UIPageViewController-PDF 缩放不工作 xcode？

Question

我正在使用下面的 github 项目

https://github.com/jackhumphries/UIPageViewController-PDF

问题是 pdf 正在加载并且页面卷曲效果正在工作，但我无法放大和缩小我加载的 pdf 文档我尝试调试以及为什么它不工作但我找不到解决方案，我检查了 PDFScrollView 委托方法，它们都已实现，但是当我尝试放大/缩小时，这些方法没有调用。

这里有这些方法：

- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView
{

       return self.tiledPDFView;
}

- (void)scrollViewWillBeginZooming:(UIScrollView *)scrollView withView:(UIView *)view
{
    // Remove back tiled view.
    [self.oldTiledPDFView removeFromSuperview];

    // Set the current TiledPDFView to be the old view.
    self.oldTiledPDFView = self.tiledPDFView;

    [self addSubview:self.oldTiledPDFView];
}

- (void)scrollViewDidEndZooming:(UIScrollView *)scrollView withView:(UIView *)view atScale:(float)scale
{
    // Set the new scale factor for the TiledPDFView.
     _PDFScale *= scale;

    // Calculate the new frame for the new TiledPDFView.
    CGRect pageRect = CGPDFPageGetBoxRect(_PDFPage, kCGPDFMediaBox);

    pageRect.size = CGSizeMake(pageRect.size.width*_PDFScale,  pageRect.size.height*_PDFScale);

    // Create a new TiledPDFView based on new frame and scaling.
    TiledPDFView *tiledPDFView = [[TiledPDFView alloc] initWithFrame:pageRect scale:_PDFScale];

    [tiledPDFView setPage:_PDFPage];

    // Add the new TiledPDFView to the PDFScrollView.
    [self addSubview:tiledPDFView];

     self.tiledPDFView = tiledPDFView;
}

我有这个代码：

-(id)initWithPDFAtPath:(NSString *)path {

  NSURL *pdfUrl = [NSURL fileURLWithPath:path];

  PDFDocument = CGPDFDocumentCreateWithURL((__bridge CFURLRef)pdfUrl);

  totalPages = (int)CGPDFDocumentGetNumberOfPages(PDFDocument);

  self = [super initWithNibName:nil bundle:nil];

  return self;

}

我想在上面的代码中实现下面的代码

/*
 Open the PDF document, extract the first page, and pass the page to the PDF scroll view.
 */
NSURL *pdfURL = [[NSBundle mainBundle] URLForResource:@"TestPage" withExtension:@"pdf"];
CGPDFDocumentRef PDFDocument = CGPDFDocumentCreateWithURL((__bridge CFURLRef)pdfURL);
CGPDFPageRef PDFPage = CGPDFDocumentGetPage(PDFDocument, 1);
[(PDFScrollView *)self.view setPDFPage:PDFPage];
CGPDFDocumentRelease(PDFDocument);

Answer 1

将此方法添加到PDFScrollView：

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

     self.minimumZoomScale = 1.0;
     self.maximumZoomScale = 3.0;
   }
   return self;
}

并将最后两行添加到scrollViewDidEndZooming

- (void)scrollViewDidEndZooming:(UIScrollView *)scrollView withView:(UIView *)view atScale:(float)scale
{
  ....
  self.minimumZoomScale = 1.0/scale;
  self.maximumZoomScale = 3.0*scale;

}

请注意，只有在页面处于最低缩放级别时才能更改页面（就像在几个阅读器应用中发生的情况一样）。