Iterate through an NSMutableArray of Objects

Question

I have a class with the following property and method:

header file below - note I did not copy/paste all code (only pertinant information):

@interface SQLiteDB : NSObject

@property (nonatomic, strong) NSMutableArray *allAccountsArray;
@property (nonatomic, strong) NSString *accountId, *accountName, *accountDescription, *accountTags, *accountPhoto, *accountCreationDate;

+(id) populateAccountObjectWithId:(NSString *)id andName:(NSString *)name andDescription:(NSString *)description andTags:(NSString *)tags andPhoto:(NSString *)photo andCreationDate:(NSString *)creationDate;

@end

implementation file below - note I did not copy/paste all code (only pertinant information):

+(id) populateAccountObjectWithId:(NSString *)id andName:(NSString *)name andDescription:(NSString *)description andTags:(NSString *)tags andPhoto:(NSString *)photo andCreationDate:(NSString *)creationDate
{
    SQLiteDB *mySQLiteDB = [[self alloc] init];
    mySQLiteDB.accountId = id;
    mySQLiteDB.accountName = name;
    mySQLiteDB.accountDescription = description;
    mySQLiteDB.accountTags = tags;
    mySQLiteDB.accountPhoto = photo;
    mySQLiteDB.accountCreationDate = creationDate;
    return mySQLiteDB;
}

Then, another method in the implementation file fetches all accounts from the SQLite database:

-(id) fetchAccountList
{   
    // do some database stuff here
    // create prepared statement, open database, etc...

    allAccountsArray = [[NSMutableArray alloc] init];

    while(sqlite3_step(statement) == SQLITE_ROW)
    {
        NSString *thisAccountId =              [[NSString alloc] initWithUTF8String:(const char *) sqlite3_column_text(statement,0)];
        NSString *thisAccountName =            [[NSString alloc] initWithUTF8String:(const char *) sqlite3_column_text(statement, 1)];
        NSString *thisAccountDescription =     [[NSString alloc] initWithUTF8String:(const char *) sqlite3_column_text(statement, 2)];
        NSString *thisAccountTags =            [[NSString alloc] initWithUTF8String:(const char *) sqlite3_column_text(statement, 3)];
        NSString *thisAccountPhoto =           [[NSString alloc] initWithUTF8String:(const char *) sqlite3_column_text(statement, 4)];
        NSString *thisAccountCreationDate =    [[NSString alloc] initWithUTF8String:(const char *) sqlite3_column_text(statement, 5)];

        [allAccountsArray addObject:[SQLiteDB populateAccountObjectWithId:thisAccountId andName:thisAccountName andDescription:thisAccountDescription andTags:thisAccountTags andPhoto:thisAccountPhoto andCreationDate:thisAccountCreationDate]];

    }
    // error handling code, etc.
    // finalize, & close code here...

return allAccountsArray;

}

Now finally the question. In other classes I want to do stuff with the array of objects that this returns. For instance I would do this in a TableVeiw controller:

-(void)loadView
{
    [super loadView];

    mySQLiteDB = [[SQLiteDB alloc] init];
    allAccountsArray = [mySQLiteDB fetchAccountList]; 
}

I would use this later to for instance populate the table list in the cellForRowAtIndexPath method. Perhaps each cell of the table would contain the accountName, accountDescription, and accountCreationDate. I do not however know how to access that name, desc, date from within the array of objects...

This obviously produces an error:

cell.textLabel.text = [allAccountsArray objectAtIndex:indexPath.row];

because the object at "row" is an "object" containing name, desc, date, etc...

So Stackoverflow, I ask you... How do I accomplish getting the object variables at each element of the array?

ennuikiller · Accepted Answer · 2011-12-18 15:52:06Z

2

You should be able to do something as simple as this:

SqliteDB *mySqliteDB = (SQliteDB *)[allAccountsArray objectAtIndex:indexPath.row];
NSString *myText = mySqliteDB.thisAccountID;
myText = [myText stringByAppendingString:mySqliteDB.thisAccountName];
.... etc.
cell.textLabel.text = myText;

answered Dec 18, 2011 at 15:52

ennuikiller

47.1k15 gold badges115 silver badges137 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

jxpx777 · Accepted Answer · 2011-12-18 15:59:24Z

1

I think enumerateObjects:usingBlock: is what you want for iterating, i.e. enumerating, objects. You might have missed it because it's in the superclass.

answered Dec 18, 2011 at 15:59

jxpx777

3,6414 gold badges30 silver badges43 bronze badges

1 Comment

ElasticThoughts Over a year ago

Hummm, ok I've never used enumerateObjects:usingBlock: however will look into it! Thanks for posting! FYI -- I'm about 4 weeks into ever developing anything using Obj C.

Collectives™ on Stack Overflow

Iterate through an NSMutableArray of Objects

2 Answers 2

Comments

1 Comment

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

1 Comment

Related