objective-C IOS core data 使用NSPredicate查询

2012-03-29 03:14:19 545 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

SMPTE ST 2110 概论（一） SMPTE ST 2110 概论（一）前言ST 2110与ST 2022-6ST 2110-10：基本结构与时序ST 2110-20：未压缩的视频流后续前言这是一份我在实习期间制作的，关于SMPTE ST 2110的简单介绍。这篇文章主要以梳理总结 SMPTE ST 2110 的概念为主，关于具体的内容，比如IP数据报的格式、RTP时间戳的具体代码内容等等，大家可以查阅 SMPTE ST 2... 阅读详情

一个表里面有firstname ，lastname两个属性，我想查出firstname或者lastname中包含form的项
分别查我会，不知道怎么合并

NSString * searchTerm = [searchBar text];
[NSFetchedResultsController deleteCacheWithName:@"Master"];
NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
// Edit the entity name as appropriate.
NSEntityDescription *entity = [NSEntityDescription entityForName:@"Contact" inManagedObjectContext:self.managedObjectContext];
[fetchRequest setEntity:entity];

// Set the batch size to a suitable number.
[fetchRequest setFetchBatchSize:20];
NSString *form = [NSString stringWithFormat:@"%@*",searchTerm ];
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"(firstname like %@)",form];
// NSLog(@"%@",searchBar.text);
[fetchRequest setPredicate:predicate];
// Edit the sort key as appropriate.
NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"firstname" ascending:YES];
NSArray *sortDescriptors = [[NSArray alloc] initWithObjects:sortDescriptor, nil];

[fetchRequest setSortDescriptors:sortDescriptors];

// Edit the section name key path and cache name if appropriate.
// nil for section name key path means "no sections".
NSFetchedResultsController *aFetchedResultsController = [[NSFetchedResultsController alloc] initWithFetchRequest:fetchRequest managedObjectContext:self.managedObjectContext sectionNameKeyPath:nil cacheName:@"Master"];
aFetchedResultsController.delegate = self;
self.fetchedResultsController = aFetchedResultsController;

...全文