Hey there, fellow Xcode newbie! I’ve been exactly where you are—staring at those confusing error messages and wondering why the app works fine on the simulator but dies on a real iPhone. Let’s break this down step by step—this is totally fixable, I promise.

1. 先搞定签名链警告（这是闪退的核心根源） #

那个 Warning: unable to build chain to self-signed root for signer 警告 is the main culprit here. Your iPhone doesn’t trust your developer signing certificate, so it kills the app before it even launches. Here’s how to fix it:

• Open Xcode, hit Cmd + , to open Preferences, then switch to the Accounts tab
• Select your Apple ID, click Manage Certificates
• Look for iOS Development certificates: if any have a yellow exclamation mark or look duplicate/weird, delete them
• Click the + button at the bottom left, choose iOS Development to generate a fresh certificate
• Go back to your project’s Signing & Capabilities tab, make sure Automatically manage signing is checked, and your correct Team is selected
• Critical step! Grab your iPhone: open「Settings」→「General」→「VPN & Device Management」, find your developer account’s certificate, tap「Trust」, confirm, then restart your device

2. 清理缓存 & 重新构建 #

Old build cache often messes up the signing process. Let’s do a clean sweep:

• Close Xcode, find the DerivedData folder for your project (you can locate its path via Xcode’s File → Project Settings), then delete the entire folder
• Reopen your project, press Cmd + Shift + K to clean the build folder
• Reconnect your iPhone, select it as the run target, then hit Cmd + R to rebuild and run

3. 排查 dyld 启动报错 #

If you still see errors like dyld__abort_with_payloadordyld_dyld_start, it’s likely an architecture or dependency issue:

• Check your project’s Build Settings → Architectures, make sure it’s set to Standard Architectures (usually arm64—don’t manually add extra architectures)
• If you’re using CocoaPods for third-party libraries, run these commands to reinstall dependencies properly:

  pod deintegrate
  pod install
  

• Get more details from crash logs: Open Xcode’s Organizer (via Window → Organizer), select your device, find the crash record for your app. The log will tell you exactly which library or code block is causing the launch failure

内容的提问来源于stack exchange，提问作者Pankaj Kumar