我在做这样的事情：
- (NSArray*)colors {
float divisor = .3333;
NSMutableArray *retVal = [NSMutableArray array];
for (float one=0; one <= 1.0f; one += divisor) {
for (float two = 0; two <= 1.0f; two += divisor) {
for (float three = 0; three <= 1.0f; three += divisor) {
UIColor *color = [UIColor colorWithRed:one green:two blue:three alpha:.5];
// also bad
// UIColor *color = [UIColor colorWithHue:one saturation:two brightness:three alpha:.5];
[retVal addobject:color];
}
}
}
return retVal;
}
正如我所怀疑的那样,这些颜色出乎意料地出现了(眼中).红色不带红色,紫色不用紫色等.
有没有简单的方法来创建不同颜色的列表,根据人类标准,“看起来很蓝色”很好地分组.
解决方法
这工作得很好.它不会帮助你有很多重复的颜色的事实.见下文：
NSArray *sorted = [[dict allValues] sortedArrayUsingComparator:^NSComparisonResult(UIColor* obj1,UIColor* obj2) {
float hue,saturation,brightness,alpha;
[obj1 getHue:&hue saturation:&saturation brightness:&brightness alpha:&alpha];
float hue2,saturation2,brightness2,alpha2;
[obj2 getHue:&hue2 saturation:&saturation2 brightness:&brightness2 alpha:&alpha2];
if (hue < hue2)
return NSOrderedAscending;
else if (hue > hue2)
return NSOrderedDescending;
if (saturation < saturation2)
return NSOrderedAscending;
else if (saturation > saturation2)
return NSOrderedDescending;
if (brightness < brightness2)
return NSOrderedAscending;
else if (brightness > brightness2)
return NSOrderedDescending;
return NSOrderedSame;
}];
您可以在iOS 4.x中访问这些组件(HSBA)：
CGFloat *components = (CGFloat *)CGColorGetComponents([color CGColor]);
float hue = components[0];
float saturation = components[1]; // etc. etc.
为了避免重复颜色：您可以将元素放在NSMutableDictionary中,键入类似于它们的色相饱和度亮度(每个四舍五入到最接近的.10)…然后从THAT获得数组,然后进行排序.