Exception calling super in Objective-C class on Big Sur

Question

Created Jun ’20

Replies 2

Boosts 0

Participants 2

Thanks for the very informative session (Advancements in the Objective-C runtime).

I'm seeing an exception in a shipping app (FB7781503) on the WWDC20 Big Sur build when calling super from an NSLayoutManager subclass.

Code Block objective-c- (NSArray<NSRulerMarker *> *)rulerMarkersForTextView:(NSTextView *)aTextView paragraphStyle:(NSParagraphStyle *)paraStyle ruler:(NSRulerView *)aRulerView {
    NSArray <NSRulerMarker *> *markers = [super rulerMarkersForTextView:aTextView paragraphStyle:paraStyle ruler:aRulerView];
		...
}

The layout manager instance data doesn't seem to have been corrupted prior to calling super, but calling super throws

Code Block -[STLayoutManager rulerMarkersForTextView:paragraphStyle:ruler:]: unrecognized selector sent to instance 0x7fce12e697b0

I'm wondering if the runtime changes are the cause. I'm able to reproduce this. Any tips for debugging this one?

Steve

Boost

Answer 1

Frameworks Engineer OP

Apple

Jun ’20

This looks like a bug. Please file a report. Thank you.

0

Answer 2

sjs OP

Jun ’20

Thanks. The Feedback Assistant id is in the original post. FB7781503

Steve

0