如何在调试器中查看值？

Question

In Xcode 6.3, how do I view the values of objects such as:

arrary count: myarray.count

TableView index: indexPath.item

These don't show up in the debugger and I don't know how to print them out into the console.

Answer 1

When the app is paused on a breakpoint, the debugger (lldb) has a few commands available.

To (p)rint (o)ut an object, you can do:

po myObject.debugDescription
po myArray.count
...

Answer 2

The easiest way is to log them to console using NSLog / println depending on which language you use.

In Objective-C:

NSLog(@"My Array Count: %i", myarray.count");

In Swift:

println("My Array Count: \(myarray.count)")

Same goes for indexPath.item - you can print item, row, selection or even whole content of your cell, such as textLabel's text, the same way you print number of items in an array.

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For more advanced way of accesing number of items in your memory (such as a count of an array), you can always use Apple's Instruments application, and its build in Allocations .
From there you can track how many objects you have in your memory: