Mobile Devices

150 ◾ Scott R. Ellis

to each. In Xcode, a framework provides a grouping of generic func-

tionality. Much of the core features are those of similarity to your iOS-

powered devices.

Coding and Application Design Tip

One quick note about pop- ups—in my ever so humble opinion, pop- ups are a

crutch and should be avoided at all costs. You may nd yourself creating an

application that allows a user to delete all of his contacts, and then you ask,

in an annoying pop- up: “Do you really want to do this?” So, there actually

is such a thing as a dumb question, and asking a user if he really wants to do

something rises to the pinnacle of developer arrogance.

“But wait!” you say. “If I can’t seek conrmation of something, then what do

I do when someone ...