编辑UITextField时，调用setText将挂起一会儿

Question

输入时我正在格式化UITextField的文本。代码：

public void insertToDatabase(List<Account> listOfAccounts, Connection connection){

    PreparedStatement preparedStatement = null;
    try
    {
        preparedStatement = connection.prepareStatement( INSERT_ACCOUNT_QUERY );
    }
    catch( SQLException e1 )
    {
        // TODO Auto-generated catch block
        e1.printStackTrace();
    }
    try
    {

        for( Account account : listOfAccounts )
        {

            connection.setAutoCommit( false );


            preparedStatement.setString( 1, account.getFirstName( ) );
            preparedStatement.setString( 2, account.getLastName( ) );
            preparedStatement.setInt( 3, account.getHomeTellNumber( ) );
            preparedStatement.setInt( 4, account.getMobileTellNumber( ) );
            preparedStatement.setString( 5, account.getAddress( ) );
            preparedStatement.setString( 6, account.getCity( ) );
            preparedStatement.setString( 7, account.getState( ) );
            preparedStatement.setString( 8, account.getJob( ).getCode( ) );
            preparedStatement.setString( 9, account.getLocale( ).getCode( ) );

            preparedStatement.addBatch( );
        }


        preparedStatement.executeBatch( );

    }

    catch( SQLException e )
    {
        // TODO Auto-generated catch block
        e.printStackTrace( );
    }
    finally
    {
        try
        {
            preparedStatement.close( );
        }
        catch( SQLException e )
        {
            // TODO Auto-generated catch block
            e.printStackTrace( );
        }
    }
}

但是- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string { NSString *newString = nil; // format 'newString' here [textField setText:newString]; // move cursor return NO; } 将在主线程中挂起一段时间。文字更少，时间更多。

因此，我尝试了以下代码，setText:之前的resignFirstResponder：

setText:

它解决了挂起问题。

但是为什么会挂起。还有什么更好的解决方案。

Answer 1

newText是什么？您是说newString（您定义为nil）。请注意，UITextField的{​​{1}}不是text。