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App Performance Optimization Session Q&A Notes (Oct 30, 2025)

Would it be beneficial to wrap Toolbar buttons in this GlassEffectContainer? Or is Toolbar optimized by default?

Controls in a SwiftUI toolbar will be correctly handled for you behind the scenes! If you're placing the controls yourself using other layout primitives, or something like safeAreaBar though, that's when adding a GlassEffectContainer becomes important!

Would the code from this session be available online? and would the videos still be available to watch later?

Hello! The code from this session will not be made available later, since it's only being used to illustrate how to use Instruments to optimize your SwiftUI app. Today's sessions are being recorded and will be available in the future.

stinger

FoundationModels code-along session Q&A (Sep 25, 2025)

Let me just say this format is AMAZINGLY well done, you guys. Is there a schedule somewhere of other "Code Along"s?

Thank you John, much appreciated! This is the only code along so far, but stay tuned to the Meet with Apple schedule for more events: https://developer.apple.com/events/view/upcoming-events

Will the recorded session be provided?

Great question! Yes, the code along will be available on-demand sometime after the event concludes. The code along will be made available on the Apple developer website and Youtube.

stinger

enum APIError: Error, LocalizedError {
    case unknown, apiError(reason: String), parserError(reason: String)

    var errorDescription: String? {
        switch self {
        case .unknown:
            return "Unknown error"
        case .apiError(let reason), .parserError(let reason):
            return reason
        }

stinger

//
//  ContentView.swift
//  Shared
//
//  Created by Costantino Pistagna on 25/03/21.
//

import SwiftUI

struct ContentView: View {

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func validate<T: Codable>(_ validator: @escaping (T) -> Bool) -> (T) -> Bool {
  return { input in
    return validator(input)
  }
}

enum StringValidator: CustomStringConvertible {
    case isNotEmpty
    case lengthIn(ClosedRange<Int>)
    

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function prompt_char {
	if [ $UID -eq 0 ]; then echo "#"; else echo $; fi
}

PROMPT='%(!.%{$fg_bold[red]%}.%{$fg_bold[cyan]%}%n@)%m:%{$fg_bold[green]%}%(!.%~.%1~)%{$fg_bold[yellow]%} $(git_prompt_info)%{$fg_bold[cyan]%}$(prompt_char)%{$reset_color%} '

ZSH_THEME_GIT_PROMPT_PREFIX="("
ZSH_THEME_GIT_PROMPT_SUFFIX=") "

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import Foundation
import Combine

enum APIError: Error, LocalizedError {
    case unknownError
    case unknownURL
    case unknownData
    case parserError(reason: String)
    case apiError(reason: String)

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import Foundation
import Combine

enum APIError: Error, LocalizedError {
    case unknown, apiError(reason: String), parserError(reason: String)

    var errorDescription: String? {
        switch self {
        case .unknown:
            return "Unknown error"

stinger

import Foundation
import Combine

enum APIError: Error, LocalizedError {
    case unknown, apiError(reason: String)

    var errorDescription: String? {
        switch self {
        case .unknown:
            return "Unknown error"

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extension View {
    func iff(_ condition: Bool, _ modifier: (Self) -> AnyView) -> AnyView {
        if condition {
            return modifier(self).eraseToAnyView()
        }
        return eraseToAnyView()
    }
    
    func some<Value>(_ optional: Value?, modifier: (Value, Self) -> AnyView) -> some View {
        guard let value = optional else {