数组中按时间排序

//遍历数据
[messKeyArray enumerateObjectsUsingBlock:^(NSDictionary *  _Nonnull messKeyDictionary, NSUInteger idx, BOOL * _Nonnull stop) {

#pragma mark --保存到数据库后字典转模型
DYMessageTableModel *model = [DYMessageTableModel messageTableModelWithDic:messKeyDictionary];

[nmArray addObject:model];
}];

NSArray *sortedArray = [nmArray sortedArrayUsingSelector:@selector(compareByDate:)];

//按时间排序
-(NSComparisonResult)compareByDate:(DYMessageTableModel *)model
{
NSDateFormatter *inputFormatter = [[NSDateFormatter alloc] init];
[inputFormatter setDateFormat:@"yyyyMMddHHmm"];
NSDate* firstDate = [inputFormatter dateFromString:[NSString stringWithFormat:@"%@",self.timeString]];
NSDate* secondeDate = [inputFormatter dateFromString:[NSString stringWithFormat:@"%@",model.timeString]];

return [secondeDate compare:firstDate];

}