I would like to have an SKSpriteNode start to fall when the screen is not being tapped(like in flappy bird). I have SKActions that move the object up which are called in the touchesBegan method and I would like the object to fall until the next tap or it hits the ground.
trying setting your gravity in the game to
self.physicsWorld.gravity = CGVectorMake(0,-9.8);
and setting your SKSpriteNode to dynamic.
test.physicsbody.dynamic = YES;