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Re: Using dot syntax for non-@property properties?
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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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