Question

IOS开发 coredata代码介绍

AppDelegate_iPad *appDelegate = (AppDelegate_iPad *)[[UIApplication sharedApplication]delegate];

NSError * error=nil;

NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];

// Edit the entity name as appropriate.

NSEntityDescription *entity = [NSEntityDescription entityForName:@"RecordDisplay" inManagedObjectContext:appDelegate.managedObjectContext];

[fetchRequest setEntity:entity];

NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"displayorder" ascending:YES];

NSArray *sortDescriptors = [[NSArray alloc] initWithObjects:sortDescriptor, nil];

[fetchRequest setSortDescriptors:sortDescriptors];

NSArray * objects=[appDelegate.managedObjectContext executeFetchRequest:fetchRequest error:&error];

// Edit the sort key as appropriate.

self.recorddisplayDate=[NSMutableArray arrayWithArray:objects];

[sortDescriptor release];

[sortDescriptors release];

[fetchRequest release];

IOS代码介绍

上面一段代码是什么意思啊？老是看不大明白，希望有知道的人给解释下…

Answer 1

这怎么说了，就是读取coredata里面的数据，显示出来，差不多就和在数据库里面查询表一样，去cocachina，devdiv看看，很快就明白了