自定义 Class 对象的排序数组

Question

I am facing problem that is of sorting. The scenario is explained as: i have a class (Suppose of person) and it has suppose 4 attributes (firstName, lastName, Address, salary) i am creating its object and making a collection of all attributes and putting this object in a NSMutableArray and so on. So at every index of array i have one object (ie collection of 4 attributes). Now i want to sort that array on the basis of salary can anyone help me out regarding this problem, will be thankful.,

Answer 1

See the documentation for NSArray. It has several sorting methods. Search for the word "sort" and you'll find 'em. (You'll want either the block based or function based API).

Answer 2

use this

NSSortDescriptor *sorter = [[[NSSortDescriptor alloc] initWithKey:@"salary" ascending:YES] autorelease];
NSArray *sortDescriptors = [NSArray arrayWithObject: sorter];
    [yorArrary sortUsingDescriptors:sortDescriptors];

Answer 3

Either you implement a compare-method for your object:

- (NSComparisonResult)compare:(Person *)otherObject {
return [self.birthDate compare:otherObject.birthDate];
 }

 NSArray *sortedArray;
 sortedArray = [drinkDetails sortedArrayUsingSelector:@selector(compare:)];

or usually even better: (The default sorting selector of NSSortDescriptor is compare:)

NSSortDescriptor *sortDescriptor;
sortDescriptor = [[[NSSortDescriptor alloc] initWithKey:@"birthDate"
                                          ascending:YES] autorelease];
NSArray *sortDescriptors = [NSArray arrayWithObject:sortDescriptor];
NSArray *sortedArray;
sortedArray = [drinkDetails sortedArrayUsingDescriptors:sortDescriptors];