Getting error while inserting data to my table in database using 'storyboard' i.e “no visible interface…”?

问题

I'm new to IOS and this is My first crud operation on it And I named this App As BIDDatabaseApp

Kindly be gentle with me i am just a learner i am getting difficulty to debug this

problem.

I'm getting the error No visible @interface for BidProducts declares the selector nameProd and descProd which both are the properties at BidProducts , and the same error on NSArray with addObject

Now what i am doing is that i have make a database in Sqlite and use the storyboard with 3buttons for add view and delete.

OK, and this is my file hierarchy BIDProducts.h Sub-Class of NSObject

#import <Foundation/Foundation.h>

@interface BIDProducts : NSObject
@property (nonatomic, strong)NSString *nameProd;
@property (nonatomic, strong)NSString *descProd;


@end

BIDProducts.h

#import "BIDProducts.h"

@implementation BIDProducts
@synthesize nameProd,descProd;

@end

BIDViewController.h here in BIDViewcontroller.h file i am importing the sqlite3.h it is xcode is not getting it by code i am writing it in a static way and it is not giving any error and it is not making a connection with the db also. I am still not able to connect with database.

#import <UIKit/UIKit.h>
#import "sqlite3.h"
#import "BIDProducts.h"


@interface BIDViewController : UIViewController<UITableViewDataSource , UITableViewDelegate>

@property (weak, nonatomic) IBOutlet UITextField *txtNameFeild;
@property (weak, nonatomic) IBOutlet UITextField *txtDescFeild;
@property (weak, nonatomic) IBOutlet UITableView *txtAreaViewList;



- (IBAction)btnAddProduct:(id)sender;
- (IBAction)btnDeleteProduct:(id)sender;
- (IBAction)btnViewProduct:(id)sender;

@end

BIDViewController.M

#import "BIDViewController.h"
#import "BIDProducts.h"

@interface BIDViewController ()
{


    NSArray *arrayOFProducts;
    sqlite3 *productsDB;
    NSString *dbPathString;

}
@end

@implementation BIDViewController



- (void)viewDidLoad
{
    [super viewDidLoad];
    arrayOFProducts = [[NSMutableArray alloc]init];
    [[self txtAreaViewList]setDelegate:self];
    [[self txtAreaViewList]setDataSource:self];
    [self createOrOpenDb];
    // Do any additional setup after loading the view, typically from a nib.
}

-(void)createOrOpenDb
{
    NSArray *path = NSSearchPathForDirectoriesInDomains(NSDocumentationDirectory, NSUserDomainMask, YES);
    NSString *docPath = [path objectAtIndex:0];

    dbPathString = [docPath stringByAppendingPathComponent:@"productsDB.sqlite"];

    char *error;
    NSFileManager *fileManager = [NSFileManager defaultManager];

    if (![fileManager fileExistsAtPath:dbPathString]) {
        const char *dbPath = [dbPathString UTF8String];

        if (sqlite3_open(dbPath, &productsDB) == SQLITE_OK) {
            const char *sqlStmt = "CREATE TABLE IF NOT EXISTS TBLLISTPRODUCT (ID INTEGER PRIMERYKEY AUTOINCREMENT, PRODNAME VARCHAR, PRODDESC VARCHAR ) ";
            sqlite3_exec(productsDB, sqlStmt, NULL, NULL, &error);

            sqlite3_close(productsDB);

        }

    }


}

-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    return 1;
}

-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return [arrayOFProducts count];

}

-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = @"cell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];

    if (!cell) {
        cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier];

    }

BIDProducts *aProduct = [arrayOFProducts objectAtIndex:indexPath.row];

cell.textLabel.text = aProduct.nameProd;
cell.textLabel.text = aProduct.descProd;


return cell;


}



- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (IBAction)btnAddProduct:(id)sender {
    char *error;
    if (sqlite3_open([dbPathString UTF8String], &productsDB) == SQLITE_OK) {
        NSString *insertStmt = [NSString stringWithFormat:@"INSERT INTO TBLLISTPRODUCT(PRODNAME,PRODDESC) values ('%s', '%s') ", [self.txtNameFeild.text UTF8String] , [self.txtDescFeild.text UTF8String]];
        const char *insert_stmt = [insertStmt UTF8String];

        if (sqlite3_exec(productsDB, insert_stmt, NULL, NULL, &error) == SQLITE_OK) {
            NSLog(@"person added");
            BIDProducts *products = [[BIDProducts alloc]init];
            [products nameProd:self.txtNameFeild.text];

            [products descProd:self.txtDescFeild.text];

            [arrayOFProducts addObject:products];



        }
        sqlite3_close(productsDB);

    }


}

- (IBAction)btnDeleteProduct:(id)sender {
}

- (IBAction)btnViewProduct:(id)sender {
}

@end

回答1:

Your syntax to set a property is wrong, it should be

 products.nameProd = self.txtNameFeild.text;

which the compiler translates to the equivalent

[products setNameProd:self.txtNameFeild.text];

And arrayOFProducts should be declared as NSMutableArray if you want to add objects to it.

(Note that you can remove the @synthesize statements from your source code, the current Clang compiler synthesizes properties automatically.)

来源：https://stackoverflow.com/questions/18770693/getting-error-while-inserting-data-to-my-table-in-database-using-storyboard-i

标签

ios

objective-c

sqlite

storyboard