這里是Demo鏈接: https://github.com/ironCheng/iFill 代碼里面有相應(yīng)的注釋,這里懶得寫了,有不明白的可以留言。 參考: https://ilearnios.wordpress.com/2013/07/18/scanline-flood-fill-algorithm-with-or-without-tolerance-in-objective-c/