Image not resizing in SwiftUI TabView

This was the same in UIKit and the solution is to just use the right sizes for your images;

https://stackoverflow.com/a/29874619/3393964

If you can accept the system choosing the image size for you, you can actually add a custom Symbol Image Set to achieve this. You can use any vector icon as your base.

Export an existing symbol

To get a hold of the symbol template we need, you can open the SF Symbols app, select an icon and export it.

Edit in sketch

Open in Sketch (or another tool of your choice). Notice there's a distinct struture defined. We'll need to follow this structure. In the middle, there's a size named 'Regular-M', defining this one will suffice for our purposes. Open the 'Shape' group and place your Path elements in there.

You can remove the other sizes. Then, make the whole page exportable and export as SVG.

Import in Xcode

In your XCAsset file, add a new Symbol Image Set and drag-and-drop the newly created SVG file into there.

Now, you can simply refer to the image using the name you defined in your XCAsset file as you would expect. The image sizes automatically and will properly use accent colors:

TabView {
    Text("Hello, world 1").tabItem {
        Image("your.image.name")
        Text("title1")
    }
}