objective c - How to check if Option key is down when user clicks a NSButton -


i have few checkboxes along textfields on nspanel opens user parameters. option, i'd user able set/unset checkboxes on panel holding option key when press of checkboxes.

i'm not sure where/how check key board doing when user clicks button.

check [nsevent modifierflags]...

if ([nsevent modifierflags ] & nsalternatekeymask) {     //do }

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