比较Objective-C中的颜色 [英] Comparing colors in Objective-C

问题描述

我正在使用这段代码来确定是否有两个颜色是相同的，使用Objective-C编写的代码。两种颜色是等价的（目前用于调试目的）

  NSLog（@currentColor is％@，currentColor）; 
 NSLog（@Adjacent Color is％@，[[buttonArray objectAtIndex：1] backgroundColor]）; 
 NSLog（@％i，[[buttonArray objectAtIndex：1] backgroundColor] == currentColor）; 
  

我的控制台显示

  2009-10-20 00：27：10.814 colorGame [13588：207] currentColor是kCGColorSpaceModelRGB 0 0 1 1 
 2009-10-20 00：27：10.815 colorGame [13588：207]相邻颜色是kCGColorSpaceModelRGB 0 0 1 1 
 2009-10-20 00：27：10.815 colorGame [13588：207] 0 
  

如果问我可以发布更多的代码（我不知道是否真的有必要）。当前颜色最初定义为

  UIColor * currentColor; 
 
  $ b      我相信我只是做比较错误，并且可能有一些内置的方法可以比较颜色，我只是不知道。
解决方案
 
  @implementation UIColor（compare）
 
  - （BOOL）isEqualToColor：（UIColor *）otherColor 
 {
 return CGColorEqualToColor（self.CGColor，otherColor.CGColor）; 
} 
 
 @end 
  
请记住两种颜色看起来相同可能或可能不返回TRUE，因为组件保持为浮动，并且它们可能不同的值小于显示硬件可以解析的值。
 
 
 
请记住，如果它们在不同的颜色空间中定义，此方法将永远不会返回TRUE。
 
I'm trying to determine if two colors are equivalent, using code written in Objective-C.

I'm using this snippet of code to determine if the two colors are equivalent (currently for debugging purposes)
    NSLog(@"currentColor is %@", currentColor);
NSLog(@"Adjacent Color is %@",[[buttonArray objectAtIndex:1] backgroundColor]);
NSLog(@"%i",[[buttonArray objectAtIndex:1] backgroundColor]==currentColor);
My console is showing
2009-10-20 00:27:10.814 colorGame[13588:207] currentColor is kCGColorSpaceModelRGB 0 0 1 1 
2009-10-20 00:27:10.815 colorGame[13588:207] Adjacent Color is kCGColorSpaceModelRGB 0 0 1 1 
2009-10-20 00:27:10.815 colorGame[13588:207] 0
I can post more code if asked (I don't know if any more is really necessary). Current color was initially defined as
UIColor *currentColor;
if that is any help.

I'm fairly sure I'm just doing the compare wrong, and that there is probably some built-in method that can compare colors, that I'm just not aware of.
解决方案
@implementation UIColor (compare)

- (BOOL) isEqualToColor:(UIColor *) otherColor
{
return CGColorEqualToColor(self.CGColor, otherColor.CGColor);
}

@end
Keep in mind that two colors that look the same may or may not return TRUE, since the components are kept as floats and they may differ by a value that's less than the display hardware can resolve.

Also keep in mind that if they're defined in different color spaces, this method will never return TRUE.

                        
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