In SwiftUI there are fixed frame and flexible frame modifiers.

Fixed frame Positions this view within an invisible frame with the specified size.

Use this method to specify a fixed size for a view’s width, height, or both. If you only specify one of the dimensions, the resulting view assumes this view’s sizing behavior in the other dimension.

VStack {
    Ellipse()
        .fill(Color.purple)
        .frame(width: 200, height: 100)
    Ellipse()
        .fill(Color.blue)
        .frame(height: 100)
}

Flexible frame frame(minWidth:idealWidth:maxWidth:minHeight:idealHeight:maxHeight:alignment:)

Read the documentation carefully

Always specify at least one size characteristic when calling this method. Pass nil or leave out a characteristic to indicate that the frame should adopt this view’s sizing behavior, constrained by the other non-nil arguments.

The size proposed…

Use NSTextField with maximumNumberOfLines

import AppKit
import SwiftUIstruct AttributedText: NSViewRepresentable {    let attributedString: NSAttributedString    init(_ attributedString: NSAttributedString) {
        self.attributedString = attributedString
    }    func makeNSView(context: Context) -> NSTextField {
        let textField = NSTextField()        textField.lineBreakMode = .byClipping
        textField.maximumNumberOfLines = 0
        textField.isBordered = false        return textField
    }    func updateNSView(_ nsView: NSTextField, context: Context) {
        nsView.attributedStringValue = attributedString
    }
}

TextField has problem with wrapping, we can use TextView

struct AttributedTextView: NSViewRepresentable {
    typealias NSViewType = NSScrollView    let attributedText: NSAttributedString?
    let isSelectable: Bool
    var insetSize: CGSize = .zero    func makeNSView(context: Context) -> NSViewType {
        let scrollView = NSTextView.scrollableTextView() let textView = scrollView.documentView…

NSTextView has this handy method to make scrollable NSTextView NSTextView.scrollableTextView(). The solution is to get to the responder outside enclosing NSScrollView, in my case it is the SwiftUI hosting view

…

Use @ViewBuilder to build dynamic content for our HUD. For blur effect, here I use NSVisualEffectView, but we can use .blur modifier also

struct HUD<Content>: View where Content: View {…

With Xcode 12, we can fire up Instrument to profile our app. Select SwiftUI template

There are many profiles in that template, I find SwiftUI and Time Profile very useful. Here’s the profile I run for my app PastePal

SwiftUI View Body

This shows how many instance of View with body invocation are there, both for SwiftUI views and our app views

Taking a look at SwiftUI profile, it shows that ClipboardCell is taking most of the time, here over 7 seconds

@propertyWrapper struct UserDefault<Value> { let key: String let defaultValue: Value let container: UserDefaults = .standard var wrappedValue: Value { get { return container.object(forKey: key) as? Value ?? defaultValue } set…

Use NSSharingService.sharingServices(forItems:) with an array of one empty string gives a list of sharing items. There we show image and title of each menu item

import SwiftUI import AppKit import…