(IOS)设置textView的某段文字变成其他颜色

 - (void)setupTextView:(UITextView *)textView text:(NSString *)text color:(UIColor *)color {

        NSMutableAttributedString *string = [[NSMutableAttributedString alloc]initWithString:textView.text];

        [string addAttribute:NSForegroundColorAttributeName value:color range:[textView.text rangeOfString:text]];

        [textView setAttributedText:string];

    }