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Top 5 SwiftUI Errors & How to Tackle Them Like a Pro 🤦🏿‍♂️🚀

Updated: Mar 25, 2023

Hey there, SwiftUI developers! 🌟 Today, we’re taking a lighthearted look at the top 5 SwiftUI errors that trip us up while coding. Don’t worry, though — we’ve got you covered with solutions to turn those frowns upside down! 😂 Let’s dive in and tackle these pesky errors like a pro! 🏄🏿‍♀️



1. Forgetting the ‘self’ in closures 🤳🏿

Ah, the infamous ‘self’ error! We’ve all been there, forgetting that one keyword that makes all the difference. Here’s the error message:

Reference to property 'someProperty' in closure requires explicit 'self.' to make capture semantics explicit

Solution: Just add self. before the property! 👌🏿

Button(action: {
    self.someProperty = true
}) {
    Text("Tap me!")
}

Now your code is more self-aware! 😎

2. Preview crashing, the never-ending story 🎬

Who doesn’t love a good SwiftUI preview crash? 🤯 The dreaded error message:

Cannot preview in this file – MyPreviews.previewProvider crashed

Solution: Don’t panic! 🚨 Just try these steps:

  1. Clean your build folder (⇧⌘K).

  2. Restart Xcode.

  3. Build your project (⌘B).

It’s like turning your preview off and on again! 😅

3. Forgetting to return a view from a function 🏃🏿‍♂️

Here’s a classic SwiftUI error when you forget to return a view from a function:

Function declares an opaque return type, but has no return statements in its body from which to infer an underlying type

Solution: Remember to return a view! 🔄

func myFancyView() -> some View {
    VStack {
        Text("I'm so fancy!")
    }
}

Your code is now ready for the runway! 💃🏿

4. Type mismatch in body property 🚫

Sometimes we make a boo-boo and our body property doesn't return a View. The error message:

Type '_' does not conform to protocol 'View'

Solution: Use Group or AnyView to return different views! 🎁

var body: some View {
    Group {
        if someCondition {
            Text("Hello, SwiftUI!")
        } else {
            Text("Goodbye, SwiftUI!")
        }
    }
}

Problem solved — your code is now more flexible than a gymnast! 🤸🏿‍♀️

5. Unresolved identifier in previews 🔍

When working on separate files, you might get the error:

Use of unresolved identifier 'MyView_Previews'

Solution: Import the correct module! 🛃

import SwiftUI
import MyModule

struct MyView_Previews: PreviewProvider {
    static var previews: some View {
        MyView()
    }
}

That’s it — your previews are now good to go! 🚀

Wrapping Up: No More Tears 😂

Congratulations! 🎉 You’ve just learned how to tackle the top


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