Question

我正在做圣经申请，我有一个默认的圣经数据库英文DB.Sqlite，使用可以通过INAPP在应用程序内下载不同的语言数据库，我知道怎么做下载，但我的问题是当用户下载在希伯来语语言数据库中，app中有10个语言选项按钮。如果用户下载希伯来语数据库，希伯来语按钮将启用，他可以点击按钮并在桌面视图中查看，但是当他点击希伯来语按钮时应用程序数据库需要根据用户的需要进行切换，即如果用户点击了hindi数据库按钮，如果用户下载了hindi数据库，则需要在tableview中查看，用户点击需要切换该数据库的希伯来按钮用希伯来语，并在tableview中加载希伯来语数据库。我已经完成了加载英文数据库如何用下载的数据库重新加载这个？我显示英文数据库的代码是 in.h中

#import <sqlite3.h>

#define DbName @"BibleDB.sqlite"

@interface DbHandler : NSObject {

}

+(void)createEditableCopyOfDatabaseIfNeeded;
+(NSString *) dataFilePath:(NSString *)path;

// Malayalam Version
+(int)mNumberOfChaptersInBook:(NSString *)book;
+(int)mNumberOfVerseForChapter:(NSString *)chapter andBook:(NSString *)book;
+(NSMutableArray *)mVerseForChapter:(NSString *)chapterNo OfBook:(NSString *)book;
+(NSString *)mVerseForVerseNo:(NSString *)verseNo OfChapter:(NSString *)chapterNo OfBook:(NSString *)book;
//+(NSString *)mVerseForVerseNo:(NSString *)verseNo OfChapter:(NSString *)chapterNo OfBook:(NSString *)book FromDB:(sqlite3 *)database;


// English Version
//+(int)eNumberOfChaptersInBook:(NSString *)book;
+(NSMutableArray *)eVerseForChapter:(NSString *)chapterNo OfBook:(NSString *)book;
+(NSMutableArray *)verseForSearchTag:(NSString *)searchTag;

//Hindi version
+(NSMutableArray *)hVerseForChapter:(NSString *)chapterNo OfBook:(NSString *)book;
+(int)hNumberOfChaptersInBook:(NSString *)book;
//+(NSMutableArray *)hverseForSearchTag:(NSString *)searchTag;
//Bookmarks
+(void)createBookmark:(NSString *)text :(NSString *)book :(NSString *)chapter :(NSString *)verse;
+(NSMutableArray *)getBookmarks;
+(bool)deleteBookmark:(NSString *)book :(NSString *)chapter :(NSString *)verse;

@end

的.m

#pragma mark Englisg DB


+(NSMutableArray *)eVerseForChapter:(NSString *)chapterNo OfBook:(NSString *)book
{
    NSMutableArray * result = [[NSMutableArray alloc] init];
    sqlite3 *database;
    NSString *dbpath;
    dbpath = [DbHandler dataFilePath:DbName]; 
    if (sqlite3_open([dbpath UTF8String], &database) == SQLITE_OK)
    {
        NSString *selectSql = [NSString stringWithFormat:@"SELECT [text] FROM english where book = '%@' and chapterNo = '%@'",book,chapterNo];
        sqlite3_stmt *statement;
        if (sqlite3_prepare_v2(database, [selectSql cStringUsingEncoding:NSUTF8StringEncoding], -1, &statement, NULL) == SQLITE_OK)
        {
            while (sqlite3_step(statement) == SQLITE_ROW)
            {
                [result addObject:[NSString stringWithUTF8String:(char *)sqlite3_column_text(statement, 0)]] ;
            }
            sqlite3_finalize(statement);
        }
        else
        {
            NSLog(@"Sql Preparing Error");
        }
        sqlite3_close(database);
    }
    else
    {
        NSLog(@"Database not opening");
    }
    return result;


