Observe objects in SwiftUI Views which may be nil

Last update: Jul 20, 2022

Overview

ObservedOptionalObject

Rationale

SwiftUIs @ObservedObject requires that the observed object actually exists. In some cases it's convenient to observe an object which might be nil. In this case, @ObservedOptionalObject can be used.

struct SomeView: View {
    // Instead of
    @ObservedObject var anObject: Model? // Won't work
    
    // use
    @ObservedOptionalObject var anObject: Model?
    
    var body: some View {
        HStack {
            Text("Name")
            if let name = anObject?.name {
                Text(name)
            }
        }
    }
}

Please note, that @ObservedOptionalObject is only useful if your contains content that should be displayed, even when the object is nil. Otherwise the view should be contained within an if let statement: if let obj = obj { SomeView(anObject: obj) }

Installation

This package is available via SwiftPM

dependencies: [
    .package(url: "https://github.com/fourplusone/observed-optional-object.git", 
        .upToNextMinor(from: "0.1.0")
    )
]

License

This project is licensed under the MIT License.

You might also like...

FancyGradient is a UIView subclass which let's you animate gradients in your iOS app. It is purely written in Swift.

FancyGradient is a UIView subclass which let's you animate gradients in your iOS app. It is purely written in Swift. Quickstart Static gradient let fa

11 Aug 25, 2022

Unit-Converter-SwiftUI - A simple Unit Converter iOS app built in the process of learning SwiftUI

SwiftUI-Unit-Converter A simple Unit Converter iOS app built in the process of l

2 Jul 13, 2022

Recreating a fully functional version of iOS 4 in SwiftUI.

Updates: Version 1.0 is currently available 🎉 While I work on fixing an issue in Xcode 12.5+ with LazyVGrid, I recommend you build using Xcode 12.4 a

2.9k Jan 1, 2023

I needed to detect idle mode on a SwiftUI app for a kiosk, so I did it.

Inactivity I needed to detect idle mode on a SwiftUI app for a kiosk, so I did it. Usage Important: You must set the Principal class of your app to In

16 Dec 19, 2022

SnippetsLibrary - Code snippets library for SwiftUI Devs.

SnippetsLibrary is a helpful tool for SwiftUI developers to help with their daily coding life. SnippetsLibrary contains all the needed code snippets for you to view, edit, or add more and more. This will make your daily work easier and faster.

41 Jan 2, 2023

🟣 Verge is a very tunable state-management engine on iOS App (UIKit / SwiftUI) and built-in ORM.

Verge is giving the power of state-management in muukii/Brightroom v2 development! Verge.swift 📍 An effective state management architecture for iOS -

478 Dec 29, 2022

Pigeon is a SwiftUI and UIKit library that relies on Combine to deal with asynchronous data.

Pigeon 🐦 Introduction Pigeon is a SwiftUI and UIKit library that relies on Combine to deal with asynchronous data. It is heavily inspired by React Qu

369 Dec 30, 2022

Safe and fast access to SwiftUI PreviewDevice

SafePreviewDevice Motivation At WWDC 2019, Apple announced SwiftUI a new library for building UI in a simple and fast way. Xcode’s SwiftUI preview let

11 Jun 28, 2022

Customize and resize sheets in SwiftUI with SheeKit. Utilise the power of `UISheetPresentationController` and other UIKit features.

SheeKit Customize and resize sheets in SwiftUI with SheeKit. Utilise the power of UISheetPresentationController and other UIKit features. Overview She

67 Dec 31, 2022

Comments

iOS 13

There does not appear to be any reason for why the class should be @available only on iOS 14+.

Please consider relaxing the @available rule to what is actually required by the implementation & in-line with 74aa40a398688b90ee7724797861185e5a696aca :–)
wontfix

opened by lhunath 4