Swift implementation of rainbow gradient

Thank you for your support and attention. I was flattered by the rapid increase in access volume as soon as Web color's swfit implementation was published.

To express gratitude, the Rainbow gradient was also achieved this morning.

Latest code & Related Materials: https://github.com/duzixi/RainbowColors-with-Swift (continuous maintenance)

Generate a function prototype:

• Func rainbowcolor (X: Float)-> uicolor

Value range:

X: 0 ~ 256*5-1

Example of generating gradient of all rainbow colors:

Class viewcontroller: uiviewcontroller {override func viewdidload () {super. viewdidload () // do any additional setup after loading the view, typically from a nib. let viewheight: Float = float (self. view. frame. size. height) Let viewwidth: Float = float (self. view. frame. size. width) // create all rainbow colors let Inc: Float = 256*5/viewheight; For (var I: Float = 0.0; I <256*5; I ++ = Inc) {Let view = uiview (); view. frame = cgrectmake (0, 0 + I/INC, viewwidth, 1); view. backgroundcolor = rainbowcolor (I); // <---- call the rainbow gradient function. The parameter must be float self. view. addsubview (View) ;}} override func didreceivememorywarning () {super. didreceivememorywarning () // dispose of any resources that can be recreated .}}

Program execution:

Source code reference:

(Note: The following Source Code may not be up-to-date. For the latest source code, click the link above this article .)

<Span style = "font-family: Arial; font-size: 14px;"> // rainbowcolor. swift /// created by Du Zi Jun on 14-6-29. // copyright (c) 2014 lanou. all rights reserved. // import uikit // X: 0 ~ 256*5-1 func rainbowcolor (X: Float)-> uicolor {var unit: Float = 256 var R: Float = 0, G: Float = 0, B: float = 0 if (0 <= x & x <Unit) {// red-> orange-> yellow R = unit-1g = x} else if (x <Unit * 2) {// yellow-> green r = unit-1-x % Unit G = unit-1} else if (x <Unit * 3) {// green-> Green G = unit-1-x % unit/2 B = x % unit} else if (x <Unit * 4) {// blue-> Blue G = unit/2-1-x % unit/2 B = unit-1} else if (x <Unit * 5) {// blue-> purple r = x % Unit B = unit-1} return uicolor (RED: R/(unit-1), Green: g/(unit-1), blue: B/(unit-1), alpha: 1.0)} </span>

Program BUG:

Debugging environment: xcode6 Beta

There is no problem with the 4s and 5 simulators. The operator error will be prompted during the 5S test.

This is probably a data type issue. However, if debugging is not successful for any reason, please kindly advise.