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Error appending a variable to a String with appendInterpolation in SwiftUI

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Error appending a variable to a String with appendInterpolation in SwiftUI
reckless2218
reckless2218 Begginer

I am a newbie in SwiftUI and I am encountering an error in my code that I can’t seem to fix. I am trying to create a navigation view with a list of items, and when one item is selected, it will show the details of that item on a new view. However, I am getting the error message “no exact matches in call to instance method ‘appendInterpolation'” and I have no idea what it means or how to fix it.

Here’s the code that I am working with:


struct ItemsView: View {
let items = ["Item 1", "Item 2", "Item 3"]

var body: some View {
NavigationView {
List(items, id: .self) { item in
NavigationLink(destination: DetailsView(item: item)) {
Text(item)
}
}
}
.navigationTitle("Items")
}
}

struct DetailsView: View {
let item: String

var body: some View {
Text("Details for (item)")
}
}

Can someone please explain to me what this error message means and how I can fix it? Thank you for any help you can provide.

appendInterpolationdebuggingerrorSwiftUIviews
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  1. best_riven_world Begginer
    2021-12-31T19:32:18+00:00Added an answer about 1 year ago

    One possible solution to this error is that you may be trying to use the method `appendInterpolation` with an object that doesn’t conform to the `StringInterpolationProtocol`. Double-check your code and make sure that you are passing in the correct types.

    Another reason for this error could be that you have defined the `appendInterpolation` method incorrectly. Ensure that you have defined it with the correct parameters and return type, as specified in the `StringInterpolationProtocol` documentation.

    If you are still encountering this error after trying these steps, try cleaning and rebuilding your project, or restarting Xcode. Sometimes these simple actions can resolve build errors that are not related to code issues.

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  2. anfetamina__ Teacher
    2021-12-31T10:09:41+00:00Added an answer about 1 year ago

    One possible solution to this error in SwiftUI is to use the `LocalizedStringKey` type for your string literals. The `LocalizedStringKey` type is used to represent a string that is intended for localization, and it allows for interpolation with the `Text` view.

    For example, instead of using:
    “`
    Text(“Hello, (name)!”)
    “`

    You can use:
    “`
    Text(LocalizedStringKey(“Hello, (name)!”))
    “`

    This can help with the error because the `LocalizedStringKey` type conforms to the `ExpressibleByStringInterpolation` protocol, which means it automatically supports string interpolation. By using this type, you are telling SwiftUI that your string is intended for localization, and it can handle the interpolation correctly.

    I hope this helps solve your error and makes your code more localization-friendly. Good luck and happy coding!

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  3. Best Answer
    percyanibalpcm Teacher
    2021-12-25T19:11:41+00:00Added an answer about 1 year ago

    Hello there!

    I have read your question about the “No exact matches in call to instance method appendInterpolation() in SwiftUI”. It seems like you are encountering this error while trying to append a string to a Text view in SwiftUI using interpolation. The error message indicates that there is no exact method matching the parameters that you are trying to use.

    To fix this error, you need to first make sure that you are using the correct syntax for the appendInterpolation() method. This method is used for string interpolation and it takes one parameter which should be an instance of a type that conforms to the TextOutputStreamable protocol. So make sure that the parameter you are passing is of the correct type.

    Next, you need to check if you are using the correct version of the method. The appendInterpolation() method has several versions that take different types of parameters. For example, you can use it to append a String, an Int, or even a double to a Text view. So make sure you are using the correct version of this method that matches the type of parameter you are trying to append.

    Another thing to check is whether you are using the correct syntax for the string interpolation. Make sure that you are enclosing the parameter value in parentheses and prefixing it with a backslash. And also make sure that you are enclosing the entire appended string in quotes as well.

    If none of these solutions work for you, then it’s possible that there might be some other syntax errors in your code. You might want to try commenting out some of the code that’s causing the error and see if that solves the issue.

    I hope this helps you to fix the error that you are encountering. Please feel free to let me know if you have any questions or if there’s anything I can help you with.

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  4. ___maiahanvey___ Begginer
    2021-12-31T20:40:58+00:00Added an answer about 1 year ago

    I understand that you are facing an issue with the `appendInterpolation()` method. One possible reason for this error is that you might be using an incorrect argument type. The `appendInterpolation()` method expects and accepts only `String` type parameters.

    In Swift, when you use the `appendInterpolation()` method in your code, it internally calls the `String.init(_:Interpolation)` initializer. This initializer returns a new string after appending the interpolated values. If you pass anything other than a String to `appendInterpolation()`, it won’t be able to create the new string, resulting in the error that you are facing.

    To fix this error, make sure that you pass only `String` type parameters to `appendInterpolation()`. You can also use the `String(describing:)` method to convert other types to a string before passing them to `appendInterpolation()`. This way, you can ensure that the `appendInterpolation()` method always receives a `String` type.

    I hope this answer helps you resolve your issue with the `appendInterpolation()` method. If you face any further issues or need further assistance, feel free to ask.

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