ios客户端学习－颜色将16位值转换成rgb值,UIColor与字符串互转

#define UIColorFromRGB(rgbValue) [UIColor colorWithRed:((float)((rgbValue &
0xFF0000) >> 16))/255.0 green:((float)((rgbValue &0xFF00) >>8))/255.0 blue:((float)(rgbValue
&0xFF))/255.0 alpha:1.0]

用法：

self.btnWork.backgroundColor =UIColorFromRGB(0x1874de);

其他链接：https://github.com/zhangxigithub/ZXMacro/blob/master/ZXMacro.h

2。将16进制字符串转换成uicolor
注：参数值不带＃号

// 将16进制字符串转换成uicolor
+(UIColor*)toUIColorByStr:(NSString*)colorStr{

    

    NSString *cString = [[colorStr
stringByTrimmingCharactersInSet:[NSCharacterSet
whitespaceAndNewlineCharacterSet]] uppercaseString];
   
if ([cString hasPrefix:@"#"]) cString = [cString
substringFromIndex:1];
   
if ([cString length] !=
6) return [UIColor
blackColor];

    

    // Separate into r, g, b substrings
   
NSRange range;
    range.location =
0;
    range.length =
2;
   
NSString *rString = [cString
substringWithRange:range];
    range.location =
2;
   
NSString *gString = [cString
substringWithRange:range];
    range.location =
4;
   
NSString *bString = [cString
substringWithRange:range];

    // Scan values
   
unsigned int r, g, b;

    

    [[NSScanner
scannerWithString:rString] scanHexInt:&r];

    [[NSScanner
scannerWithString:gString] scanHexInt:&g];

    [[NSScanner
scannerWithString:bString] scanHexInt:&b];

    
   
return [UIColor
colorWithRed:((float) r /
255.0f)
                          
green:((float) g /
255.0f)
                           
blue:((float) b /
255.0f)
                          
alpha:1.0f];
}

3.将UIColor转换成16进制字符串

// 注意转换出来的字符串不带＃号
+(NSString*)toStrByUIColor:(UIColor*)color{
   
CGFloat r, g, b, a;
    [color
getRed:&r green:&g
blue:&b alpha:&a];
   
int rgb = (int) (r *
255.0f)<<16 | (int) (g *
255.0f)<<8 | (int) (b *
255.0f)<<0;

    return [NSString
stringWithFormat:@"%06x", rgb];
}