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];