CODEWITHSUNDEEP
iphoneiospdfuiscrollview
Pangolin
Pangolin

Reputation: 7444

PDF ScrollView not scrolling

My PDF scroll view (copied from Apple’s ZoomingPDFViewer example, but modified a bit) can’t seem to zoom, although it’s displaying the data.

Here is what Apple uses in the example to add it:

CGPDFPageRef PDFPage = CGPDFDocumentGetPage(PDFDocument, 1);
[(PDFScrollView *)self.view setPDFPage:PDFPage];

And because that second line gave me errors, I changed it to this:

CGPDFPageRef PDFPage = CGPDFDocumentGetPage(PDFDocument, 1);
PDFScrollView *sv = [[PDFScrollView alloc] initWithFrame:self.view.frame];
[sv setPDFPage:PDFPage];
self.view = sv;

But now I can’t seem to zoom the PDF.

The Apple one works well without errors, but if I use this line in my app, I get the following error when that view loads:

-[UIView setPDFPage:]: unrecognized selector sent to instance 0x1c5b10b0
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UIView setPDFPage:]: unrecognized selector sent to instance 0x1c5b10b0'
*** First throw call stack:
(0x3424c2a3 0x33a1e97f 0x3424fe07 0x3424e531 0x341a5f68 0x8c499 0x36da3595 0x36df813b 0x36df8081 0x36df7f65 0x36df7e89 0x36df75c9 0x36df74b1 0x36de5b93 0x36de5833 0x79acd 0x36e46275 0x36ec8ea9 0x39249a6f 0x342215df 0x34221291 0x3421ff01 0x34192ebd 0x34192d49 0x34efb2eb 0x36dd8301 0x6e601 0x38e17b20)
libc++abi.dylib: terminate called throwing an exception

The only other difference in my setup is that the view controller where this is called is inside a navigation controller, which is inside of a tab bar controller. But I can’t see how this would affect the problem.

Any tips?

[UPDATE]

This is my custom init method:

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        self.decelerationRate = UIScrollViewDecelerationRateFast;
        self.delegate = self;
        self.scrollEnabled = true;
    }
    return self;
}

It is the same as initWithCoder except that I added self.scrollEnabled = true;.

I also tried these, and it still didn’t work:

//UIScrollView *sv = [[UIScrollView alloc] initWithFrame:self.view.frame];
PDFScrollView *sv = [[PDFScrollView alloc] initWithFrame:self.view.frame];
self.view = sv;
[(PDFScrollView *)self.view setPDFPage:PDFPage];

When I use the commented-out line (UIScrollView), it gives me the same error, except that it says [UIScrollView setPDFPage:]: unrecognized.... When I use the uncommented line (PDFScrollView), it gives me no error and shows the PDF, but there’s still no zooming.

Upvotes: 1

Views: 731

Answers (1)

Jack Humphries
Jack Humphries

Reputation: 13267

self.view must be a scroll view in order to be cast as a PDFScrollView and accept its methods. By default, self.view is a UIView. Either change the view to a scroll view in your XIB file (delete the view and link the scroll view to view in File's Owner) or do it programmatically.

Upvotes: 2

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