Realm Object as a Singleton: Understanding the Issue and Correct Approach Introduction Realm is a popular offline SQLite database for iOS and macOS apps. It provides an easy-to-use API to store and retrieve data, making it an attractive choice for many developers. However, when using Realm Objects as singletons, several issues can arise, including problems with transactions and thread safety. In this article, we will explore the use of Realm Object as a singleton in iOS and macOS apps, discuss potential errors, and provide guidelines on how to correctly implement singletons using Realm Objects.

Introduction to Splitting Amounts in SQL As a technical blogger, I’ve encountered numerous scenarios where splitting an amount into different columns has been necessary. In this article, we’ll delve into the world of SQL and explore how to achieve this task efficiently. Understanding the Problem Let’s start by examining the given problem. We have a table with an id column and an amount column. The amount column contains decimal values that need to be split into two separate columns: euro (the whole number part) and cent (the fractional part).

Gaps and Islands in SQL and LINQ: A Deep Dive When working with data, it’s common to encounter situations where there are “gaps” or “islands” of missing data. This can happen when dealing with time series data, sensor readings, or any other type of data that has a natural ordering. In this blog post, we’ll explore how to solve the classic problem of selecting records where only one parameter changes using SQL and LINQ.

Changing Recorded Video Orientation ===================================================== In this article, we’ll explore the process of changing the orientation of a recorded video from landscape mode to portrait mode permanently. We’ll dive into the world of iOS and macOS video handling, including the AVURLAsset class and its properties. Background When you record a video on an iOS or macOS device, it’s stored in the device’s document directory as a .mov file. By default, this file is in landscape mode (width > height).

Python Pandas: Self-Join for Running Cumulative Total, with Conditions In this blog post, we will explore how to perform a self-join in Python using the popular Pandas library. Specifically, we’ll tackle the task of running cumulative totals and calculating mean ID ages on specific dates. Introduction to Pandas and Self-Joining Pandas is an excellent data analysis library for Python that provides efficient data structures and operations for handling structured data. The self-join operation allows us to join a dataset with itself based on a common column, enabling complex queries and aggregations.

Using COUNT with Aggregate in Postgres Introduction PostgreSQL is a powerful and feature-rich database management system. One of its strengths lies in its ability to perform complex queries, including aggregations. In this article, we’ll explore how to use the COUNT function with aggregate operations in PostgreSQL. Understanding COUNT The COUNT function returns the number of rows that match a specific condition. However, when used alone, it only provides a simple count of records without any additional context.

Creating a Custom UITableViewCell for “State Touched” When building user interfaces for tables in iOS applications, there are several ways to achieve specific visual states for cells. One common requirement is to add an image to a table view cell when it is being touched, and remove the image when the touch ends. In this article, we will explore how to create a custom UITableViewCell that meets this requirement using the touchesBegan and touchesEnded methods.

Creating a New Column with Categorical Values Based on Date Dictionary When working with dates in pandas DataFrames or Series, it’s often necessary to create categorical values based on specific rules or conditions. In this article, we’ll explore how to achieve this using a date dictionary. Understanding the Problem The problem presented in the Stack Overflow question is as follows: We have a DataFrame with a datetime column and want to add a new column indicating whether each entry is a public holiday or not.

Introduction to Libmms Functions for Streaming MMS Audio Libmms is a C library that provides an interface to the Microsoft Media Server (MMS) protocol. It allows developers to stream audio and video content from an MMS server to various platforms, including iOS devices using FFmpeg. In this article, we will explore how to use Libmms functions to stream mms audio. Prerequisites To use Libmms with FFmpeg, you need to have both libraries installed on your system.

Defining Multiple UI Components in iOS Using a Scroll View Introduction In iOS development, creating complex user interfaces (UIs) can be challenging. When dealing with multiple UI components, such as questions with different types and validation requirements, it’s essential to choose the right approach to ensure a seamless user experience. In this article, we’ll explore the best way to define multiple UI components in a scroll view, considering various design perspectives and iOS development techniques.