您可以
stride(through:, by:)为此使用跨步功能..类似
for hue in (minHue).stride(through: maxHue, by: hueIncrement){ // ...}在中
Swift3.0，您可以使用
stride(from:to:by:)或
stride(from:through:by:)语法
for hue in stride(from: minHue, through: maxHue, by: hueIncrement){ //....}
