ios - Core Data segue issue with saving changes -


i had project working, , decided introduce settings page users make basic adjustments.

entity name: "setting" attribute: "settingtimeoverrideslider" -> created nsmanagedobject subclass

i added (and embedded) settingsviewcontroller, segue, named segue.

on page i'm using button save changes. button called method in coreviewcontroller via [super saveanddismiss] , know gets in there (checked nslog).

here's method:

-(void)saveanddismiss {     nslog(@"in save , dismiss");     nserror *error = nil;     if ([self.managedobjectcontext haschanges]) {         nslog(@"in save , dismiss - has changes");         if (![self.managedobjectcontext save:&error]) {                 // save failed             nslog(@"save failed: %@", [error localizeddescription]);         } else {                                                        // save succeeded             nslog(@"save succeeded");         }     }     [self dismissviewcontrolleranimated:yes completion:nil];     }

but reason, never gets first if(), have next debug nslog.

i believe problem prepareforsegue in main page, other segues going tableviews. i'm not sure if have segue setup right

-(void)prepareforsegue:(uistoryboardsegue *)segue sender:(uitableviewcell*)sender {     // segues 1-3     if ([[segue identifier]isequaltostring:@"segue4"])     {         // other segue     }      if ([[segue identifier]isequaltostring:@"tosettings"])     {         uinavigationcontroller *settingsviewcontroller = segue.destinationviewcontroller;          settingsviewcontroller *editsettingsviewcontroller = (settingsviewcontroller*)settingsviewcontroller.topviewcontroller;          nsindexpath *indexpath = [self.fetchedresultscontroller objectatindexpath:0];          setting *editsettings = (setting*)[self.fetchedresultscontroller objectatindexpath:indexpath];          editsettingsviewcontroller.editsetting = editsettings;     } }

in settingsviewcontroller.h, subclass settingsviewcontroller part of coreviewcontroller so:

// settingsviewcontroller.h #import <uikit/uikit.h> #import "setting.h" #import "coreviewcontroller.h"  @interface settingsviewcontroller : coreviewcontroller @property (nonatomic, strong)setting editsetting;  @property (nonatomic, strong)setting *editsetting; @property (strong, nonatomic) iboutlet uibarbuttonitem *editsavebutton; @property (strong, nonatomic) iboutlet uitextfield *timeoverridetextlabel; @property (strong, nonatomic) iboutlet uisegmentedcontrol *timeformatselector; @property (strong, nonatomic) iboutlet uiswitch *timeoverrideslider;  - (ibaction)cancel:(uibarbuttonitem *)sender; - (ibaction)editsave:(uibarbuttonitem *)sender; - (ibaction)timeoverride:(uiswitch *)sender;

now i'm trying retrieve information persistent memory, need change above statement to

@interface settingsviewcontroller : coreviewcontroller     <nsfetchedresultscontrollerdelegate>

?

//settingsviewcontroller.m #import "settingsviewcontroller.h" #import "appdelegate.h"  @interface settingsviewcontroller ()  @property (nonatomic, strong)nsmanagedobjectcontext *managedobjectcontext; @property (nonatomic, strong)nsfetchedresultscontroller *fetchedresultscontroller;

can't seem wrap head around what's wrong here, i'm sure in prepareforsegue method (listed above).

like said, other segue if-statement used link tableviews , work fine.

i'm trying set attribute this

editsetting.settingtimeoverrideslider = @yes;

and call 

[super saveanddismiss];   - (ibaction)editsave:(uibarbuttonitem *)sender {     if ([_editsavebutton.title isequaltostring:@"edit"])     {         [self settitle:@"edit settings"];          _timeformatselector.userinteractionenabled = yes;         _timeoverrideslider.userinteractionenabled = yes;          _editsavebutton.title = @"save";     } else if ([_editsavebutton.title isequaltostring:@"save"])     {         [self settitle:@"settings"];          nslog(@"saving-svc");         editsetting.settingtimeoverrideslider = @yes; // should change in core data         [super saveanddismiss];     } }

you shouldn't send in fetchedresultscontroller nor managedobjectcontext settingsviewcontroller. should limit amount of information needs configured possible. sending in editsetting, enough information achieve results want.

in settingsviewcontroller, delete following 2 lines:

@property (nonatomic, strong)nsmanagedobjectcontext *managedobjectcontext; @property (nonatomic, strong)nsfetchedresultscontroller *fetchedresultscontroller;

instead, should access managed object context nsmanagedobject directly.

your saveanddismiss should this:

-(void)saveanddismiss {     nslog(@"in save , dismiss");     nserror *error = nil;     if ([self.editsetting.managedobjectcontext haschanges]) {         nslog(@"in save , dismiss - has changes");         if (![self.editsetting.managedobjectcontext save:&error]) {                 // save failed             nslog(@"save failed: %@", [error localizeddescription]);         } else {                                                        // save succeeded             nslog(@"save succeeded");         }     }     [self dismissviewcontrolleranimated:yes completion:nil];     }

notice how self.managedobjectcontext became self.editsetting.managedobjectcontext.

better yet, can change [self.editsetting.managedobjectcontext haschanges] [self.editsetting isupdated].


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