Question

我试图从HTML（webview）创建PDF。我做的。但是，我面临的问题是我正在获得一个垂直＆amp;每页1条水平线。正如我在此链接中所附。

Click for image 如果你看不到线条，请放大。

我试过这段代码

// Creates a mutable data object for updating with binary data, like a byte array
    NSMutableData *pdfData = [NSMutableData data];

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


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

    [webView.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:@"tmp.pdf"];

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


        // Creates a mutable data object for updating with binary data, like a byte array
    NSString *heightStr = [webView stringByEvaluatingJavaScriptFromString:@"document.body.scrollHeight;"];

    int height = [heightStr intValue];
    //  CGRect screenRect = [[UIScreen mainScreen] bounds];
    //  CGFloat screenHeight = (self.contentWebView.hidden)?screenRect.size.width:screenRect.size.height;
    CGFloat screenHeight = webView.bounds.size.height;
    int pages = ceil(height / screenHeight);

    UIGraphicsBeginPDFContextToData(pdfData, webView.bounds, nil);
    CGRect frame = [webView frame];
    for (int i = 0; i < pages; i++) {
        // Check to screenHeight if page draws more than the height of the UIWebView
        if ((i+1) * screenHeight  > height) {
            CGRect f = [webView frame];
            f.size.height -= (((i+1) * screenHeight) - height);
            [webView setFrame: f];
        }

        UIGraphicsBeginPDFPage();
        CGContextRef currentContext = UIGraphicsGetCurrentContext();
        //CGContextTranslateCTM(currentContext, 72, 72); // Translate for 1" margins


        [[[webView subviews] lastObject] setContentOffset:CGPointMake(0, screenHeight * i) animated:NO];
        [webView.layer renderInContext:currentContext];
    }

    UIGraphicsEndPDFContext();

    // instructs the mutable data object to write its context to a file on disk
    [pdfData writeToFile:self.PDFpath atomically:YES];
    [webView setFrame:frame];

有人对此有所了解吗？

Answer 1

好的，我明白了。我上面使用的代码不是来自UIWebView的每个页面的4个部分，而是将它们打印为PDF作为图像。所以这些部分之间存在差距。

从HTML创建PDF时的白线（webview）

1 个答案: