对NSArray自定义对象应用排序

Question

I have an array of custom objects (really an NSSet stored in Core Data which becomes an NSArray with AllObjects) and each of these custom objects is a ListItem . Each ListItem belongs to a List , which has a uniqueID. Each ListItem has a different uniqueID which is the uniqueID of the List it belongs to + a number. So if the id of my List object is @"foo", then its ListItems would each have the property ListItem1.id = @"foo0", ListItem2.id = @"foo1", ListItem3.id = "foo2" etc..

So, how can I sort my array of custom objects based on the number that is appended to this uniqueID on each ListItem?

Answer 1

NSArray *sortedArray = [unsortedArray sortedArrayUsingComparator:^(ListItem *obj1, ListItem *obj2){
    return [obj1.id compare:obj2.id];
}];