Xcode · Swift · iOS · macOS
Fix Xcode errors, Swift bugs & iOS problems, fast.
Step-by-step fixes for build errors, code signing, SwiftUI, App Store Connect and the bugs that come with every new iOS and macOS release.
Browse by topic
For developers
Xcode Errors
Build failures, code signing and provisioning, simulator problems, archive and upload errors.
For developers
Swift & SwiftUI
Swift and SwiftUI explained with working code: concurrency, data flow, navigation, compiler errors.
For developers
App Store & TestFlight
App Store Connect, TestFlight builds, App Review rejections and StoreKit issues.
For iPhone & iPad
iOS Fixes
Battery drain, Wi-Fi, Bluetooth, storage and app problems after iOS updates.
For Mac
macOS Fixes
macOS update problems, Finder, external drives, storage and apps that won’t open.
What’s new
Developer Updates
New Xcode, SDK and OS releases: what changed, known issues and what to update.
Latest guides
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How to Make an Attributed String in Swift (Styled Unit Suffix)
Build an NSAttributedString in Swift, append a differently styled unit like “g” to a changing number, and show it in a UILabel…
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Fix: Cannot Append to an NSDictionary in Swift (Use Dictionary)
NSDictionary has no append method and is immutable. Switch to a Swift Dictionary, add keys with subscript syntax, and bridge back when…
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How to Change the Navigation Bar Color in Swift (UIKit and SwiftUI)
Set the navigation bar background, title and button colors in UIKit and SwiftUI, and avoid the deprecated barTintColor API that no longer…
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How to Generate a Random Number in Swift (Modern API)
Use Int.random(in:), Double.random(in:) and randomElement() in Swift, seed a generator for repeatable results, and drop arc4random without modulo bias.
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Fix: Cannot Subscript String with an Int in Swift
Learn why Swift strings don’t support integer subscripting and get ready-to-use extensions for safe character access by index.
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How to Change the Background Color of a SwiftUI View
Set a SwiftUI view background color that actually fills the screen, handle safe areas, and style TabView and navigation bars without white…
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Fix: AppIcon “did not have any applicable content” in Xcode
Xcode’s actool rejects your icon set because the pixel sizes don’t match the slots. Fix the AppIcon catalog, generate every size, and…
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Fix: Wrong Screen Width and Height in iOS (Use the Right Object)
Stop reading view.frame for screen size. Get the real screen, window and scene dimensions in UIKit and SwiftUI, including Split View and…
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Fix: The sandbox is not in sync with the Podfile.lock in Xcode
Why Xcode says the sandbox is not in sync with the Podfile.lock, and how to fix it: resync with pod install, repair…
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Fix: iOS Simulator Deployment Target Warning in CocoaPods
Stop the CocoaPods warning about an iOS Simulator deployment target that is too low by setting IPHONEOS_DEPLOYMENT_TARGET in your Podfile and rebuilding.
Built from real problems
Every guide starts from an actual error message, release note or issue developers and users are hitting right now.
Fix first, theory second
A quick answer at the top, then the fixes in order of what’s most likely to work, with code you can copy.
Sources you can check
We link Apple’s release notes and the original discussions, and update guides when new versions change the answer.