Kartick Vaddadi Kartick Vaddadi - 8 months ago 39
iOS Question

How do I inspect the view hierarchy in iOS?

Is there a GUI tool that inspects the view hierarchy of an iOS app? I'm thinking about Webkit's web inspector or similar tools. I'm looking to debug layout issues, like views having the wrong position or size, or a child not being properly contained in its parent. Currently I have to add asserts that test these various conditions by hand, or set different background colours on different views, and as you can imagine, that's a really tedious way to go about it.

I looked at Instruments's

UI recorder
, but that only records and plays back UI actions` and, in any case, works only for Mac apps.

Is there a better solution?


I don't know if there is a GUI view inspection tool, but I have had some luck with the debugging method on UIView: -recursiveDescription

if you pause the program in the debugger and input this into GDB (Edit: also works in LLDB)

po [[UIWindow keyWindow] recursiveDescription]

You get a printout of your entire view hierarchy. You can also call it on a specific view to get a printout of the view hierarchy of that view.

It can be a little tedious to wade through the info you get out of it, but it has proved useful to me.

Credit goes to this blog post which talked about this method and also linked to this helpful, but rather hard to find Apple tech note.