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Xcode 9 tips

  • press the Cmd+Ctrl+E buttons to rename

  • Cmd+Ctrl+left mouse button or Cmd+Ctrl+J or Cmd+Right mouse click to jump to definition

  • .xcodesamplecode.plist is what triggers Xcode to render the Markdown as seen in their sample. This file can be found under the .xcodeproj (within Package Contents). The content of this file is as the below. Reference:https://dev.to/danielinoa_/rendering-markdown-in-xcode-9

 <?xml version="1.0" encoding="UTF-8"?>
  <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
  <plist version="1.0">
  <array/>
  </plist>

  • The Main Thread Checker is a standalone tool for Swift and C languages that detects invalid usage of AppKit, UIKit, and other APIs on a background thread.

  • Select the segue object in Interface Builder, you can select the Preview & Commit Segues checkbox under Peek & Pop section.