In Xcode 9 and Swift 4:

Print exception stack to know the reason of the exception:

  1. Go to show break point navigator.
  2. Add (+) Add Exception Breakpoint.

  3. Select the new breakpoint, Control-Click, Edit Breakpoint.

  4. Add Action and Enter: po $arg1

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转载于:https://www.cnblogs.com/rexzhao/p/10087877.html

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