iOS 排序相关

根据对象里时间排序
@"bg_updateTime"为时间字段，array为对象数组

//降序NO 升序YES
NSMutableArray *muarray = [NSMutableArray arrayWithArray:array];
NSSortDescriptor *sort = [NSSortDescriptor sortDescriptorWithKey:@"bg_updateTime" ascending:NO];
 [muarray sortUsingDescriptors:[NSArray arrayWithObject:sort]];
 NSLog(@"%@", muarray);