}


+(NSMutableArray *)verseForSearchTag:(NSString *)searchTag
{
    NSMutableArray * result = [[NSMutableArray alloc] init];
    sqlite3 *database;
    NSString *dbpath;
    dbpath = [DbHandler dataFilePath:DbName]; 
    if (sqlite3_open([dbpath UTF8String], &database) == SQLITE_OK)
    {
        NSString *selectSql = [NSString stringWithFormat:@"SELECT [text],book,chapterNo,verseNumber FROM english where [text] like '%%%@%%%' limit 0,500",searchTag];
        sqlite3_stmt *statement;
        if (sqlite3_prepare_v2(database, [selectSql cStringUsingEncoding:NSUTF8StringEncoding], -1, &statement, NULL) == SQLITE_OK)
        {
            while (sqlite3_step(statement) == SQLITE_ROW)
            {
                [result addObject:[[NSMutableDictionary alloc] init]] ;

                [[result lastObject] setObject:[NSString stringWithUTF8String:(char *)sqlite3_column_text(statement, 0)] forKey:@"text"];
                [[result lastObject] setObject:[NSString stringWithUTF8String:(char *)sqlite3_column_text(statement, 1)] forKey:@"book"];
                [[result lastObject] setObject:[NSString stringWithUTF8String:(char *)sqlite3_column_text(statement, 2)] forKey:@"chapter"];
                [[result lastObject] setObject:[NSString stringWithUTF8String:(char *)sqlite3_column_text(statement, 3)] forKey:@"verse"];
            }
            sqlite3_finalize(statement);
        }
        else
        {
            NSLog(@"Sql Preparing Error");
        }
        sqlite3_close(database);
    }
    else
    {
        NSLog(@"Database not opening");
    }
    return result;


}
+(int)hNumberOfChaptersInBook:(NSString *)book
{
    sqlite3 *database;
    NSString *dbpath;
    dbpath = [DbHandler dataFilePath:DbName]; 
    if (sqlite3_open([dbpath UTF8String], &database) == SQLITE_OK)
    {
        NSString *selectSql = [NSString stringWithFormat:@"SELECT count(*) FROM hindi where book = '%@'",book];
        sqlite3_stmt *statement;
        if (sqlite3_prepare_v2(database, [selectSql cStringUsingEncoding:NSUTF8StringEncoding], -1, &statement, NULL) == SQLITE_OK)
        {
            while (sqlite3_step(statement) == SQLITE_ROW)
            {       
                return [[NSString stringWithUTF8String:(char *)sqlite3_column_text(statement, 0)] intValue];
            }
        }
        else
        {
            NSLog(@"Sql Preparing Error");
        }
    }
    else
    {
        NSLog(@"Database not opening");
    }
    return 0;


}

#pragma mark DB Setup Functions

+(void)createEditableCopyOfDatabaseIfNeeded {
    // First, test for existence.
    BOOL success;
    NSFileManager *fileManager = [NSFileManager defaultManager];
    NSError *error;
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSString *writableDBPath = [documentsDirectory stringByAppendingPathComponent:DbName];
    success = [fileManager fileExistsAtPath:writableDBPath];
    if (success) {
        NSLog(@"Database file already exist, so returning...");
        return;
    }
    NSLog(@"CREATING A NEW COPY OF THE DATABASE...");
    // The writable database does not exist, so copy the default to the appropriate location.
    NSString *defaultDBPath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:DbName];
    //[fileManager removeItemAtPath:writableDBPath error:nil];
    success = [fileManager copyItemAtPath:defaultDBPath toPath:writableDBPath error:&error];
    if (!success) {
        //Some serious problem...
        NSAssert1(0, @"Failed to create writable database file with message '%@'.", [error localizedDescription]);
    }
}

+(NSString *) dataFilePath:(NSString *)path
{ 
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
    NSString *documentsDirectory = [paths objectAtIndex:0];
    return [documentsDirectory stringByAppendingPathComponent:path]; 
}

@end

这是我用于显示此db

的tableview代码

static NSString *CellIdentifier = @"Cell";

    readCell *cell = (readCell *)[tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        NSArray *nib = [[NSBundle mainBundle] loadNibNamed:@"readCell" owner:self options:nil]; 
        cell = [nib objectAtIndex:0]; 
        cell.malayalamVerse.hidden = YES;
        cell.malayalamVerse.backgroundColor = [UIColor clearColor];
       // self.table.tableFooterView = refreshFooterView;
        //self.table.tableFooterView.userInteractionEnabled = YES;

