November 2009
Beginner to intermediate
432 pages
9h 9m
English
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Chapter 9. Saving Data and Creating a Secret Button
In This Chapter
Setting and accessing user preferences
Saving data in user preferences
Disabling and enabling text fields
Responding to user touches
In putting together a great iPhone application, a big part of the whole process involves getting your application to work well from the user interface perspective. Your potential user should be able to scroll the keyboard, work with text fields, enter stuff, delete stuff, admire your fashion sense when it comes to images and background color, and generally have a grand-old time exploring the corners of your app.
Interfaces are important — so important, in fact, that most of the chapters so far in this part deal explicitly with how to set up a user-friendly interface — but interfaces are not the only things in the iPhone app universe. For your application to function as an application, it has to do application-like stuff. For example, it has to be able to save data entered by a user for the next time he or she fires up that app. In this chapter, I tackle how to get your app to save data entered by the user. Again, I'm going to trot out my ReturnMeTo application as a means of imparting this little lesson in data saving.
Wait! That's not all! It occurred to me while I was showing people my handy ReturnMeTo application that whoever found my iPhone could accidently enter a number in the text field — corrupting the crime scene, as it were — and then wouldn't know where to call me. So I decided ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.