How do I quickly inspect the value of an arbitrary

问题:

It seems reasonably widely acknowledged that it is slow to use the po command in Xcode 4.6.x. What are the options for inspecting the values of arbitrary variables unspecified at compile time (which rules out usage of NSLog()) which don't take > 15s?

回答1:

Just set a breakpoint where you want to learn the variables' value. Once the program is paused, a summary of all the variables' value will appear on the Varibles view on the left-bottom of the screen. Here is a screenshot :

回答2:

You can use the lldb commands:

p (int) myInt
po myObject
po myObject.memberObject
p (float) myObject.floatMember

Just a note, you could also use p instead of po in the newest version of Xcode. If you run the help -a in llb, it will present you with command aliases, below is a snippet of the commands you could use.

> (lldb) help -a  
p         -- ('expression --')  Evaluate a C/ObjC/C++ expression in the current
         program context, using user defined variables and variables
         currently in scope.  

po        -- ('expression -o  --')  Evaluate a C/ObjC/C++ expression in the
         current program context, using user defined variables and
         variables currently in scope  

print     -- ('expression --')  Evaluate a C/ObjC/C++ expression in the current
         program context, using user defined variables and variables
         currently in scope.

回答3:

Turns out the answer is pretty simple: download Xcode 4.6.2 where LLDB debugging speed has been increased significantly. Note some discussion over here