May 2014
Intermediate to advanced
576 pages
13h 35m
English
Content preview from Xcode 5 Developer Reference
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Chapter 8: Creating More Advanced Effects with Interface Builder
Creating outlets and actions is a key step in application design with Interface Builder (IB). More complex applications require more advanced skills, which are discussed in this chapter.
Working with Constraints
If you change the form factor of the iPhone version of the IB project created in Chapter 7, by switching between the 3.5” and 4” Simulator views or by rotating the display, you’ll see that the button is no longer centered vertically. When you place objects using IB’s guidelines, the positions are static. They’re not responsive—they don’t keep track of the form factor and screen rotation and rearrange themselves automatically.
Figure 8.1 shows what happens when you rotate the layout in the Simulator when starting with a simplified version of the IB project UI from Chapter 7. Both objects keep their relative alignments but lose their overall alignment to the center line.
The main view works like a window into the UI. If you rotate the UI, the objects don’t move inside it. If you change the widths of either object, you’ll see they don’t keep their horizontal alignment either.
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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.
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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.