可用类别写一个 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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