Xcode Debugger view value of variable

Question

My code in a UITableViewController   delegate myData    myData objectAtIndex indexPath row     How can I see the values of delegate myData or indexPath row in the Debugger  delegate myData should be an array and indexPath row an int  I can only see memory addresses of the objects delegate and indexPath but where are myData and row

User · Answer

You can print values onto console window at run-time. Below are steps :

Place a break-point for which you want to get values
Now perform step-by-step debug.
Place a cursor on variable/delegate whose value is to be checked at run-time.
Now this will show description of variable/delegate
Clicking on "i" will show detailed description
This will also print details onto console window.

Screenshot for printing details on console window

User · Answer

I agree with other posters that Xcode as a developing environment should include an easy way to debug variables  Well  good news  there IS one   After searching and not finding a simple answer tutorial on how to debug variables in Xcode I went to explore with Xcode itself and found this  at least for me  very useful discovery   How to easily debug your variables in Xcode 4 6 3  In the main screen of Xcode make sure to see the bottom Debug Area by clicking the upper-right corner button showed in the screenshot       Now set a Breakpoint     the line in your code where you want your program to pause  by clicking the border of your Code Area     Now in the Debug Area look for this buttons and click the one in the middle  You will notice your area is now divided in two       Now run your application   When the first Breakpoint is reached during the execution of your program you will see on the left side all your variables available at that breakpoint     You can expand the left arrows on the variable for a greater detail  And even use the search field to isolate that variable you want and see it change on real time as you  Step into  the scope of the Breakpoint     On the right side of your Debug Area you can send to print the variables as you desire using the mouse s right-button click over the desired variable     As you can see  that contextual menu is full of very interesting debugging options  Such as Watch that has been already suggested with typed commands or even Edit Value    that changes the runtime value of your variable

User · Answer

Check this How to view contents of NSDictionary variable in Xcode debugger   I also use   po variableName print variableName   in Console   In your case it is possible to execute   print  myData objectAtIndex indexPath row      or   po  myData objectAtIndex indexPath row

User · Answer

This gets a little complicated  These objects are custom classes or structs  and looking inside them is not as easy on Xcode as in other development environments   If I were you  I d NSLog the values you want to see  with some description   i e   NSLog   Description of object   time   i   indexPath row

User · Answer

Also you can    Set a breakpoint to pause the execution  The object must be inside the execution scope Move the mouse pointer over the object or variable A yellow tooltip will appear Move the mouse over the tooltip Click over the two little arrows pointing up and down A context menu will pop up Select  Print Description   it will execute a  object description  The description will appear in the console s output   IMHO a little bit hidden and cumbersome

User · Answer

Try Run- Show- Expressions  Enter in the name of the array or whatever you re looking for

User · Answer

Your confusion stems from the fact that declared properties are not  necessarily named the same as   instance  variables   The expresion  indexPath row   is equivalent to   indexPath row    and the assignment  delegate myData    myData objectAtIndex indexPath row     is equivalent to   delegate setMyData  myData objectAtIndex  indexPath row       assuming standard naming for synthesised properties   Furthermore  delegate is probably declared as being of type id lt SomeProtocol gt   i e   the compiler hasn   t been able to provide actual type information for delegate at that point  and the debugger is relying on information provided at compile-time  Since id is a generic type  there   s no compile-time information about the instance variables in delegate   Those are the reasons why you don   t see myData or row as variables   If you want to inspect the result of sending -row or -myData  you can use commands p or po   p  NSInteger  indexPath row  po  delegate myData    or use the expressions window  for instance  if you know your delegate is of actual type MyClass    you can add an expression  MyClass   delegate  or right-click delegate  choose View Value as    and type the actual type of delegate  e g  MyClass      That being said  I agree that the debugger could be more helpful    There could be an option to tell the debugger window to use run-time type information instead of compile-time information  It d slow down the debugger  granted  but would provide useful information  Declared properties could be shown up in a group called properties and allow for  optional  inspection directly in the debugger window  This would also slow down the debugger because of the need to send a message execute a method in order to get information  but would provide useful information  too

[iphone] Xcode Debugger: view value of variable

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