iOS 随即颜色

直接调用方法即可 ：

-(UIColor *) randomColor

{

   CGFloat hue = ( arc4random() %256 / 256.0 );//0.0 to 1.0

   CGFloat saturation = ( arc4random() % 128 / 256.0 ) + 0.5; // 0.5 to 1.0,away from white

   CGFloat brightness = ( arc4random() % 128 / 256.0 ) + 0.5; //0.5 to 1.0,away from black

   return [UIColorcolorWithHue:hue saturation:saturationbrightness:brightness alpha:1];

}