Xcode debugging - displaying images

Question

I love using the Xcode debugger. You can take a look at a variable's value and even change it.

But can I somehow DISPLAY the image that is referenced by an image variable? I know I can see its raw bytes, but it would be much more human-friendly to display a window with its contents.

Xcode might not support this. Maybe there is an external tool that would help display images?

Answer 1

Use Quick Look to inspect images in the Xcode debugger.

Select an NSImage or UIImage in the debugger, then click the Quick Look "eye" icon.

Like other areas of OS X, you can also use spacebar to Quick Look!

Quick Look in the debugger can also be implemented for your own classes:

Enabling Quick Look for Custom Types

The variables Quick Look feature in the Xcode debugger allows you to obtain a quick visual assessment of the state of an object variable through a graphical rendering, displayed in a popover window either in the debugger variables view or in place in your source code.

This chapter describes how you implement a Quick Look method for your custom class types so that object variables of those types can also be rendered visually in the Quick Look popover window.