Question

first of all, I have a class which mamages an NSMutableArray.
When the class is instantiated, it should look if there is already a saved array and load it, or otherwise made a new one.

everytime an item is added it should be saved. but: nothing happens.

#import "NEList.h"

@interface NEList()



@end

@implementation NEList
@synthesize theInternArray;



-(id) initWithArray {
    self = [super init];

    if(self != nil) {
             NSLog(@"build");

        theInternArray = [[NSMutableArray alloc] initWithCapacity:20];

        return self;
    }
    return nil;
}

-(id) initWithContent {
    self = [super init];

    if(self != nil) {
        NSLog(@"load");

        NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
        NSString *documentsDirectory = [paths objectAtIndex:0];
        NSString *filePath = [documentsDirectory stringByAppendingPathComponent:@"theFiles"];

        theInternArray = [NSMutableArray arrayWithContentsOfFile:filePath];

        if(theInternArray == nil) {
            theInternArray = [[NSMutableArray alloc] initWithCapacity:200];
        }
               NSLog(@"second %@", theInternArray);
        return self;
    }
    return nil;
}

-(BOOL) save {

   NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
  NSString *documentsDirectory = [paths objectAtIndex:0];
   NSString *filePath = [documentsDirectory stringByAppendingPathComponent:@"theFiles"];


    return [self.theInternArray writeToFile:filePath atomically:NO];
}

-(BOOL) addObject:(NEListItem *)theItem {

    [theInternArray addObject:theItem];    [self save];





    UILocalNotification *localNotif = [[UILocalNotification alloc] init];

    localNotif.fireDate = theItem.theBestBeforeDate;
    localNotif.timeZone = [NSTimeZone defaultTimeZone];

    localNotif.alertBody = [theItem.theName stringByAppendingString:@" expires!"];
    localNotif.alertAction = NSLocalizedString(@"View Details", nil);

    localNotif.soundName = UILocalNotificationDefaultSoundName;
    localNotif.applicationIconBadgeNumber = 1;



    [[UIApplication sharedApplication] scheduleLocalNotification:localNotif];


    return true;
}


-(NEListItem *) getElementAtIndex:(NSUInteger)theIndex {
    return [theInternArray objectAtIndex:theIndex];
}

-(BOOL)removeObjectByName:(NSString *)theName {

    for (NEListItem *tempItem in theInternArray) {

        if([tempItem.theName isEqualToString:theName]) {
            [theInternArray removeObject:tempItem];
            break;
            return true;
            }
    }

            NSLog(@"Nicht gefunden");
            return false;
        }






@end

the save method is called in another class which owns an instance of NEList

Answer 1

Ok, all I changed was the “initWithContent” Method and the save method. I’ve commented out your code and under it made the changes to use NSUserDefaults. NSUserDefaults should save a binary file of your Array and later get it back and convert it back to a NSArray. If this doesn’t work just let me know what error your getting.

-(id) initWithContent {
    self = [super init];

    if(self != nil) {
        NSLog(@"load");
        /*
        NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
        NSString *documentsDirectory = [paths objectAtIndex:0];
        NSString *filePath = [documentsDirectory stringByAppendingPathComponent:@"theFiles"];

        theInternArray = [NSMutableArray arrayWithContentsOfFile:filePath];

        if(theInternArray == nil) {
            theInternArray = [[NSMutableArray alloc] initWithCapacity:200];
        }
        NSLog(@"second %@", theInternArray);*/
        NSUserDefaults *uDefaults = [NSUserDefaults standardUserDefaults];
        theInternArray = [uDefaults objectForKey:@"internArray"];
        if (!theInternArray)
        {
            theInternArray = [[NSMutableArray alloc] initWithCapacity:200];
        }
        NSLog(@"%@", theInternArray);

        return self;
    }
    return nil;
}

-(BOOL) save {

    /*NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSString *filePath = [documentsDirectory stringByAppendingPathComponent:@"theFiles"];*/

    NSUserDefaults *uDefaults = [NSUserDefaults standardUserDefaults];
    [uDefaults setObject:theInternArray forKey:@"internArray"];


    //return [self.theInternArray writeToFile:filePath atomically:NO];
    return [uDefaults objectForKey:@"internArray"];
}

Oh, and the reason why your way didn’t work is because it’s not that simple to save a file then get it back. You would need to print out your data from the array (like “item1,item2,item3, etc.” to the file, then parse it and create a NSArray with that data later.