Re: Using dot syntax for non-@property properties?
Re: Using dot syntax for non-@property properties?
- Subject: Re: Using dot syntax for non-@property properties?
- From: email@hidden
- Date: Wed, 7 Nov 2007 11:14:06 +0900
On 平成 19/11/07, at 10:30, Joshua Emmons wrote:
One of the dot syntax "Usage Summaries" from "The Objective-C 2.0
Programming Language" is:
xOrigin = aView.bounds.origin.x;
This leads me to believe that I can replace the following code:
-(void)viewClicked:(id)sender{
NSSize size = [sender bounds].size;
size.height *= 2;
[[sender animator] setBoundsSize:size];
}
with something like:
-(void)viewClicked:(id)sender{
NSSize size = sender.bounds.size;
size.height *= 2;
sender.animator.boundsSize = size;
}
However, when I do so, I get errors like "request for member
'bounds' in something not a structure or a union". It sounds to me
like the compiler has no idea what's going on with the dot there.
Or, at least, it's definitely not [sender bounds], which is what I
would have expected. What am I overlooking here?
You can declare a property in a category, like so:
@interface NSView (Properties)
@property (assign) NSRect bounds;
@end
@interface NSView (Properties)
@dynamic bounds;
@end
As long as there is a <key> and set<key> method pair, you can "tack"
on a property.
I've done it for some pre-leopard objects such as a subviews property
etc on NSView...
Andre
Many thanks,
-Joshua Emmons
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