【注释】手绘注释状态下，点击页面上已添加的超链接，右侧会显示一个黑色框

PDF Office/PDF Master/Class/PDFWindowController/PDFListView/CPDFListViewExtension/CPDFListView+Tool.m

@@ -522,15 +522,17 @@
 }
 
 - (void)showHUDHint:(CPDFAnnotation *)newActiveAnnotation {
-    CPDFListHoverAnnotationViewController *popViewController = [[CPDFListHoverAnnotationViewController alloc] initWithNibName:@"CPDFListHoverAnnotationViewController" bundle:[NSBundle mainBundle] annotation:newActiveAnnotation];
-    self.hoverPopOver = [[NSPopover alloc] init];
-    self.hoverPopOver.contentViewController = popViewController;
-    self.hoverPopOver.animates = NO;
-    self.hoverPopOver.behavior = NSPopoverBehaviorSemitransient;
-    self.hoverPopOver.backgroundColor = [NSColor colorWithRed:0 green:0 blue:0 alpha:0.8];
-    self.hoverPopOver.contentSize = popViewController.view.frame.size;
-     CGRect rect = [self convertRect:newActiveAnnotation.bounds fromPage:newActiveAnnotation.page];
-    [self.hoverPopOver showRelativeToRect:CGRectMake(rect.origin.x + 10, rect.origin.y, rect.size.width, rect.size.height) ofView:self preferredEdge:NSRectEdgeMaxX];
+    CGRect rect = [self convertRect:newActiveAnnotation.bounds fromPage:newActiveAnnotation.page];
+    if (rect.size.width != 0 && rect.size.height != 0) {
+        CPDFListHoverAnnotationViewController *popViewController = [[CPDFListHoverAnnotationViewController alloc] initWithNibName:@"CPDFListHoverAnnotationViewController" bundle:[NSBundle mainBundle] annotation:newActiveAnnotation];
+        self.hoverPopOver = [[NSPopover alloc] init];
+        self.hoverPopOver.contentViewController = popViewController;
+        self.hoverPopOver.animates = NO;
+        self.hoverPopOver.behavior = NSPopoverBehaviorSemitransient;
+        self.hoverPopOver.backgroundColor = [NSColor colorWithRed:0 green:0 blue:0 alpha:0.8];
+        self.hoverPopOver.contentSize = popViewController.view.frame.size;
+        [self.hoverPopOver showRelativeToRect:CGRectMake(rect.origin.x + 10, rect.origin.y, rect.size.width, rect.size.height) ofView:self preferredEdge:NSRectEdgeMaxX];
+    }
 }
 
 - (void)hidenHUDHint {