4

我正在从 UIView 创建 pdf 到 pdf，它工作正常，但我有scrollView我想转换为 pdf 的内容，但它只显示 pdf 中的可见部分而不是全部scrollView内容。这是我的代码

-(void)createPDFfromUIView:(UIView*)aView saveToDocumentsWithFileName:(NSString*)aFilename
 {    
    NSMutableData *pdfData = [NSMutableData data];

    // Get Scrollview size
    CGRect scrollSize = CGRectMake(1018,76,scrollView.contentSize.width,scrollView.contentSize.height);

    // Points the pdf converter to the mutable data object and to the UIView to be converted
    UIGraphicsBeginPDFContextToData(pdfData, scrollSize, nil);
    UIGraphicsBeginPDFPage();
    CGContextRef pdfContext = UIGraphicsGetCurrentContext();


    // draws rect to the view and thus this is captured by UIGraphicsBeginPDFContextToData

    [aView.layer renderInContext:pdfContext];





    // remove PDF rendering context
    UIGraphicsEndPDFContext();

    // Retrieves the document directories from the iOS device
    NSArray* documentDirectories = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask,YES);

    NSString* documentDirectory = [documentDirectories objectAtIndex:0];
    NSString* documentDirectoryFilename = [documentDirectory stringByAppendingPathComponent:aFilename];

    // instructs the mutable data object to write its context to a file on disk
    [pdfData writeToFile:documentDirectoryFilename atomically:YES];
    NSLog(@"documentDirectoryFileName: %@",documentDirectoryFilename);
}
4

4 回答 4

1

这段代码我用来从 uiscrollview 制作 pdf，它确实有帮助，但它不会像我们在 pdf 上绘制那样好——请看——来自 UIScrollView 的 Pdf 

- (void) createPDF
{
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSString *directroyPath = nil;
    directroyPath = [documentsDirectory stringByAppendingPathComponent:@"temp"];
    NSString *filePath = [directroyPath stringByAppendingPathComponent:@"test.pdf"];
    // check for the "PDF" directory
    NSError *error;
    if ([[NSFileManager defaultManager] fileExistsAtPath:filePath]) {

    } else {
        [[NSFileManager defaultManager] createDirectoryAtPath:directroyPath
                                  withIntermediateDirectories:NO
                                                   attributes:nil
                                                        error:&error];
    }

    CGContextRef pdfContext = [self createPDFContext:_scrollView2.bounds path:(CFStringRef)filePath];
    NSLog(@"PDF Context created");

    /*
     Here limit of i is no of pages in your uiscrollview or
     you can use hit and trial here because there is a
     length of page is going to be equal to 
     the visible size of uiscrollView in your application 
   */

    for (int i = 0 ; i< 2 ; i++)
    {

        // page 1
        CGContextBeginPage (pdfContext,nil);

        //turn PDF upsidedown
        CGAffineTransform transform = CGAffineTransformIdentity;

       //here 365 is equal to the height of myScrollView.frame.size.height

        transform = CGAffineTransformMakeTranslation(0, (i+1) * 365);
        transform = CGAffineTransformScale(transform, 1.0, -1.0);
        CGContextConcatCTM(pdfContext, transform);

        //Draw view into PDF
        [_scrollView2.layer renderInContext:pdfContext];
        CGContextEndPage (pdfContext);
        [_scrollView2 setContentOffset:CGPointMake(0, (i+1) * 365) animated:NO];

    }
    CGContextRelease (pdfContext);
}

- (CGContextRef) createPDFContext:(CGRect)inMediaBox path:(CFStringRef) path
{
    CGContextRef myOutContext = NULL;
    CFURLRef url;
    url = CFURLCreateWithFileSystemPath (NULL, path,
                                         kCFURLPOSIXPathStyle,
                                         false);

    if (url != NULL) {
        myOutContext = CGPDFContextCreateWithURL (url,
                                                  &inMediaBox,
                                                  NULL);
        CFRelease(url);
    }
    return myOutContext;
}
于 2014-05-15T10:30:37.127 回答
1 
(void)createPDFfromUIView:(UIScrollView*)aView saveToDocumentsWithFileName:(NSString*)aFilename
{
    // Creates a mutable data object for updating with binary data, like a byte array
    NSMutableData *pdfData = [NSMutableData data];

    // Get Scrollview size
    CGRect scrollSize = CGRectMake(aView.origin.x,aView.origin.y,aView.contentSize.width,aView.contentSize.height);

    // Points the pdf converter to the mutable data object and to the UIView to be converted
    UIGraphicsBeginPDFContextToData(pdfData, scrollSize, nil);
    UIGraphicsBeginPDFPage();
    CGContextRef pdfContext = UIGraphicsGetCurrentContext();


    // draws rect to the view and thus this is captured by UIGraphicsBeginPDFContextToData

    [aView.layer renderInContext:pdfContext];

    // remove PDF rendering context
    UIGraphicsEndPDFContext();

    // Retrieves the document directories from the iOS device
    NSArray* documentDirectories = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask,YES);

    NSString* documentDirectory = [documentDirectories objectAtIndex:0];
    NSString* documentDirectoryFilename = [documentDirectory stringByAppendingPathComponent:aFilename];

    // instructs the mutable data object to write its context to a file on disk
    [pdfData writeToFile:documentDirectoryFilename atomically:YES];
    NSLog(@"documentDirectoryFileName: %@",documentDirectoryFilename);
}
于 2013-05-17T06:06:19.957 回答
1

这为您提供了 UIScrollView 的可见部分

CGRect visibleRect;
visibleRect.origin = scrollView.contentOffset;
visibleRect.size = scrollView.bounds.size;

float theScale = 1.0 / scale;
visibleRect.origin.x *= theScale;
visibleRect.origin.y *= theScale;
visibleRect.size.width *= theScale;
visibleRect.size.height *= theScale;

因此您可以UIGraphicsBeginPDFContextToData(pdfData, aView.bounds, nil);
通过对参数进行一些小的更改来使用它。

于 2013-05-17T04:46:05.430 回答
0

将滚动视图内容转换为 PDF 文件的最简单方法是将内容视图作为滚动视图的第一个子视图，并使用该视图拍摄滚动视图的快照。Swift 中的代码如下所示：

func generatePDFdata(withView view: UIView) -> NSData {

  let pageDimensions = view.bounds
  let outputData = NSMutableData()

  UIGraphicsBeginPDFContextToData(outputData, pageDimensions, nil)
  if let context = UIGraphicsGetCurrentContext() {
      UIGraphicsBeginPDFPage()
      view.layer.render(in: context)
  }
  UIGraphicsEndPDFContext()

  return outputData
}

然后，您可以使用outputData写入 PDF 文件： 

outputData.write(to: pdfFileUrl, atomically: true)
于 2019-07-21T22:29:21.167 回答