March 2008
Intermediate to advanced
288 pages
6h 21m
English
Content preview from iPhone Open Application DevelopmentBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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.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.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.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.
Dumping the UI Hierarchy
In the absence of a fully functional debugger for the iPhone, one aid to developers is the _dumpUIHierarchy method provided by the UIApplication class. A UI dump shows the associations of all display UI objects to each other in a parent/child type of hierarchy. For example, a navigation bar may appear like this in the dump:
<dict>
<key>CGRect</key>
<data>
AAAAAAAAoEEAAKBDAABAQg==
</data>
<key>Children</key>
<array>
<dict>
<key>CGRect</key>
<data>
AAAAAAAAoEEAAAAAAAAAAA==
</data>
<key>Enabled</key>
<false/>
<key>ID</key>
<string><UINavigationItemView: 0x22fe60></string>
</dict>
<dict>
<key>CGRect</key>
<data>
AAB3QwAA+EEAAIhCAADwQQ==
</data>
<key>Enabled</key>
<true/>
<key>ID</key>
<string>BTN Settings</string>
</dict>
</array>
<key>Enabled</key>
<true/>
<key>ID</key>
<string><UINavigationBar: 0x22f380></string>
</dict>
To invoke a dump, call the UIApplication class's _dumpUIHierarchy instance method:
[ self _dumpUIHierarchy: nil ];
An XML-formatted file will be written to /tmp/UIDump. All windowed objects are written to the dump in the hierarchy in which they are currently allocated.
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
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.