iOS recognition 16 binary color Table method

+ (Uicolor *) colorwithhexstring: (NSString *) color alpha: (cgfloat) Alpha

{

Delete spaces in a string

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 it starts with 0x, then the string is truncated, and the string starts at the position indexed to 2, up to the end

if ([cString hasprefix:@ "0X"])

{

cString = [cString substringfromindex:2];

}

If it starts with #, then the string is truncated, and the string starts at the position indexed to 1, up to the end

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:alpha];

}

The default alpha value is 1

+ (Uicolor *) colorwithhexstring: (NSString *) color

{

return [self colorwithhexstring:color alpha:1.0f];

}

iOS recognition 16 binary color Table method