Loading a table view (inside a view controller) with SQLite information - ios

Question

I have a view that is inserting information into the database. This view displays that information inside a table view (top half of view is being used for something else)
I have the view controller's class, an object class, and a table view cell class (this is what's throwing me off I think because the image and text labels are in here whereas the actual database information is in the view controller).
Here's the NSObject class:
// car.h
#import <Foundation/Foundation.h>
#interface Car : NSObject {
NSString *displayedMake;
NSString *displayedModel;
NSString *displayedImage;
}
#property (nonatomic, strong) NSString *displayedMake;
#property (nonatomic, strong) NSString *displayedModel;
#property (nonatomic, strong) NSString *displayedImage;
-(id)initWithName:(NSString *)n description:(NSString *)d url:(NSString *)u;
#end
//car.m
#import "Car.h"
#implementation Car
#synthesize displayedMake, displayedModel, displayedImage;
-(id)initWithName:(NSString *)n description:(NSString *)d url:(NSString *)u {
self.displayedMake = n;
self.displayedModel = d;
self.displayedImage = u;
return self;
}
#end
Here's the table view cell class:
//DisplayCarsCell.h
#import <UIKit/UIKit.h>
#interface DisplayCarsCell : UITableViewCell
#property (nonatomic, strong) IBOutlet UIImageView *carImage;
#property (nonatomic, strong) IBOutlet UILabel *makeLabel;
#property (nonatomic, strong) IBOutlet UILabel *modelLabel;
#end
//DisplayCarsCell.m
#import "DisplayCarsCell.h"
#import "ViewController.h"
#implementation DisplayCarsCell
- (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier
{
self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
if (self) {
// Initialization code
}
return self;
}
- (void)setSelected:(BOOL)selected animated:(BOOL)animated
{
[super setSelected:selected animated:animated];
// Configure the view for the selected state
}
#end
And finally, the view controller:
//ViewController.h
#import <UIKit/UIKit.h>
#import "/usr/include/sqlite3.h"
#interface ViewController : UIViewController <UITableViewDelegate> {
//NSString *databasePath;
sqlite3 *carsDB;
NSArray *carImages;
NSMutableArray *cars;
}
#property (nonatomic, retain) NSMutableArray *cars;
#property (strong, nonatomic) IBOutlet UILabel *status;
#end
//ViewController.m
#import "ViewController.h"
#import "DisplayCarsCell.h"
#import "Car.h"
#interface ViewController ()
#end
#implementation ViewController
#synthesize cars;
-(NSString *) filePath {
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
return [[paths objectAtIndex:0] stringByAppendingPathComponent:#"cars.db"];
}
-(void) openDB {
if (sqlite3_open([[self filePath]UTF8String],&carsDB) != SQLITE_OK){
sqlite3_close(carsDB);
NSAssert(0, #"Database failed to open");
}
else{
NSLog(#"database opened");
}
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
// Opens the database and creates the table if its the first time
[self readCarsFromDatabase];
}
- (void)readCarsFromDatabase
{
// Setup the database object
//sqlite3 *database;
// Init the animals Array
cars = [[NSMutableArray alloc] init];
// Open the database from the users filessytem
[self openDB];
const char *sql_stmt = "CREATE TABLE IF NOT EXISTS apps (name text, id text, image text)";
if (sqlite3_exec(carsDB, sql_stmt, NULL, NULL, NULL) == SQLITE_OK)
{
NSLog(#"create db");
}
//Setup the SQL Statement and compile it for faster access
const char *sqlStatement = "select * from apps";
sqlite3_stmt *compiledStatement;
if(sqlite3_prepare_v2(carsDB, sqlStatement, -1, &compiledStatement, NULL) == SQLITE_OK) {
// Loop through the results and add them to the feeds array
while(sqlite3_step(compiledStatement) == SQLITE_ROW) {
// Read the data from the result row
//image, or first column in table
NSString *displayedImage=[NSString stringWithFormat: #"%s",(const char *)sqlite3_column_text(compiledStatement, 0)];
//name, or second column in table
NSString *displayedMake=[NSString stringWithFormat: #"%s",(const char *)sqlite3_column_text(compiledStatement, 1)];
//model, or third column in table
NSString *displayedModel=[NSString stringWithFormat: #"%s",(const char *)sqlite3_column_text(compiledStatement, 2)];
NSLog(#"%#, %#, %#",displayedImage, displayedMake, displayedModel);
_status.text = displayedMake;
NSLog(#"here");
// Create a new animal object with the data from the database
Car *carObject = [Car alloc];
carObject.displayedImage = [NSString stringWithFormat: #"%s",(const char *)sqlite3_column_text(compiledStatement, 0)];
// Add the animal object to the animals Array
[cars addObject:carObject];
//NSLog(#"%#",displayedImage);
}
}
else
{
printf( "could not prepare statement: %s\n", sqlite3_errmsg(carsDB) );
}
// Release the compiled statement from memory
sqlite3_finalize(compiledStatement);
sqlite3_close(carsDB);
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
// Return the number of sections.
return 1;
}
#pragma mark Table view data source
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
// Return the number of rows in the section.
return carImages.count;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"DisplayCarsCell";
DisplayCarsCell *cell = [tableView
dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[DisplayCarsCell alloc]
initWithStyle:UITableViewCellStyleDefault
reuseIdentifier:CellIdentifier];
}
// Configure the cell...
//UIImage *displayedImage = [UIImage imageNamed:
//[carImage objectAtIndex: [indexPath row]]];
// Car *carObj = [cars objectAtIndex:indexPath.row];
ViewController *viewController = (ViewController *)[[UIApplication sharedApplication] delegate];
Car *car = (Car *)[viewController.cars objectAtIndex:indexPath.row];
//[cell setImage:car.displayedImage];
return cell;
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
// TODO: Select Item
NSLog(#"Selected");}
#end
The view controller itself is getting the array of data obviously from readCarsFromDatabase and is logging each row of the database correctly on viewDidLoad (did this to make sure that part wasn't wrong), but I need it to update the rows of the table view that is inside.

Answer 1

You have to call reloadData for your tableview once you're done adding records to cars, for example at the end of readCarsFromDatabase. I don't see an IBOutlet for the UITableView, but if it was simply tableView, then you'd add a line after sqlite3_close that says:
[self.tableView reloadData];
Obviously, make sure the table view's delegate is set to be your view controller.
Also, I would have thought that the following lines from your view controller's cellForRowAtIndexPath that currently say:
ViewController *viewController = (ViewController *)[[UIApplication sharedApplication] delegate];
Car *car = (Car *)[viewController.cars objectAtIndex:indexPath.row];
should be changed to simply say:
Car *car = self.cars[indexPath.row];