Learning Swift™ Programming

Hardcore Mode

Players will eventually become familiar with the speed of the obstacles. With a bit of practice, they’ll figure out the timing and rack up dozens of points. You want to provide more a challenge. For every 5 points a player scores, you should add 1 to the groundSpeed. The modulus operator provides a convenient way to keep count:

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if ((self.score % 5) == 0) {    self.groundSpeed++}

Reading aloud, you can pronounce the percentage sign as “modulo” or use the colloquial term “mod.” In this case, score mod 5 returns a 0 only when score is a multiple of 5. After you update the integer, display it by updating the text property of self.scoreText.

There’s one final task to accomplish in the blockRunner method. ...