When you call -show, the UIAlertView is retained elsewhere (somewhere
in SpringBoard's internals).
It does look a bit odd, and understandably so, but the -release is
correct there because you still want to relinquish your ownership of
the object...the ownership you took when you sent the -alloc message.
That release doesn't actually deallocate the object because it was
retained by some part of -show's implementation.
Bryan
Sent from my iPhone
On Feb 13, 2009, at 6:02 PM, Boon Chew <waspf...@yahoo.com> wrote:
Hi all,
I am very new to Cocoa programming (but have programmed in C/C++
before) and there is one thing I don't understand with alloc and
release. Sometimes I see code that alloc an object and release it
within the same method, even though it's clear that the object is
still live and well.
For example:
-(IBAction)onButtonPressed
{
UIAlertView *alert = [[UIAlertView alloc] initWithTitle...];
[alert show];
[alert release];
}
Why is the code decrementing the ref count even though the alert
window is still up?
Also, how do you know when you are decrementing ref count too soon?
How do you know which object method you call might increase the ref
count of the object in question?
Thanks!
- boon
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