IOS中Object-C按照NSDictionary中的某个Key排序的方法

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//create_time 降序 NSComparisonResult sort_desc(NSDictionary *firstDict, NSDictionary *secondDict, void *context) {     NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];     [dateFormatter setDateFormat:@"YYYY-MM-dd HH:mm:ss"];           long a = (long) [[dateFormatter dateFromString:[firstDict objectForKey:@"create_time"]] timeIntervalSince1970] * 1000;     long b = (long) [[dateFormatter dateFromString:[secondDict objectForKey:@"create_time"]] timeIntervalSince1970] * 1000;           if (a >= b)         return  NSOrderedAscending;     else         return  NSOrderedDescending; }         //调用 NSArray *array = [self.arr copy]; array = [array sortedArrayUsingFunction:sort_desc context:NULL];