[NSManagedObject setSwitchState:]: unrecognized selector sent in Objective-C

Question

after checking all the answers of "Unrecognised selector sent" questions such as unrecognized selector sent to instance, and Unrecognized selector sent to instance? did not satisfy my situation so for that here is my full scenario:

Description:

in my app there exist a settings View which contain a UISwitch either to add all his reservation to the phone calendar or not.

so I need to save the choice of the user inside CoreData to add reservations to calendar or not i.e the state of the UISwitch.

initially when the app start for the first time the UISwitch will be ON and his state will be saved inside the CoreData with fixed ID 1 because I don`t want to add many Objects I need to keep only one object and when the user change the value of the UISwitch the app should update the object with new state I try this solution How to update existing object in Core Data? also I got an error

Full Code:

SwitchStateEntity.h

#import <Foundation/Foundation.h>
#import <CoreData/CoreData.h>
@interface switchState : NSManagedObject
@property(strong,nonatomic) NSNumber *switchId;
@property (nonatomic,strong) NSNumber *switchState;
@property (nonatomic,strong) NSNumber *showReminderAlert;
@end

SwitchStateEntity.m

#import "switchState.h"
@implementation switchState
@dynamic switchId;
@dynamic   switchState;
@dynamic showReminderAlert;
@end

SettingsViewController.h

#import <UIKit/UIKit.h>
#import "MakeReservationViewController.h"
@interface SettingsViewController : UIViewController
@property (weak, nonatomic) IBOutlet UISwitch *isAdedToCalendarOrNot;
@property (nonatomic) Boolean isSwitchOnOrOf;
@property (nonatomic,strong) NSString *savedEventId;
@end

SettingsViewController.m

- (IBAction)DoneButtonPressed:(id)sender {
    // check the state of the switch //
    // save this state //

    NSError *error;
    CoreData *coreDataStack = [CoreData defaultStack];
    NSArray *fetchedObjects;
    NSFetchRequest *fetchRequest;
    NSEntityDescription *entity;
    // setting up the variable needed //
    fetchRequest = [[NSFetchRequest alloc] init];

    entity = [NSEntityDescription entityForName:@"SwitchState" inManagedObjectContext:coreDataStack.managedObjectContext];
    [fetchRequest setPredicate:[NSPredicate predicateWithFormat:@"remindMeSwitchId== %d", 1]];
    [fetchRequest setEntity:entity];
    fetchedObjects = [coreDataStack.managedObjectContext executeFetchRequest:fetchRequest error:&error];
    NSLog(@"%@",fetchedObjects);

    for( NSEntityDescription *name in fetchedObjects)
    {
        NSLog(@"Switch Id is: %@",[name valueForKey:@"remindMeSwitchId"]);
        NSLog(@"Switch State is: %@",[name valueForKey:@"remindMeSwitchState"]);
        SwitchStateEntity *h  = [ fetchedObjects firstObject];
        [h setSwitchState:[NSNumber numberWithBool:self.isSwitchOnOrOf]];
        // after this statement i go into Unrecognised selector had been sent//  
        [coreDataStack saveContext];
        NSLog(@"Switch Id is: %@",[name valueForKey:@"remindMeSwitchId"]);
        NSLog(@"Switch State is: %@",[name valueForKey:@"remindMeSwitchState"]);
    }

    [self dismissSelf];
}

- (IBAction)isAdedToCalendarValueChanged:(id)sender {

    if ([self.isAdedToCalendarOrNot isOn]) {
        self.isSwitchOnOrOf = YES;
    }
    else
    {
        self.isSwitchOnOrOf = NO;
    }
}

and for the exception that the app goes through:

