局部富文本

  UILabel *testLabel = [[UILabel alloc]initWithFrame:CGRectMake(0, 100, 320, 30)];

  testLabel.backgroundColor = [UIColor lightGrayColor];

  testLabel.textAlignment = NSTextAlignmentCenter;

  NSMutableAttributedString *AttributedStr = [[NSMutableAttributedString alloc]initWithString:@"今天天气不错呀"];

  [AttributedStr addAttribute:NSFontAttributeName

                        value:[UIFont systemFontOfSize:16.0]

                        range:NSMakeRange(2, 2)];

  [AttributedStr addAttribute:NSForegroundColorAttributeName

                        value:[UIColor redColor]

                        range:NSMakeRange(2, 2)];

  testLabel.attributedText = AttributedStr;

  [self.view addSubview:testLabel];