Cocoa/Obj-C - Open file when dragging it to application icon

Question

Currently there is a button on my app inteface which allow to open a file, here is my open code:

In my app.h:

- (IBAction)selectFile:(id)sender;
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Answer 1

for a quick&dirty solution:

Cocoa: Drag and Drop any file type

Tested under Xcode Version 11.4 (11E146) catalina 10.15.4 (19E266)