NSComparisonResult(id obj1, id obj2) {

    person *p1 = (person*)obj1;
    person *p2 = (person*)obj2;

    if (p1.value>p2.value && p1.age>p2.age)
    {
        return (NSComparisonResult)NSOrderedAscending;
    }
    else
        return (NSComparisonResult)NSOrderedDescending;
}];

i want to make code to sort something like this ,,,,

input : 0  1
        1  2
        0  9
        1  4
        2  3

output: 0  1
        0  9
        1  2
        1  4 
        2  3

Upvotes: 3

Views: 7438

Answers (2)

Joe
Joe

Reputation: 57179

I would recommend sorting with NSSortDescriptors:

NSArray *sortdesc = @[
                      [NSSortDescriptor sortDescriptorWithKey:@"value" ascending:YES],
                      [NSSortDescriptor sortDescriptorWithKey:@"age" ascending:YES]
                     ];
NSLog(@"%@", [array sortedArrayUsingDescriptors:sortdesc]);

Upvotes: 5

user529758
user529758

Reputation:

  1. Please don't cast id to person *. The type id is implicitly compatible with any Objective-C object type, so the cast is useless and it only decreases readability.

  2. Also, class names should begin with a capital letter. Better name your class Person, not person.

  3. The actual problem is somewhat similar to lexicographic sorting:

NSArray *sorted = [unsorted sortedArrayUsingComparator:^NSComparisonResult(id lhs, id rhs) {
    Person *p1 = lhs, *p2 = rhs;

    if (p1.value > p2.value) {
        return NSOrderedAscending;
    } else if (p1.value < p2.value) {
        return NSOrderedDescending;
    } else {
        if (p1.age > p2.age)
            return NSOrderedAscending;
        else if (p1.age < p2.age)
            return NSOrderedDescending;
        else
            return NSOrderedSame;
    }
}];

Upvotes: 14

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