Meet Multicast Delegate — Remind The Notification Center The Notification Center is a type of the observer pattern, similar to the delegation pattern which informs that an operation has been completed. …

Using tryMap, catch, replaceError operations and Fail Publisher — Error handling provides us catching an error during an application lifecycle in the mobile development. When we develop the app by written imperatively in Swift such as try-catch, Result failure case are significant to catch any error. In Combine, differently, it pushes us to handle catching an error at the…

Get an Idea About Combine with UIKit — Just is a struct that gets a generic value in its initialization for using asynchronous programming namely Combine. It only emits its value once to subscriber and it is finished so it is known as Publisher, too. Let’s define a basic property using Just and after we will see that…

Share Xcode snippets with your team — Argument Parser is a new package introduced by Apple. It makes writing a command line tool easier to automate common tasks. Argument Parser has three property wrappers: Argument, Flag, and Option. Argument It is a value set in our argument variable when running the script. For example, we will run swift…

Safe provides bounds-checking for existing collections in Swift. It prevents Index out of range error when we deal with for instance accessing collection’s element to show for every table view or collection view. It unwraps the value of collection if it is not inside it, gives a nil value. Therefore…

Meet XCTemplate — Sometimes almost every task is often similar to another one from some aspects. There is always a boilerplate code for those tasks and there are common part of each other. For example, if we want to list something, we always prefer UITableView or we want to list and configure something…

Improve performance for older iPhones — Both color blending and off-screen rendering are an unheeded topic for iOS development owing to the power of iPhones. On the other hand, it is not only a hot topic for iOS interviews, but also if you are working with lots of high-resolution images in a list for an old…

Working with Data Locally — Caching provides the apps more responsive and useful for example, when it is offline mode and prevents data loading over and over again. Thanks to caching, we can easily use app features as we want. In iOS, the device can delete smartly all caches when it is running on low…

Inspect an UIViewController without running the project — Preview is a cool feature that comes with SwiftUI to show views in xCode without any running operation so, what if UIKit? For example, If you want to do same thing for UIKit to minimize service request count when drawing, coding some complex UI, you are bored about endless Xcode…