OK. Here's the code of my UIViewController:
- (void)viewDidLoad {
[super viewDidLoad];
okButton = [[UIBarButtonItem alloc] initWithTitle:@"OK" style:
UIBarButtonItemStyleBordered target:self action:@selector(okAction:)];
self.navigationItem.rightBarButtonItem = okButton;
[okButton release];
[self.view setBackgroundColor:[UIColor blackColor]];
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"H : m"];
NSDate *date = [dateFormatter dateFromString:@"0 : 0"];
[picker setDate:date];
[dateFormatter release];
}
and if you click on the button, in
-(void) okAction:(id) sender
{
}
the Reference count of 'date' is somehow mystically decreased by 1. There's
no other code in the message
loop, and what I did was directly press the button on the View.
On Fri, Aug 21, 2009 at 3:38 PM, Graham Cox <[email protected]> wrote:
>
> On 21/08/2009, at 5:32 PM, DairyKnight wrote:
>
> NSDate *date = [[NSDate alloc] init];
>> [picker setDate:date];
>> [date release]; // Opps! immediate release of 'date' causes program crash.
>>
>>
>> So is there a rule of thumb, like when should we release immediately after
>> passing the object to some Cocoa API calls?
>>
>
>
> This should work OK, so if it's crashing, you have a bug elsewhere.
>
> Once you are no longer interested in an object, you are free to release it.
> Another object that needs to keep it will retain it.
>
> --Graham
>
>
>
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