如何将UIColor值转换为命名颜色字符串？

Question

我需要转换UIColor为NSString颜色名称.

我试过了:

 NSString *colorString = NSStringFromClass([[UIColor redColor] class]); 

但colorString没有给@"redColor".

Answer 1

在CIColor类中包含的颜色值和色空间,其颜色值都有效.

https://developer.apple.com/documentation/coreimage/cicolor

// UIColor to NSString
CGColorRef colorRef = [UIColor grayColor].CGColor;  
NSString *colorString = [CIColor colorWithCGColor:colorRef].stringRepresentation;

// NSString to UIColor 
CIColor *coreColor = [CIColor colorWithString:@"0.5 0.5 0.5 1.0"];  
UIColor *color = [UIColor colorWithCIColor:coreColor];

- - - - - - - - -警告 - - - - - -

如果你想支持所有设备上面提到的将NSString转换为UIColor的方法将不适用于所有设备.

stringRepresentation

返回指定颜色组件的格式化字符串.

字符串表示始终具有四个组件 - 红色,绿色,蓝色和alpha.

https://developer.apple.com/documentation/coreimage/cicolor/1437910-stringrepresentation

colorWithString:

使用由字符串指定的RGBA颜色分量值创建颜色对象.

https://developer.apple.com/documentation/coreimage/cicolor/1438059-colorwithstring

Answer 2

UIColor *color = value;
const CGFloat *components = CGColorGetComponents(color.CGColor);
NSString *colorAsString = [NSString stringWithFormat:@"%f,%f,%f,%f", components[0], components[1], components[2], components[3]];

完成.

如果要将字符串转换回UIColor对象:

NSArray *components = [colorAsString componentsSeparatedByString:@","];
CGFloat r = [[components objectAtIndex:0] floatValue];
CGFloat g = [[components objectAtIndex:1] floatValue];
CGFloat b = [[components objectAtIndex:2] floatValue];
CGFloat a = [[components objectAtIndex:3] floatValue];
UIColor *color = [UIColor colorWithRed:r green:g blue:b alpha:a];

您是否将UIColor对象存储为Core Data中的属性？如果是这样,请查看我对此问题的回答:核心数据数据模型:UIColor的属性类型

Answer 3

你想做什么的？看一下-desciption开始的通用方法

UIColor* someColor = ...//Initialize color
NSString* colorString = [someColor description];

Answer 4

试试这个 .我的问题的最佳解决方案.也可以帮助你们..

https://github.com/daniel-beard/DBColorNames