Release doesn't change retain count
I am trying to release an object but the retain count doesn't change after the release:
NSLog(@"removeTableViewScreen object retainCount1 [%d]", [myObject retainCount]);
[myObject release];
NSLog(@"removeTableViewScreen object retainCount2 [%d]", [myObject retainCount]);
The output to the console is as follows:
3/3/09 5:23:07 PM removeTableViewScreen myObject retainCount1 [1]
3/3/09 5:23:07 PM removeTableViewScreen myObject retainCount2 [1]
Why wouldn't the release lower the retain count to 0??
Thanks
NSObject Protocol Reference - retainCount
<Edited by Moderator>
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Custom UITableViewCell from Interface Builder with retain count 2
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I am creating a customViewCell in my UITableViewController (which I was creating in IB) - the wired thing: it has a retain count of 2! Any hints why?
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my cell has no init method, no "retain" nor do I send anywhere a retain to it..Hey Alex!
sommeralex wrote:
I am creating a customViewCell in my UITableViewController (which I was creating in IB) - the weird thing: it has a retain count of 2! Any hints why?
Your code is obtaining the retain count by sending the [retainCount|http://developer.apple.com/library/ios/documentation/Cocoa/Referen ce/Foundation/Protocols/NSObjectProtocol/Reference/NSObject.html#//appleref/doc/uid/20000052-BBCDAAJI] message, so this warning in the doc applies:
Important: This method is typically of no value in debugging memory management issues. Because any number of framework objects may have retained an object in order to hold references to it, while at the same time autorelease pools may be holding any number of deferred releases on an object, it is very unlikely that you can get useful information from this method.
I think the above is telling us that retainCount returns an accurate number, but that number is useless because we don't know how many releases are pending. E.g., suppose your code has released an object prematurely, so your logical count should be zero. However, if the runtime system has retained the object 5 times at that stage, retainCount will return 5. The point is that all 5 of those retains will be released at some future time not of our choosing.
You can override retain and release to keep your own count, but I don't know if that count is any more useful than what you get from retainCount.
I think the only retain count that's any of our business is the number of retains and releases we see in our code. In other words, I think the logical count is much more useful than the real count:
UIViewController *c = [[UIViewController alloc]
initWithNibName:CellIdentifier bundle:nil]; // Line A: +1
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Based on the doc for the ['view' property of UIViewController|http://developer.apple.com/library/ios/documentation/UIKit/Ref erence/UIViewControllerClass/Reference/Reference.html#//appleref/doc/uid/TP40006926-CH3-SW2], the view object should be created and retained once when the nib is loaded in Line A (except if no view object is included in the nib, in which case the view would be created and retained once in Line B). The view would then be released once when the view controller is released in Line C.
So using my arithmetic, the view's retain count is zero after Line C. If that's correct, the only thing saving you from a crash might be one of those system retains we don't know about. You could test my analysis by not giving the view to a table view, then checking to see if it still exists at some point after the end of the current event cycle. You could implement dealloc with a NSLog statement in your custom view to see if and when the view is actually freed.
Absent any further analysis, I would advise retaining and autoreleasing the view before releasing the controller (or just autoreleasing the controller), to make sure the view lasts until retained by your table view.
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Message was edited by: simniesimnie wrote:
... I just don't get why releasing my list view controller crashes the program while releasing the map view controller does not.
When you release both controllers at the end of the code block you posted, the retain count for each of those controllers will go to zero, and they will be deallocated, even though--as you pointed out--the view which was added to 'segmentView' will continue to be retained by its superview (i.e. prior to the release of its controller, its retain count was +2, since it had been retained by the controller when the controller and view were created, then retained again by the superview).
If and when the program crashes depends on whether and when any messages are sent to the deallocated objects. As soon as the table view is added to the superview, it's going to start sending messages to its data source, so if the invalid 'listView' address is also the address of the table view's data source, I would expect an immediate crash. To provoke a crash because of the invalid 'mapView' address, someone would need to send a message to that address.
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This is the correct solution. You want each controller to be retained by the respective property setter.
Btw, I'm not sure why you create both controllers in a method that only seems to use one of them. Since you're now using a retaining property to store the address of each controller you won't leak the memory for the controller when you enter that code multiple times, because the setter for that property will automatically release the previous controller when you replace it with a new one.
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\- Ray
Message was edited by: RayNewbie -
Property behaviour curiosity with retain counts
Hey folks,
I've been encountering a behaviour with retain counts and properties that I don't expect. I hope someone can clear it up. Assuming this contrived code:
// Public header
@interface ObjectB : NSObject
float m_FloatValue;
@property(readwrite) floatValue;
@end
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Reset iOS device: Hold down the On/Off button and the Home button at the same time for at
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- Restore to factory settings/new iOS device.
Also, the US daylight saving time starts tonight. Sometimes the iOS has problems around DST -
As stated. The html container doesn't change to match the content on the website (like Internet Explorer does), it changes to match the screen size. That way, when you scroll horizontally, elements disappear because the html container is the size of the screen and in a fixed position.
Example (my problem): http://www.elitepvpers.com/forum/web-development/1847846-question-css-html-width-problem.html
Happens with most websites such as...
http://google.com/
http://co.91.com/index/
http://www.w3schools.com/
http://stackoverflow.comlocked by moderator as dulicate
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