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[NSManagedObject setSwitchState:]: unrecognised selector sent to instance 0x7fb6f3411d20'

and for my xcdatamodel:

your entity name and attribute name are same.. and how did you create that class??? how did u create an entity name begin with lower case letter — Shebin Koshy, Aug 18 '15 at 10:59
@ShebinKoshy what do you mean i just implemented the EntityClass in my question if you mean the way that i created it by making new File Cocoa touch class — Zakaria Darwish, Aug 18 '15 at 11:44
SwitchStateEntity *h = [ fetchedObjects firstObject]; NSLog(@"it should not be nil = %@",self.isSwitchOnOrOf); [h setSwitchState:[NSNumber numberWithBool:self.isSwitchOnOrOf]]; — Shebin Koshy, Aug 19 '15 at 03:57

Gaurav Patel · Answer 1 · 2015-08-18T12:12:28.693

1

Update Code in Such File

SwitchStateEntity.h

#import <Foundation/Foundation.h>
#import <CoreData/CoreData.h>
@interface SwitchStateEntity : NSManagedObject
@property(strong,nonatomic) NSNumber *switchId;
@property (nonatomic,strong) NSNumber *switchState;
@property (nonatomic,strong) NSNumber *showReminderAlert;
@end

SwitchStateEntity.m

#import "SwitchStateEntity.h"
@implementation SwitchStateEntity
@dynamic switchId;
@dynamic   switchState;
@dynamic showReminderAlert;
@end

Also Update Entity name and class name in .xcdatamodeld file

edited Aug 18 '15 at 12:12

answered Aug 18 '15 at 12:07

Gaurav Patel

957
1
6
16

i just make what you did and i create new Entity inside the **xcdatamodel** and the same error appear – Zakaria Darwish Aug 18 '15 at 12:13
whats your class name ? and entity name in model? – Gaurav Patel Aug 18 '15 at 12:18
the class name is `SwitchStateEntity` and entity name in model is `SwitchStateEntity` – Zakaria Darwish Aug 18 '15 at 12:21
in SwitchStateEntity.h check interface define like "@interface SwitchStateEntity : NSManagedObject" – Gaurav Patel Aug 18 '15 at 12:22
already done and the error that`s really make me feel crazy:S – Zakaria Darwish Aug 18 '15 at 12:26
and if i NSLog(@"%@",fetchedObjects) i am able to get the object that stored initially the problem i think isn`t with **xcdatamodel** maybe it could be inside the EntityClass it self but i follow up your answer it drive me to the same situation **Unrecognised selector had been sent** and thats really annoying – Zakaria Darwish Aug 18 '15 at 12:29
have you remove completely from device and re-install app ? – Gaurav Patel Aug 18 '15 at 13:12
Let us [continue this discussion in chat](http://chat.stackoverflow.com/rooms/87338/discussion-between-gaurav-patel-and-zakaria-darwish). – Gaurav Patel Aug 19 '15 at 05:19

score 1 · Accepted Answer · answered Aug 19 '15 at 04:00

1

SwitchStateEntity *h = [ fetchedObjects firstObject]; 
//try this code
NSLog(@"it should not be nil = %@",self.isSwitchOnOrOf); 

[h setSwitchState:[NSNumber numberWithBool:self.isSwitchOnOrOf]];

answered Aug 19 '15 at 04:00

Shebin Koshy

1,182
8
22

Danny Bravo · Answer 3 · 2015-08-18T11:32:08.403

0

Do a NSLog("%@", NSStringFromClass(h.class)) to see what kind of class the SwitchState object really is. Chances are you've incorrectly configured something in your Core Data Model file.

Also, seriously, all your class names should be UpperCaseWords...

edited Aug 18 '15 at 11:32

answered Aug 18 '15 at 11:15

Danny Bravo

4,534
1
25
43

take a look to my code i just update it the log give me "SwitchStateEntity" – Zakaria Darwish Aug 18 '15 at 11:30
how can some people test the code that i have and works fine and when i run it on my app it doesn`t work :S – Zakaria Darwish Aug 18 '15 at 12:06

[NSManagedObject setSwitchState:]: unrecognized selector sent in Objective-C

3 Answers3