Question

我想生成一个带有文本的pdf文件，该文件每次都会根据我的服务器数据进行更改。我想在iOS中使用html创建该pdf文件。有什么建议。请帮忙。

提前致谢。

Answer 1

请查看以下链接：

它有使用本地html文件和URL的方法。

+ (id)createPDFWithHTML:(NSString*)HTML pathForPDF:(NSString*)PDFpath delegate:(id <NDHTMLtoPDFDelegate>)delegate pageSize:(CGSize)pageSize margins:(UIEdgeInsets)pageMargins;
+ (id)createPDFWithHTML:(NSString*)HTML baseURL:(NSURL*)baseURL pathForPDF:(NSString*)PDFpath delegate:(id <NDHTMLtoPDFDelegate>)delegate pageSize:(CGSize)pageSize margins:(UIEdgeInsets)pageMargins;
+ (id)createPDFWithHTML:(NSString*)HTML pathForPDF:(NSString*)PDFpath pageSize:(CGSize)pageSize margins:(UIEdgeInsets)pageMargins successBlock:(NDHTMLtoPDFCompletionBlock)successBlock errorBlock:(NDHTMLtoPDFCompletionBlock)errorBlock;
+ (id)createPDFWithHTML:(NSString*)HTML baseURL:(NSURL*)baseURL pathForPDF:(NSString*)PDFpath pageSize:(CGSize)pageSize margins:(UIEdgeInsets)pageMargins successBlock:(NDHTMLtoPDFCompletionBlock)successBlock errorBlock:(NDHTMLtoPDFCompletionBlock)errorBlock;

Answer 2

你可以试试这个：

您需要在webview上显示此内容

-(IBAction)convertPDF:(id)sender { 
webViewHeight = [[self.myWebView stringByEvaluatingJavaScriptFromString:@"document.body.scrollHeight;"] integerValue];

    CGRect screenRect = self.myWebView.frame;

    double currentWebViewHeight = webViewHeight;
    while (currentWebViewHeight > 0)
    {
        imageName ++;

        UIGraphicsBeginImageContext(screenRect.size);

        CGContextRef ctx = UIGraphicsGetCurrentContext();
        [[UIColor blackColor] set];
        CGContextFillRect(ctx, screenRect);

        [self.myWebView.layer renderInContext:ctx];

        UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();

        UIGraphicsEndImageContext();

        NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
        NSString *documentsDirectory = [paths objectAtIndex:0];
        NSString *pngPath = [documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:@"%d.png",imageName]];

        if(currentWebViewHeight < 960)
        {
            CGRect lastImageRect = CGRectMake(0, 960 - currentWebViewHeight, self.myWebView.frame.size.width, currentWebViewHeight);
            CGImageRef lastImageRef = CGImageCreateWithImageInRect([newImage CGImage], lastImageRect);                
            newImage = [UIImage imageWithCGImage:lastImageRef]; 
            CGImageRelease(lastImageRef);
        }

        [UIImagePNGRepresentation(newImage) writeToFile:pngPath atomically:YES];

        [self.myWebView stringByEvaluatingJavaScriptFromString:@"window.scrollBy(0,960);"];
        currentWebViewHeight -= 960;
    }
    [self drawPdf];
}

然后从webview中提取PDF

 - (void) drawPdf
{ CGSize pageSize = CGSizeMake(612, webViewHeight);
NSString *fileName = @"Demo.pdf";
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *pdfFileName = [documentsDirectory stringByAppendingPathComponent:fileName];

UIGraphicsBeginPDFContextToFile(pdfFileName, CGRectZero, nil);

// Mark the beginning of a new page.
UIGraphicsBeginPDFPageWithInfo(CGRectMake(0, 0, pageSize.width, pageSize.height), nil);

double currentHeight = 0.0;

for (int index = 1; index <= imageName ; index++)
{
    NSString *pngPath = [documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:@"%d.png", index]];
    UIImage *pngImage = [UIImage imageWithContentsOfFile:pngPath];

    [pngImage drawInRect:CGRectMake(0, currentHeight, pageSize.width, pngImage.size.height)];        
    currentHeight += pngImage.size.height;
}

UIGraphicsEndPDFContext(); }

在viewDidLoad

中

- (void)viewDidLoad
{
[super viewDidLoad];
NSString *path;
NSBundle *bundle = [NSBundle mainBundle];
path = [bundle pathForResource:@"Demo" ofType:@"html"];

NSURL *fileUrl = [NSURL URLWithString:@"https://www.google.com/sites/overview.html"];
[self.myWebView loadRequest:[NSURLRequest requestWithURL:fileUrl]];
}

如何在iOS中使用html创建pdf文件

2 个答案: