want to completely dealloc object's memory - iphone

Question

In one controller I add other controller's view in the following way:
objSecondController = nil;
objSecondController = [[SecondController alloc]initWithNibName:#"SecondController"
bundle:nil];
[self.view addSubview:objSecondController.view];
In view did load of objSecondController I do the following:
self.pdfView = [[PDFView alloc] init];
[self.view addSubview:self.pdfView.view];
and then I specify pdf according to its methods
In one of button clicks method for changing the pdf I do the following:
if(self.pdfView)
{
[self.pdfView.view removeFromSuperview];
[self.pdfView release];
self.pdfView = nil;
}
and then again do:
self.pdfView = [[PDFView alloc] init];
[self.view addSubview:self.pdfView.view];
and then I specify pdf according to its methods
Now self.pdfView is third party library, whenever I use self.pdfview its retain count increases automatically so when I release self.pdfView its retain count does not become 0 and so it does not dealloc though I release them.
The pdf are as large as 25MB and 39 MB so as the previous memory does not dealloc totally it crashes due to excess memory.
What should I do so self.pdfView releases memory completely, so it does not create problem while loading other large pdf?

Answer 1

Assuming you have properly implemented setter/getter methods, then you are retaining the pdfView one-too-many-times with this code:
self.pdfView = [[PDFView alloc] init];
[self.view addSubview:self.pdfView.view];
This is because the setter for pdfView will also call retain.
You need to use:
self.pdfView = [[[PDFView alloc] init] autorelease];
[self.view addSubview:self.pdfView.view];
Also remove this statement, as it's not necessary:
[self.pdfView release];
As this is sufficient:
self.pdfView = nil;
I would suggest allocating pdfView in the init method and releasing it in dealloc and just changing the PDF within the view in both viewDidLoad and whenever the Change PDF button is pressed. There is no need to init/addSubview/removeFromSuperview/release the PDFView object whenever its content should change.