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PdfDocument.FindAsync method overloads all return void, rather than Task
They return Task? :D
These methods are not actually C# async/await methods. They're bindings for
- (void)beginFindStrings:(NSArray<NSString *> *)strings
FindAsync simply triggers the asynchronous search for strings. Notifications are issued after that when things are happening. From the documentation (https://developer.apple.com/documentation/pdfkit/pdfdocument/1436096-beginfindstrings?language=objc):
"This method returns immediately. It causes notifications to be issued when searching begins and ends, on each search hit, and when the search proceeds to a new page. For options, refer to Searching, Comparing, and Sorting Strings."