如何在调试时打印Swift结构的自定义说明，而没有其他内容？

Question

Say I have a struct like this one:

struct MyStruct: CustomStringConvertible {
    let myInt: Int
    let myString: String

    var description: String {
        return "my int is \(myInt),\nand my string is \"\(myString)\""
    }
}

Printing a description from the code works fine.

let myStruct = MyStruct(myInt: 3, myString: "hello")
print(myStruct)

This results in

my int is 3,
and my string is "hello"

Problems arise when I want to print myStruct 's description from the debugger. po myStruct results in

▿ my int is 3,
and my string is "hello"
  - myInt : 3
  - myString : "hello"

Explicitly printing out its description doesn't help either, as po myStruct.description results in

"my int is 3,\nand my string is \"hello\""

I thought it might have to do with CustomDebugStringConvertible , so I added this code:

extension MyStruct: CustomDebugStringConvertible {
    var debugDescription: String {
        return description
    }
}

Unfortunately, this doesn't change any of the outcomes at all.

Is there a way to just have

my int is 3,
and my string is "hello"

printed from the command line while debugging?

Answer 1

(lldb) expression print(myStruct)
my int is 3,
and my string is "hello"

you can defined your own 'command'

(lldb) help command
The following subcommands are supported:

      alias   -- Allow users to define their own debugger command
                 abbreviations.  This command takes 'raw' input (no need to
                 quote stuff).
      delete  -- Allow the user to delete user-defined regular expression,
                 python or multi-word commands.
      history -- Dump the history of commands in this session.
      regex   -- Allow the user to create a regular expression command.
      script  -- A set of commands for managing or customizing script commands.
      source  -- Read in debugger commands from the file <filename> and execute
                 them.
      unalias -- Allow the user to remove/delete a user-defined command
                 abbreviation.