How to use renderingMode with AsyncImage in SwiftUI

Question

I have a button that I want to be an image that can change colors as needed (loading async). To do this, I thought I could do something like this: I thought I could do something like this:

Button(action: { doAction }) {
  AsyncImage(url: URL(string: "test.com")) { image in
    image
      .resizable()
      .aspectRatio(contentMode: .fit)
      .renderingMode(.template)
  }
}

However, when I try to do this, I get a few errors:

"Cannot infer return type for closure with multiple statements"

"Closure containing control flow statement cannot be used with result builder 'TableRowBuilder' "

I'm not sure why these errors show up only when I add the "renderingMode" modifier. Everything works other than adding that. Any idea what I'm doing wrong?

EmilioPelaez · Accepted Answer · 2022-09-12 17:23:56Z

1

renderingMode is a modifier that's only available on Image. The aspectRatio modifier returns a View so you can't use Image-specific modifiers after it.

The fix is easy, just move aspectRatio one line up, right after resizable.

answered Sep 12, 2022 at 17:23

EmilioPelaez

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1 Comment

Olivia Brown Over a year ago

moving renderingMode to be first fixed it for me. Thank you for explaining

Nirav D · Accepted Answer · 2022-09-12 17:48:27Z

There are two problems in your code.

You can’t apply image-specific modifiers, like resizable(capInsets:resizingMode:), directly to an AsyncImage. Instead, apply them to the Image instance that your content closure gets when defining the view’s appearance. From Apple developer guide.

Button(action: { print("Hello") }) {
    AsyncImage(url: URL(string: imageURL)) { phase in
        if let image = phase.image {
            image
                .resizable()
                .aspectRatio(contentMode: .fit)
        } else if phase.error != nil {
            Color.red // Indicates an error.
        } else {
            Color.blue // Acts as a placeholder.
        }
    }
    .frame(width: 100, height: 100)
}

//OR

Button(action: { print("Hello") }) {
    AsyncImage(url: URL(string: imageURL)) { image in
        image
            .resizable()
            .renderingMode(.template)
            .aspectRatio(contentMode: .fit)
    } placeholder: {
        Color.clear
    }
    .frame(width: 100, height: 100) //Size of your button
}

renderingMode modifier needs to be called on Image and you are calling it after aspectRatio(contentMode:). Place it before and you are good to go.

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