16进制颜色转化成UIColor

在项目中美工设计标注的文字颜色往往是十六进制的形式，如#f2f2f2等，这无法直接使用在工程中，需要转换，方法如下:

+ (UIColor *) colorWithHexString: (NSString *)color
{

    NSString *cString = [[color
stringByTrimmingCharactersInSet:[NSCharacterSet
whitespaceAndNewlineCharacterSet]] uppercaseString];

    

    // String should be 6 or 8 characters
   
if ([cString length] <
6) {
       
return [UIColor
clearColor];
    }

    

    // strip 0X if it appears
   
if ([cString hasPrefix:@"0X"])
        cString = [cString
substringFromIndex:2];
   
if ([cString hasPrefix:@"#"])
        cString = [cString
substringFromIndex:1];
   
if ([cString length] !=
6)
       
return [UIColor
clearColor];

    

    // Separate into r, g, b substrings
   
NSRange range;
    range.location =
0;
    range.length =
2;

    
   
//r
   
NSString *rString = [cString
substringWithRange:range];

    
   
//g
    range.location =
2;
   
NSString *gString = [cString
substringWithRange:range];

    
   
//b
    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];
}
也可设置成宏的形式:

#define  Color_Hex16(C_String) [Color_Process colorWithHexString:C_String]