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可用類別寫一個 方便使用

+ (uicolor *) colorwithhexstring: (nsstring *)color

{

nsstring *cstring = [[colorstringbytrimmingcharactersinset:[nscharactersetwhitespaceandnewlinecharacterset]] uppercasestring];

// string should be 6 or 8 characters

if ([cstring length] <6) {

return [uicolorclearcolor];

}

// strip 0x if it appears

if ([cstring hasprefix:@0x])

cstring = [cstringsubstringfromindex:2];

if ([cstring hasprefix:@#])

cstring = [cstringsubstringfromindex:1];

if ([cstring length] !=6)

return [uicolorclearcolor];

// 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;

[[nsscannerscannerwithstring:rstring] scanhexint:&r];

[[nsscannerscannerwithstring:gstring] scanhexint:&g];

[[nsscannerscannerwithstring:bstring] scanhexint:&b];

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

}

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