A Custom Combine Publisher can add missing functionalities to UIKit elements you use every day. A lot of boilerplate code can be removed and implementations can be simplified. A simple example is responding to UIControl events. The standard library comes with a few great extensions to, for example, decode JSON easily and assign values to key …
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Using Xcode Previews with existing UIKit views without using SwiftUI
Xcode Previews have been added in Xcode 11 and allow you to quickly preview the current state of your view. Although you might think that you need to use SwiftUI to make use of this great new feature, it’s not true! Whether you’re working with a custom UIView or with a custom UIViewController, they both …
Using NSBatchDeleteRequest to delete batches in Core Data
An NSBatchDeleteRequest can be used to efficiently delete a batch of entries from a Core Data SQLite persistent store. It runs faster than deleting Core Data entities yourself on a managed object context as they operate at the SQL level in the persistent store itself. Its usage, however, is a bit less simple compared to the …
Weak self and unowned self explained in Swift
Weak self and unowned self in Swift for many of us are hard to understand. Although Automatic Reference Counting (ARC) solved a lot for us already, we still need to manage references when we’re not working with value types. When writing Swift code we often run into situation while writing things like closures. Those situations …
Typealias usage in Swift
A typealias in Swift is literally an alias for an existing type. Simple, isn’t it? They can be useful in making your code a bit more readable. By using them in a smart way they can be really useful in your codebase. Declaring a typealias A typealias can be declared in Swift using the typealias …
Quickly run your latest tests again
^+⌥+⌘+G This shortcut enables you to re-run the last run tests again.
@unknown default usage with enums in Swift
@unknown default has been introduced in Swift 5 with SE-0192. It’s a new addition to the way we can work with Swift enums and helps us to prepare for future changes. After updating your project to Swift 5 you might end up with a new warning in Xcode 10.2: Switch covers known cases, but ‘UNAuthorizationStatus’ may …
Swift 5.0: How to migrate your project and frameworks
Swift 5.0 has been released in March 2019 and is the first ABI stable Swift release. Although a lot of resources cover the new things in Swift 5.0, they do not often offer you information on what you need to do to update your project to Swift 5.0. In this post, I’ll go over the …
WWDC First timer tips: How to get the most out of it
WWDC first timer tips help you to get the most out of Apple’s World Wide Developer Conference. This conference takes place every year around the first weeks of June. It’s the event at which Apple announces the new iOS version, Xcode updates, and latest API changes in depth. It’s a chance to experience the Keynote presentation …
Blog about Swift: Tips and ideas to start your own
How to start your own Swift blog? It’s a question I get asked more and more. I’ve given some tips already in my interview with hackingwithswift.com, but it’s not as good as writing a dedicated post to help you start up your own blog. May 2nd, 2015 I wrote my very first blog post. At …