2015-06-16 AutoLayout in WWDC 2015

Be sure to check out these videos on AutoLayout:

• Mysteries of Auto Layout, Part 1
• Mysteries of Auto Layout, Part 2

There's some stuff in there that you may already know, but they also explain new stuff. My highlights:

• First use stackviews, then for the rest, use constraints
• Don't add and remove constraints, activate and deactivate them
• For text, you might want to use firstBaseline and lastBaseline
• Use "alignment rects" if you need to ignore extra stuff in your views (like shadows)

And in part 2:

• Use the .identifier property on views when debugging, it's a string that'll show up in the log
• Use method in the debugger called constraintsForAxis or something
• There's a trace method in the debugger: po [self.view _autolayoutTrace] (can show ambiguous layouts); then on the LLDB prompt: po [object exerciseAmbiguityLayout]
• While your app is running, check the menu Debug, option View Debugging