在iphone应用程序中从UIScrollView创建PDF [英] Creating PDF from UIScrollView in iphone app

问题描述

我正在从UIView创建pdf到pdf它运行正常但我有 scrollView 我想要转换为pdf的内容但它只显示pdf中的可见部分而不是整个 scrollView 内容。这是我的代码

I am creating pdf from UIView to pdf it works fine but i have scrollView with content which i want to convert to pdf but it only show visible part in pdf not the whole scrollView content. here is my code

-(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);
}

推荐答案

这会给你可见的部分UIScrollView

THis gives you the visible portion of the UIScrollView

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;

所以你可以在 UIGraphicsBeginPDFContextToData中使用它（pdfData，aView.bounds，nil ）;

参数的一些细微变化。

so you can use this in UIGraphicsBeginPDFContextToData(pdfData, aView.bounds, nil);
by some minor changes in the parameters.

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