UIPrintPageRenderer将网页转为PDF文件

渲染PDF

首先UIPrintPageRender添加创建data的分类
关联需要渲染的对象
调用方法渲染，返回NSData

1.首先UIPrintPageRender添加创建data的分类

@implementation UIPrintPageRenderer (LBPDF)

- (NSData*) printToPDF {
    NSMutableData *pdfData = [NSMutableData data];
    UIGraphicsBeginPDFContextToData( pdfData, self.paperRect, nil );
    [self prepareForDrawingPages: NSMakeRange(0, self.numberOfPages)];
    CGRect bounds = UIGraphicsGetPDFContextBounds();
    for ( int i = 0 ; i < self.numberOfPages ; i++ ) {
        UIGraphicsBeginPDFPage();
        [self drawPageAtIndex: i inRect: bounds];
    }
    UIGraphicsEndPDFContext();
    return pdfData;
}
@end

2. 关联需要渲染的对象 ，3. 调用方法渲染，返回NSData

- (void)builderPDFView{
    UIPrintPageRenderer *render = [[UIPrintPageRenderer alloc] init];
    [render addPrintFormatter:self.questionWebView.viewPrintFormatter startingAtPageAtIndex:0];//关联对象
    NSUInteger contentHeight = self.questionWebView.scrollView.contentSize.height;
    NSUInteger contentWidth = self.questionWebView.scrollView.contentSize.width;
    CGSize contentSize = CGSizeMake(contentWidth, contentHeight);
    //  需要打印的frame
    CGRect printableRect = CGRectMake(0,
                                      100,
                                      contentSize.width,
                                      contentSize.height/5);
    // 纸张的规格(标准PDF格式)
    CGRect paperRect = CGRectMake(0, 0, 595.2, 841.8);
    [render setValue:[NSValue valueWithCGRect:paperRect] forKey:@"paperRect"]; //因为是readonly属性，所以我们只能用KVC 进行赋值
    //设置pdf边距
    [render setValue:[NSValue valueWithCGRect:CGRectInset(paperRect, 10, 10)] forKey:@"printableRect"];
    NSData *pdfData = [render printToPDF];
    NSString *fileUrl = [NSString stringWithFormat:@"%@temp.pdf",NSTemporaryDirectory()];
    [pdfData writeToFile:fileUrl atomically: YES];
    
    NSFileManager *fileManager = [NSFileManager defaultManager];
    if ([fileManager fileExistsAtPath:fileUrl]) {
        NSLog(@"本地存在");
    }
    NSURL *fileUrlPath = [NSURL fileURLWithPath:fileUrl];
    NSString*textToShare =@"要分享的文本内容";
    NSArray*activityItems =@[fileUrlPath];

    UIActivityViewController *activityVC = [[UIActivityViewController alloc]initWithActivityItems:activityItems applicationActivities:nil];

    [self.weakVC presentViewController: activityVC animated:YES completion:nil];
}