通过creationDate对PFObjects的NSMutableArray进行排序

Question

我如何通过creationDate对一系列PFObject进行排序？我尝试了类似下面的内容,但这并没有产生预期的结果.

 NSSortDescriptor *dateDescriptor = [NSSortDescriptor
                                 sortDescriptorWithKey:@"creationDate" 
                                             ascending:YES];
NSArray *sortDescriptors = [NSArray arrayWithObject:dateDescriptor];
NSArray *sortedEventArray = [nodeEventArray
         sortedArrayUsingDescriptors:sortDescriptors];

Answer 1

NSSortDescriptor *dateDescriptor = [NSSortDescriptor
                                 sortDescriptorWithKey:@"createdAt" 
                                             ascending:YES];
NSArray *sortDescriptors = [NSArray arrayWithObject:dateDescriptor];
NSArray *sortedEventArray = [nodeEventArray
         sortedArrayUsingDescriptors:sortDescriptors];

或者updatedAt最后更新.