Hooking an optional delegate method that isn't implemented

[avnerbarr]

Basically I want to add aspects to a datasource/delegate of a UITableView. Obviously UITableView has lots of optional callbacks.

In many of my use cases the data source/delegate doesn't implement the optional methods, but I still need a way to forward the table view calls to my hooks.

In this example I need to return a different height for certain cells but I get an error "AspectErrorDoesNotRespondToSelector".

token = [object
           aspect_hookSelector:@selector(tableView:heightForRowAtIndexPath:)
           withOptions:AspectPositionInstead
           usingBlock:^(id <AspectInfo> info,UITableView *tableView,NSIndexPath *indexPath) {
                  // replace the original implementation with different calculation
                  // object doesn't implement the method...
                  // hook fails :(
             }error:&error];

Any suggestion how to go about adding the method dynamically to the class and then hooking?

Thanks

[allewun]

I'm running into the exact same scenario, with the added wrinkle of using Swift. Any advice would be greatly appreciated!

[will0321]

@avnerbarr I have the same problem. Have you solved it？

[avnerbarr]

You would need to add the method at runtime to the delegate class and then hook it. Which version of the library are you using? Perhaps this feature was added?