Re: First-Time Help Needed: Instantiating a Subclass in IB
Re: First-Time Help Needed: Instantiating a Subclass in IB
- Subject: Re: First-Time Help Needed: Instantiating a Subclass in IB
- From: Sherm Pendley <email@hidden>
- Date: Fri, 14 Oct 2005 23:12:01 -0400
On Oct 14, 2005, at 10:34 PM, Jerry Krinock wrote:
Ok, so I find a white rectangle that looks like an NSTextField, with a
tooltip that says "NSTextField", drag and drop it into my window.
Choose Tools > Show Info, choose Custom Class from the menu ...
select your class from the list, and double-click ...
OK, I did that. Now I see in my nib's main document window,
Instances tab,
list view, that this field is a "MyTextField". Looks cool.
My problem: At run-time, my subclass' -initWithFrame method
doesn't run for
this field.
It's not supposed to. From "What Happens When a NIB File is Loaded":
"When you drag a standard object into the design window, Interface
Builder encodes the actual class for that object, initializing the
object as it builds the nib file. For custom subclasses of such
objects, Interface Builder encodes the standard object but tells the
archiver to swap in your custom class when the object is unarchived.
These objects are also initialized when the nib file is built.
Therefore, when the nib file is loaded, initWithFrame: is not called
for either standard objects or custom subclasses of standard objects.
...
Therefore, if you create a custom subclass of NSView, add a Custom
View object to your design window, and assign your custom subclass to
that object, your initWithFrame: method will be called when the nib
is loaded. For all other objects, whether standard Interface Builder
objects or custom subclasses of standard objects, initWithFrame: is
never called.
If you need to initialize a standard Interface Builder object (or a
custom subclass of such an object) after its nib file has been
loaded, create an awakeFromNib method for the object. ..."
Found here:
<http://tinyurl.com/9ksjz>
<http://developer.apple.com/documentation/Cocoa/Conceptual/
LoadingResources/Concepts/NibFileLoaded.html>
sherm--
Cocoa programming in Perl: http://camelbones.sourceforge.net
Hire me! My resume: http://www.dot-app.org
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