How to print call stack in Swift?

swift debugging callstack
Boon picture Boon · Jun 10, 2015 · Viewed 24.9k times · Source

In Objective-C, you can print the call stack by doing the following:

NSLog(@"%@", [NSThread callStackSymbols]);

How do you do this in Swift without using Foundation class?

Answer

Duncan C picture Duncan C · Jun 13, 2015

As Jacobson says, use the following:

Swift 2:

print(NSThread.callStackSymbols())

Swift 3 / Swift 4:

print(Thread.callStackSymbols)

That's Swift code. It's using a Foundation method, but so does 90%+ of what you do on iOS.

EDIT:

Note that the formatting looks better if you use:

Thread.callStackSymbols.forEach{print($0)}

From the debugger command line you can type 

e Thread.callStackSymbols.forEach{print($0)}

Related questions

Swift: print() vs println() vs NSLog()

What's the difference between print, NSLog and println and when should I use each? For example, in Python if I wanted to print a dictionary, I'd just print myDict, but now I have 2 other options. How and when should I …

Read More
Printing a variable memory address in swift

Is there anyway to simulate the [NSString stringWithFormat:@"%p", myVar], from Objective-C, in the new Swift language? For example: let str = "A String" println(" str value \(str) has address: ?")

Read More
`po` gives `error: <EXPR>:1:1: error: use of unresolved identifier`

I have this problem with po in the console where trying to output a function works in itself, but outputting a variable or constant doesn't. As you can see here, although you'd think the var/let holds the content of …

Read More