    }
if(tableView == table)
    {
        UIView *myBackView = [[UIView alloc] initWithFrame:cell.frame];
       // myBackView.backgroundColor = [UIColor colorWithRed:250.0 green:248.0 blue:192.0 alpha:1.0];
        [myBackView setBackgroundColor:[UIColor clearColor]];
        cell.selectedBackgroundView = myBackView;
        [myBackView release];


        cell.textLabel.highlightedTextColor = [UIColor colorWithRed:1 green:1 blue:0.75 alpha:1];
        table.backgroundColor = [UIColor clearColor];
        table.separatorColor = [UIColor clearColor];
        cell.chapterAndVerse.text = [NSString stringWithFormat:@"%@.%d ",delegate.selectedChapter, indexPath.row+1];

        cell.chapterAndVerse.backgroundColor= [UIColor whiteColor];
        cell.chapterAndVerse.textColor = [UIColor brownColor];
        cell.chapterAndVerse.font = [UIFont fontWithName:@"Georgia" size:14.0];
        cell.chapterAndVerse.frame=CGRectMake(33, 6, 30.0, 12.0);
        cell.textLabel.text =  [NSString stringWithFormat:@"            %@",[delegate.allSelectedVerseEnglish objectAtIndex:indexPath.row]];
        cell.textLabel.font = [UIFont fontWithName:@"Georgia" size:18];
        cell.textLabel.textColor = [UIColor darkGrayColor];
        cell.textLabel.lineBreakMode = UILineBreakModeWordWrap;
        cell.textLabel.numberOfLines = 0;
        cell.backgroundColor = [UIColor clearColor];

    }

请帮我这样做，如果有人对此有所了解请与我分享。非常感谢。

Answer 1

这个问题已经存在了一段时间，所以你可能已经解决了这个问题。

你已经发布了很多代码，但是如果我理解这个问题，那么需要发生的主要问题是在tableView：cellForRowAtIndexPath：方法中，应用程序根据选择的语言做了不同的事情。

两种方法： 数据库对象中的（1）（在代码中由delegate指向）对于所有语言都有一种方法，例如`allSelectedVerse：'。然后，在数据库对象方法中，对语言进行测试并返回相应的文本。或（2）在tableView：cellForRowAtIndexPath：方法中运行所选语言的测试，并相应地调用数据库对象上的不同方法。

无论哪种方式，您都需要一些存储所选语言的方法。这可以是数据库对象，也可以是用于跟踪设置或以多种不同方式跟踪的单例。

虽然（2）不太优雅，但需要的代码较少。假设使用NSString属性和将当前选择的语言存储在数据库对象中，假设每当用户更改语言时，您发送tableView reloadData方法，以下代码应该执行此操作。（所有这些假设我首先理解你的问题......）

- (UITableViewCell*) tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath;
{
    static NSString *CellIdentifier = @"Cell";

    readCell *cell = (readCell *)[tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil)
    {
       [self configureCellOnFirstCreation: cell]; // farm out configuration
    }

  if (tableView == table)
  {
     [self configureCell: cell]; // farm out cell configuration, so the content setting code is more prominent

     cell.chapterAndVerse.text = [NSString stringWithFormat:@"%@.%d ",delegate.selectedChapter, indexPath.row+1];

     if ([[delegate selectedLanguage] isEqualToString: @"Malayalam"])
     {
       cell.textLabel.text = [NSString stringWithFormat:@"            %@",[delegate.allSelectedVerseMalayalam objectAtIndex:indexPath.row]];           
     }
     else if ([[delegate selectedLanguage] isEqualToString: @"Hindi"])
     {
         cell.textLabel.text = [NSString stringWithFormat:@"            %@",[delegate.allSelectedVerseHindi objectAtIndex:indexPath.row]];
     }
     else // default to English is no matching string found
     {
         cell.textLabel.text = [NSString stringWithFormat:@"            %@",[delegate.allSelectedVerseEnglish objectAtIndex:indexPath.row]];
     }
   }

  else
  {
      // handle the other case, e.g. when we're doing search

  }
}

尾注如果您可以在问题中发布更少的代码，我想您可能会获得更多更快的答案。在上面，我已经将配置转换为其他方法，因此重要的代码流程更加突出。

如何下载数据库文件并在应用程序中读取？

1 个答案: