ForceTouch in macOS

var prevStage = 0 override func pressureChange(with event: NSEvent) { let curStage:Int = event.stage if event.pressureBehavior == NSPressureBehavior.primaryDeepClick,prevStage != curStage { switch (curStage,prevStage){ case (0,1): Swift.print("from idle to clickStage") case (1,0): Swift.print("from clickStage to idle") case (1,2): Swift.print("from clickStage to deepClickStage") case (2,1): Swift.print("from deepStage to clickStage") default: break;//isn't possible } Swift.print("stageChange") prevStage = curStage/*always set prevStage to curStage on stage change*/ } Swift.print("pressureChange") } 

/** * NOTE: calculates the entire range of the stage pressures so from stage 0 to 1 the pressure goes from 0 to 0.5 and from stage 1 to 2 the linear pressure goes from 0.5 to 1 this makes it easier to scale things in a linear fashion from 0 to 1 in the entire stage range */ var linearPressure:CGFloat{ if event.stage == 0 { return 0 }else if event.stage == 1{ return pressure / 2 }else /*if stage == 2*/ { return 0.5 + (pressure / 2) } }