add tag button
autolayout
works fine in iPhone 5s
present popup
autolayout
rounded rect
iOS8
commit
why the delegate method isn't called?
Load message successfully because overriding initWithNib method:

1. in locationsDetailViewController, we initialize the nib by calling initWithNib method, so here's where we should initialize locationManager
pass _location by delegate
refine delegate to pass place mark object
storyboard
adjust layout