Cordova插件目标C，FMDatabase tableExists参数运行错误

如何解决Cordova插件目标C，FMDatabase tableExists参数运行错误

我有一个用于推送通知的客观C SDK，我正在尝试构建该sdk的框架，该框架可以作为插件添加到cordova应用程序中。有时，sdk会创建一个数据库并使用代码对其进行初始化：

///////////////////////////////////////////////////////////////////////////////
- (void)createDBIfNeeded
{
    NSArray *libraryDirectories = NSSearchPathForDirectoriesInDomains(NSLibraryDirectory,NSUserDomainMask,YES);
    NSString *libraryDirectory = libraryDirectories[0];
    NSString *dbPath = [libraryDirectory stringByAppendingPathComponent:DB_NAME];
    _db = [FMDatabase databaseWithPath:dbPath];
    [_db setShouldCacheStatements:YES];
    
    if ([_db open] == NO) {
        WLLOG(@"Failed to open database");
    }
}

///////////////////////////////////////////////////////////////////////////////
- (void)initDBIfNeeded
{
    if ([_db tableExists:@"events"] == YES && [_db tableExists:@"netstats"] == YES) {
        if ([_db columnExists:@"priority" inTableWithName:@"events"] == NO) {
            [_db executeUpdate:@"ALTER TABLE events ADD COLUMN priority INTEGER"];
            WL_FMDBLogError
        }
        
        [_db executeUpdate:@"VACUUM"];
        WL_FMDBLogError
        
        return;
    }
    
    if ([_db tableExists:@"events"] == NO) {
        [_db executeUpdate:@"CREATE TABLE events (_id INTEGER PRIMARY KEY  AUTOINCREMENT  NOT NULL  UNIQUE,type VARCHAR(255),time VARCHAR(255),data BLOB,priority INTEGER)"];
        WL_FMDBLogError
    } else if ([_db columnExists:@"priority" inTableWithName:@"events"] == NO) {
        [_db executeUpdate:@"ALTER TABLE events ADD COLUMN priority INTEGER"];
        WL_FMDBLogError
    }
    
    if ([_db tableExists:@"netstats"] == NO) {
        [_db executeUpdate:@"CREATE TABLE netstats (_id INTEGER PRIMARY KEY  AUTOINCREMENT  NOT NULL  UNIQUE,wifi INTEGER,wwan INTEGER,overall INTEGER,wifistart_timestamp INTEGER,wifiend_timestamp INTEGER,wifi_totaltime INTEGER,wifi_dirty INTEGER,wwanstart_timestamp INTEGER,wwanend_timestamp INTEGER,wwan_totaltime INTEGER,wwan_dirty INTEGER)"];
        [_db executeUpdate:@"INSERT INTO netstats (_id,wifi,wwan,overall,wifi_totaltime,wifi_dirty,wwan_totaltime,wwan_dirty) VALUES (NULL,?,?)",@0,@0];
        WL_FMDBLogError
    }
    
    if ([_db tableExists:@"pois"] == NO) {
        [_db executeUpdate:@"CREATE TABLE pois (id INTEGER PRIMARY KEY NOT NULL UNIQUE,lat NUMERIC,lon NUMERIC,radius NUMERIC)"];
    }
    
    [_db makeFunctionNamed:@"DISTANCE" maximumArguments:4 withBlock:^(sqlite3_context *context,int argc,sqlite3_value **argv) {
        distanceFunc(context,argc,argv);
    }];
    
    /*
     * Enable custom settings for the database,to improve
     * both behaviour and performance.
     * http://sqlite.org/pragma.html
     */
    [_db executeUpdate:@"PRAGMA auto_vacuum = FULL"];
    WL_FMDBLogError
    [_db executeUpdate:@"PRAGMA synchronous = NORMAL"];
    WL_FMDBLogError
}

但是当第二行在第一行执行时，我得到了错误： 由于未捕获的异常'NSInvalidArgumentException'而终止应用程序，原因：'-[[FMDatabase tableExists：]：无法识别的选择器已发送到实例0x28295caa0'

有什么想法吗？