在 macOS 的 Cocoa 应用程序中，是否可以在选择更改期间收到通知，而不仅仅是在更改结束时收到通知？

Question

I would like to track the selection of a NSTextView continuously, but I only succeed to get the change when the selection finishes changing using:

- (void)textViewDidChangeSelection:(NSNotification *)notification {

}

Is there a way to track selection changes continuously? Any help is greatly appreciated. Thanks

Answer 1

I succeeded to solve the issue by subclassing NSTextView and overriding the following method:

-(void)setSelectedRanges:(NSArray<NSValue *> *)selectedRanges affinity:(NSSelectionAffinity)affinity stillSelecting:(BOOL)stillSelecting {

    [super setSelectedRanges:selectedRanges affinity:affinity stillSelecting:stillSelecting];

    if (stillSelecting && [self delegate] && [[self delegate] respondsToSelector:@selector(textViewDidChangeSelection:)]) {
        NSNotification *note = [[NSNotification alloc] initWithName:@"TextViewSelectionIsChangingNotification" object:self userInfo:nil];
        [[self delegate] textViewDidChangeSelection:note];
    }

}

This seems to me a good solution, it works well. Thanks.