HTML网页导出PDF文件

HTMLToPDF.m

- (void)htmlExpectToPDF{
    UIViewPrintFormatter *viewPrintFormatter = [self.webView viewPrintFormatter];
    viewPrintFormatter.startPage = 0;
    
    UIPrintPageRenderer *pageRender = [[UIPrintPageRenderer alloc] init];
    [pageRender addPrintFormatter:viewPrintFormatter startingAtPageAtIndex:0];
    
    
    CGRect page;
    page.origin.x=0;
    page.origin.y=0;
    page.size.width=600;
    page.size.height=768;
    CGRect printable=CGRectInset( page, 10, 10 );
    [pageRender setValue:[NSValue valueWithCGRect:page] forKey:@"paperRect"];
    [pageRender setValue:[NSValue valueWithCGRect:printable] forKey:@"printableRect"];
    
    
    NSMutableData *pdfData = [NSMutableData data];
    UIGraphicsBeginPDFContextToData(pdfData, CGRectZero, nil);
    for (int i = 0; i < pageRender.numberOfPages; i++) {
        UIGraphicsBeginPDFPage();
        CGRect bounds =UIGraphicsGetPDFContextBounds();
        [pageRender drawPageAtIndex:i inRect:bounds];
    }
    UIGraphicsEndPDFContext();

    NSString *docPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
    NSString *txtPath = [docPath stringByAppendingPathComponent:@"objc.pdf"]; // 此时仅存在路径，文件并没有真实存在
    [pdfData writeToFile:txtPath atomically:YES];
    
}