iOS开发中对NSArray或者NSMutableArray中的内容排序

2023-09-10 阅读 22 评论 0

摘要：原文引用至 http://blog.unieagle.net/2012/05/10/ios开发中对nsarray或者nsmutablearray中的内容排序/ NSMutableArray *feedsBuffer; //初始化buffer以及填充数据 //....... //排序只需要两句话:已针对数组内对象的publishTime属性(NSDate)排序为例： NSSortDes

原文引用至 http://blog.unieagle.net/2012/05/10/ios开发中对nsarray或者nsmutablearray中的内容排序/

NSMutableArray *feedsBuffer;
//初始化buffer以及填充数据
//.......
//排序只需要两句话:已针对数组内对象的publishTime属性(NSDate)排序为例：
NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"publishTime" ascending:NO];
[feedsBuffer sortUsingDescriptors:[NSArray arrayWithObject:sortDescriptor]];//假如feedsBuffer是NSArray，那么有一个方法是

NSArray *sortedArray = [feedsBuffer sortedArrayUsingDescriptors:[NSArray arrayWithObject:sortDescriptor]];//如果排序的依据比较复杂，那么可以使用Block进行大小判断自定义：

[feedsBuffer sortUsingComparator:^NSComparisonResult(id obj1, id obj2) {
//返回三者其一:NSOrderedAscending, NSOrderedSame, NSOrderedDescending
return NSOrderedSame;
}];

ios基于什么开发？我的项目是要对未读消息进行靠前排序

- (void)reloadNuReadMsgCount
{NSMutableDictionary *sessionDic = [[IMMsgDBAccess sharedInstance] loadAllSessions];NSArray *allSession = [sessionDic allValues];for (NSMutableDictionary *dic in _dataArray) {for ( ECSession* session in allSession) {NSString *sessionId = session.sessionId;NSString *ronggroupid = [dic objectForKey:@"ronggroupid"];if ([sessionId isEqualToString:ronggroupid]) {[dic setValue:[NSString stringWithFormat:@"%ld", (long)session.unreadCount] forKey:MsgUnReadCount];}}}// 根据字典里的  MsgUnReadCount  属性来排序未读消息NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"MsgUnReadCount" ascending:NO];[_dataArray sortUsingDescriptors:[NSArray arrayWithObject:sortDescriptor]];NSLog(@"%@",_dataArray);[_contentTableView reloadData];
}