如何设置label上面的文字显示不同颜色

//设置颜色属性和字体属性-(NSAttributedString*)illuminatedString:(NSString*)textfont:(UIFont*)AtFont{intlen=[textlength];//创建一个可变的属性字符串NSMutableAttributedString*mutaString=[[[NSMutableAttributedStringalloc]initWithString:text]autorelease];//改变字符串从1位长度为1这一段的前景色，即字的颜色。[mutaStringaddAttribute:(NSString*)(kCTForegroundColorAttributeName)value:(id)self.stringColor.CGColorrange:NSMakeRange(0,len)];if(self.keywordColor!=nil){for(NSValue*valueinlist){//NSValue*value=[listobjectAtIndex:i];NSRangekeyRange=[valuerangeValue];[mutaStringaddAttribute:(NSString*)(kCTForegroundColorAttributeName)value:(id)self.keywordColor.CGColorrange:keyRange];}}