如何阻止 PDFNet 操作执行？

Question

基本上，我正在尝试拦截对远程文件链接的点击，而是打开我已经存储的本地版本。

我能够在点击链接后执行该链接的操作，但我不知道如何在保持 URL 不变的同时阻止它执行默认行为。

以下是相关代码：

- (void)pdfScrollViewTap:(UITapGestureRecognizer *)gestureRecognizer
{

Annot *annotation;

@try {
    // If they are clicking an annotation, we don't want to process this
    [self.pdfView DocLockRead];
    CGPoint down = [gestureRecognizer locationInView:self.pdfView];
    annotation = [self.pdfView GetAnnotationAt:down.x y:down.y];
}
@catch (NSException *exception) {
    // something is wrong with the annotation, it may not be selected properly
}
@finally {
    [self.pdfView DocUnlockRead];
}

// This is how we find out a Link was tapped
if ([annotation IsValid]) {
    if (annotation.GetType == e_Link) { // Its a link
        Link *link = [[Link alloc] initWithAnn:annotation]; // here's the link
        Action *action = link.GetAction; // links have an action, heres that
        if ([action IsValid]) { // hopefully its valid
            if (action.GetType == e_URI) { // URI is the URL the link points to
                if ([self.delegate respondsToSelector:@selector(shouldOpenURLforLinkAnnotation:withViewController:)]) { // Check if the delegate implements this
                    NSString *origURL = [action.GetSDFObj FindObj:@"URI"].GetAsPDFText;
                    if (![self.delegate shouldOpenURLforLinkAnnotation:origURL withViewController:self]) {
                        // The delegate handles finding and opening the local file

                        // Find a away to disable or stop the action here

                    }
                }
            }
        }
    }
    return;
}
}

我试过简单地删除操作：

[link RemoveAction];

这是第一次工作，但正如预期的那样，该操作在删除后再也不会被调用。

Answer 1

链接操作由工具代码执行，它实现了所有用户交互功能，例如文本选择、表单填充、注释创建/编辑和链接跟踪。要自定义链接处理行为，您应该在 /Lib/src/PDFViewCtrlTools/Tools 中修改 AnnotEditTool.m 的源代码并编译 libTools.a 的新副本，相关代码部分是

else if( actionType == e_URI )
{
    Obj* sdfObj = [action GetSDFObj];
    Obj* uriObj = [sdfObj FindObj:@"URI"];

    if( uriObj != Nil )
    {
        NSString* uriDestination = [uriObj GetAsPDFText];

        // appends http if no scheme is present
        uriDestination = [Link GetNormalizedUrl:uriDestination];

        dispatch_after(dispatch_time(DISPATCH_TIME_NOW, 0.4 * NSEC_PER_SEC), dispatch_get_main_queue(), ^{
            [[UIApplication sharedApplication] openURL:[NSURL URLWithString: uriDestination]];
        });




        return YES;
    }
}

你会想做除openURL:以外的事情