在Xcode中进行调试时，如何查看值？

Question

I'm trying to see what the value of myImage.height is in the debug mode in Xcode, I've got a breakpoint on this line...

float s=myImage.height/cos(30*M_PI/180)/2;

It all runs fine and get's to that line, in the debug panel I can see myImage (my Image is a Sparrow framework SPImage object) but I can't see any values for any of the class vars.

This is literally the first time I've used a break point/debug panel in xcode so I'm probably just not doing something right.

I also tried

NSLog(@"myImage height: %f",myImage.height);

But I can't see that being outputted in the output panel either.

I'm coming from a AS3 background, where you would see...

myImage.height along with it's value to the right in the debug panel in Flash, so I'm looking for the same thing in Xcode. Do I have to run it in a different mode or is there another panel to open or something?

Answer 1

In the console area, you can show 2 distinct "parts", one is the variables in scope, and the other is the actual output console. In the stack area, you can see all variables in scope.

You can also hover your mouse over any variable in code , then click on the little disclosuer arrow and select "print description" to have it plop it into the console. (The console is also where NSLog stuff goes).

Check out this picture:

And then this one:

Note you can also "print description" from the variable area:

edit here's more detail on the hover-access to the value: Click on the variable name, then move the mouse to the right, and there should pop up a yellow bar with info about the instance. This is is different from the little blue arrow, which is available even when not debugging.

Answer 2

If anything is being outputted, it's in the bottom panel. There are three icons on the top right of the bottom panel, and each one shows different data views. Try all three. In case you can't see the bottom panel, you can show it with the middle button in the segmented control above the word "View" in the top right of your XCode window.