NSMutableAttributedString

设置不同颜色

NSMutableAttributedString *attributedStr = [[NSMutableAttributedString alloc] initWithString:[NSString stringWithFormat:@"您将发送付费消息，%ld%@/条", self.inImModel.coin, [UserService getName_Coin]]];
    // 给对应的range添加属性
[attributedStr addAttributes:@{NSForegroundColorAttributeName : k_Color_FFB300} range:NSMakeRange(9, attributedStr.length - 9)];
payView.messageLabel.attributedText = attributedStr;