How to fetch data from coreData in xcode6 - xcode6

Question

I am new to iOS development and I am using XCode 6.
I am working on coredata and I have already done save, delete, and update data on coredata but now I am not able to search existing data from coreData.so please can anyone tell me how can i do?

Answer 1

ViewController.h
import
#interface SecondViewController : UIViewController<UITableViewDataSource,UITableViewDelegate>
{
IBOutlet UITableView *tableview;
}
#property (strong) NSMutableArray *devices;
- (IBAction)goBack:(id)sender;
#end
ViewController.m
#import "SecondViewController.h"
#import <CoreData/CoreData.h>
#interface SecondViewController ()
{
NSManagedObjectContext *context ;
}
#end
#implementation SecondViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
}
- (NSManagedObjectContext *)managedObjectContext
{
context = nil;
id delegate = [[UIApplication sharedApplication] delegate];
if ([delegate performSelector:#selector(managedObjectContext)]) {
context = [delegate managedObjectContext];
}
return context;
}
- (void)viewDidAppear:(BOOL)animated
{
[super viewDidAppear:animated];
// Fetch the devices from persistent data store
NSManagedObjectContext *managedObjectContext = [self managedObjectContext];
NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] initWithEntityName:#"Device"];
self.devices = [[managedObjectContext executeFetchRequest:fetchRequest error:nil] mutableCopy];
[tableview reloadData];
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
// Return the number of sections.
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection: (NSInteger)section
{
// Return the number of rows in the section.
return self.devices.count;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
// Configure the cell...
NSManagedObject *device = [self.devices objectAtIndex:indexPath.row];
[cell.textLabel setText:[NSString stringWithFormat:#"%# ", [device valueForKey:#"name1"]]];
return cell;
}