one alloc, retainCount == 2

I have a following code:

NSLog(@"%d", [chart retainCount]);

self.chart =开发者_如何学Go [[BNPieChart alloc] initWithFrame:self.view.frame];
NSLog(@"%d", [chart retainCount]);

Terminal shows:

[Session started at 2011-03-28 11:09:46 +0200.]
2011-03-28 11:09:51.008 Finance[35111:207] 0

2011-03-28 11:09:51.010 Finance[35111:207] 2

As I know, retainCount should be equal to 1, not 2.

You chart property defined as retain or copy, so:

self.chart = [[BNPieChart alloc] initWithFrame:self.view.frame];

+1 retain at alloc ([BNPieChart alloc])
+1 retain at assignment (self.chart = )

chart is probably a retained property, that's why you have 2 retainCount. That's why you can see some declaration like that :

BNPieChart *aChart = [[BNPieChart alloc] initWithFrame:self.view.frame];
self.chart = aChart;
[aChart release];

Due to self in the statement its retain count is 2 as property of the chart is declared as retain Remove self from the statement

change

 self.chart = [[BNPieChart alloc] initWithFrame:self.view.frame];

to

 chart = [[BNPieChart alloc] initWithFrame:self.view.frame];

How do you know that the retainCount should be 1? Are you the author of the -setChart: method you are calling? How is it implemented? Why didn't you include it in the post?

Nothing you have posted here is suspicious.

There are 3 possible problems I see:

1. When you synthesized the chart property, it was synthesized with a retain attribute
2. You have called retain in a self-implemented getter method
3. Whoever wrote the initializer method for BNPieChart or its superclass's designated initializer had a retain in the initializer.

Have you seen the code for BNPieChart and its non-Cocoa superclasses? If you can, try to post the initializer code.