如何将UIColor值转换为指定的颜色字符串？

Question

我需要将UIColor转换为颜色名称的NSString。

我想：

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

但colorString没有给@ “redColor”。

Answer 1

你想为此做什么？看看通用-desciption方法一开始

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

Answer 2

如何：

- (NSString *)stringForColor:(UIColor *)color { 
    CGColorRef c = color.CGColor; 
    const CGFloat *components = CGColorGetComponents(c); 
    size_t numberOfComponents = CGColorGetNumberOfComponents(c); 
    NSMutableString *s = [[[NSMutableString alloc] init] autorelease]; 
    [s appendString:@"{"]; 
    for (size_t i = 0; i < numberOfComponents; ++i) { 
     if (i > 0) { 
      [s appendString:@","]; 
     } 
     [s appendString:[NSString stringWithFormat:@"%f", components[i]]]; 
    } 
    [s appendString:@"}"]; 
    return s; 
} 

例如，stringForColor:[UIColor greenColor]有结果 “{} 0.000000,1.000000,0.000000,1.000000”。

Answer 3

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。

如果你想将字符串转换回的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]; 

你存储的UIColor对象作为核心数据的属性？如果是的话，我的回答看看这个问题：Core Data data model: attribute type for UIColor

Answer 4

的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-----------

如果您希望支持所有设备上面提到的将NSString转换为UIColor的方式不适用于所有设备。

---

stringRepresentation

返回一个格式化字符串指定颜色的成分。

字符串表示总是有四个组件 - 红色，绿色，蓝色和alpha。

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

---

colorWithString：

创建使用由字符串指定的RGBA颜色成分值的颜色对象。

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

Answer 5

NSString *colorString = (NSString *)YourColor; 

Answer 6

这是我用来从CGColor转换为NSString的#RRGGBBAA格式：

// Return the parsed core graphics color as a "#RRGGBBAA" string value 

+ (NSString*) cgColorToString:(CGColorRef)cgColorRef 
{ 
    const CGFloat *components = CGColorGetComponents(cgColorRef); 
    int red = (int)(components[0] * 255); 
    int green = (int)(components[1] * 255); 
    int blue = (int)(components[2] * 255); 
    int alpha = (int)(components[3] * 255); 
    return [NSString stringWithFormat:@"#%0.2X%0.2X%0.2X%0.2X", red, green, blue, alpha]; 
} 

Answer 7

这是的UIColor转换成的NSString的最短途径：

- (NSString *)stringFromColor:(UIColor *)color 
{ 
    const size_t totalComponents = CGColorGetNumberOfComponents(color.CGColor); 
    const CGFloat * components = CGColorGetComponents(color.CGColor); 
    return [NSString stringWithFormat:@"#%02X%02X%02X", 
      (int)(255 * components[MIN(0,totalComponents-2)]), 
      (int)(255 * components[MIN(1,totalComponents-2)]), 
      (int)(255 * components[MIN(2,totalComponents-2)])]; 
} 

Answer 8

试试这个。我problem.Might帮助你们也是最好的解决方案..

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