Here's my code:

(from SQLiteDB.h)

#import <sqlite3.h>


@interface SQLiteDB : NSObject {

    NSString *dbPath;
    int databaseKey;
    sqlite3 *db;
}

//@property (nonatomic, copy) NSString *db;
@property (nonatomic, copy) NSString *dbPath;
@property (nonatomic) 开发者_如何学Pythonsqlite3 *db;
@property (nonatomic) int databaseKey;
@end

=============== (from SQLiteDB.m)

#import "SQLiteDB.h"


@implementation SQLiteDB
@synthesize db, dbPath, databaseKey;
@end

=============== (from SampleAppDelegate.m)

#import "ReaderSampleAppDelegate.h"
#import "ReaderSampleViewController.h"

@implementation ReaderSampleAppDelegate

@synthesize window;
@synthesize viewController;


#pragma mark -
#pragma mark Application lifecycle


- (void)applicationDidFinishLaunching:(UIApplication *)application
{
    //  create the d/b or get the connection value
    SQLiteDB *dbInstance = [[SQLiteDB alloc] init];  //  Error here  <---------
}

==================

Error is: SQLiteDB undeclared.

I thought I did declare it in SQLiteDB.h? How do I fix this?

use

#import "SQLiteDB.h" 

in SampleAppDelegate.m

In SampleAppDelegate.m include the following line:

#import "SQLiteDB.h"

You need:

#import "SQLiteDB.h" in SampleAppDelegate.m or .h

You need to #import SQLiteDB.h into SampleAppDelegate.m

You probably need to #import "SQLiteDB.h" in SampleAppDelegate.m