Example patch master usage ( https://opensource.plausible.coop/src/projects/XC/repos/excode-plugin/browse/eXcode/EXPatchMaster.m?until=618f5fc0c2cbe5f4d8027d49ea61afddeb864a6e )

EXPatchMasterExample.m

    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        [NSWindow ex_patchInstanceSelector: @selector(sendEvent:) withReplacementBlock: ^(EXPatchIMP *patch, NSEvent *event) {
            NSWindow *window = (__bridge NSWindow *) patch->self;
            if (window != self.window && [event type] == NSLeftMouseUp && [window isKeyWindow]) {
                /* The last view seen */
                static NSView *lastView = nil;
                                
                NSPoint point = [window.contentView convertPoint: [event locationInWindow] fromView: nil];
                NSView *hitView = [window.contentView hitTest: point];

                /* Only send a notification when the view changes */
                if (hitView != nil && hitView != lastView) {
                    lastView = hitView;
                    [[NSNotificationCenter defaultCenter] postNotificationName: EXViewAnalyzerTargetedViewNotification object: hitView];
                }
            }
            
            EXPatchIMPFoward(patch, void (*)(id, SEL, NSEvent *), event);
        }];
    });