Question

I’m trying to figure out how to use the log or debug commands in adding actions to a breakpoint. I can’t seem to figure it out. For something like this:

double currentZoom = [self getZoomScale];

How do I print out the currentZoom? I tried using log as my action, and then doing

currentZoom: @(double)currentZoom@ // this didn't work

currentZoom: @(double)[self getZoomScale]@ // also didn't work

Can someone help me out with this and any other info I may need to log information with breakpoints?

And also a simple example for po an object. Does po always po the description (as in you have to have overridden the description method? Thanks.

Answer 1

If you want to print your double with NSLog, add the following line:

NSLog(@"%f", currentZoom);

Now, if you want to use the debugger console…

If you want to print currentZoom in the console, you don’t need po. Plain p would be enough.This is, type

p currentZoom

and it’s going to show you currentZoom’s value. po is for objects. Let’s say you wrap currentZoom in an NSNumber.

NSNumber currentZoomNumber = [NSNumber numberWithDouble:currentZoom];

Then, to print the value, you would have to do

po currentZoomNumber

Like i said, po is to print objects, it means print object. So you can use it to print any type of object, from NSStrings and NSNumbers to NSDictionaries and NSManagedObjects.