使用字母顺序为特定对象的类对象排序NSMutableArray

Question

我有一个包含属性类对象的数组，如

for (int i=0; i<[eventList count]; i++) {

    NSDictionary *EventListDic=[eventList objectAtIndex:i];

    eventData.eventID=[EventListDic objectForKey:@"event_id"];
    eventData.eventsname=[EventListDic objectForKey:@"title"];

    [self.arrEventDataList addObject:eventData];
    [eventData release];

}

我想按字母顺序为eventData.eventsname键排序此数组。我尝试了以下功能，但它无法正常工作。请建议我如何做到这一点。提前致谢

 NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"title" ascending:NO];
 NSArray *orderedArray = [self.arrEventDataList sortedArrayUsingDescriptors:[NSArray arrayWithObject:sortDescriptor]];

我想按eventname排序我的arrEventDataList。

Answer 1

试试这个。

NSSortDescriptor *sortByName = [NSSortDescriptor sortDescriptorWithKey:@"eventsname"
                                                                 ascending:YES];
NSArray *sortDescriptors = [NSArray arrayWithObject:sortByName];
NSArray *sortedArray = [arrEventDataList sortedArrayUsingDescriptors:sortDescriptors];

您将拥有已排序的值。这会对您的arrEventDataList进行排序。

Answer 2

试一试......

NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"self" ascending:YES];
NSArray *sortedFloats = [eventData.eventsname sortedArrayUsingDescriptors:
                    [NSArray arrayWithObject:sortDescriptor]];
[sortDescriptor release];

// Put the two arrays into a dictionary as keys and values
NSDictionary *dictID = [NSDictionary dictionaryWithObjects:eventData.eventID  forKeys:eventData.eventsname];

// Sort the second array based on the sorted first array
sortedID = [dictID objectsForKeys:sortedFloats notFoundMarker:[NSNull null]];