밤이나 너무 밝은 곳에서는 앱이 너무 밝거나 어두운 경우가 생긴다. 터치값 보고 위아래 움직이는 정도에 따라 밝기 조절. - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{ UITouch *touch = [touches anyObject]; CGPoint location = [touch locationInView:[touch view]]; previousPoint = location.y; } - (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{ UITouch *touch = [touches anyObject]; CGPoint location = [touch locationIn..