On Nov 17, 2008, at 11:51 PM, mmalcolm crawford wrote:
On Nov 17, 2008, at 7:12 PM, Brian Stern wrote:
On Nov 17, 2008, at 9:11 PM, mmalcolm crawford wrote:
One other consideration, particularly in iPhone applications, is
where you might have outlets to subviews of a main view that might
be released in sime situations -- e.g. a UIViewController whose
view is released in didReceiveMemoryWarning. To ensure that you
don't prolong the lifetime of objects you got from the nib, you
should set (use your accessor methods to) set those variables to
nil in the relevant method, e.g.:
@interface MyController : UIViewController {
UILabel *label;
...
}
@property (nonatomic, retain) IBOutlet UILabel *label;
then
- (void)didReceiveMemoryWarning {
self.label = nil;
[super didReceiveMemoryWarning];
}
OK, this issue has come up for me very recently. It appears that
on iPhoneOS IBOutlets are retained, regardless of the presence of
properties.
No, on iPhone outlets are consistently *not* retained -- which is
precisely why you do need to retain top-level objects on iPhone. But
absent accessor methods, connections are made using KVC...
This is documented here:
<http://developer.apple.com/iphone/library/documentation/Cocoa/Conceptual/LoadingResources/CocoaNibs/chapter_3_section_4.html#//apple_ref/doc/uid/10000051i-CH4-SW6
>
That's the vague documentation that I referred to. What you're
telling me is that where it says should in that paragraph it really
means must. OK, that's what I figured out a few days ago.
Where it says that it "retains the object by default if no setter
method is available", that seems to contradict what you say about
outlets not being retained. Actually I didn't really absorb that
statement before. It means that if there's no property then the
outlet will be retained. OK.
My experience with the assign property is contrary to what the docs
seem to be saying. I think the outlet is retained even if there is an
assign property.
As I stated originally, following the pattern I describe above makes
memory management consistent in all situations.
I simply don't need properties for all my Outlets, except for this
issue. I also don't really like making all my outlets implicitly
public. But I'm forced to do that.
--
Brian Stern
[EMAIL PROTECTED]
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