//str：要改變的字 //result：整個label里的字 //color: 字的顏色- (NSMutableAttributedString *)changeSomeText:(NSString *)str inText:(NSString *)result withColor:(UIColor *)color {  NSMutableAttributedString *attributeStr = [[NSMutableAttributedString alloc] initWithString:result];  NSRange colorRange = NSMakeRange([[attributeStr string] rangeOfString:str].location,[[attributeStr string] rangeOfString:str].length);  [attributeStr addAttribute:NSForegroundColorAttributeName value:color range:colorRange];  return attributeStr;}