UILabel上的文字 单独改变 属性

    UILabel *label1 = [[UILabel alloc]initWithFrame:CGRectMake(0.065*UIScreenSize.width, backBtn.frame.origin.y + backBtn.frame.size.height, UIScreenSize.width - 0.12*UIScreenSize.width, 0.14*UIScreenSize.height)];
    label1.numberOfLines = 0;
    label1.font = [UIFont boldSystemFontOfSize:14];
    NSMutableAttributedString *str = [[NSMutableAttributedString alloc]initWithString:@"请慎用加息卡，加息期间账户所有资金（包括新的投资资金）将被冻结，都不可提现，直至加息卡使用结束。"];
    [str addAttribute:NSForegroundColorAttributeName value:[UIColor whiteColor] range:NSMakeRange(0, str.length)];
    [str addAttribute:NSForegroundColorAttributeName value:[UIColor yellowColor] range:NSMakeRange(33, 4)];
    label1.attributedText = str;
    
    [navUI addSubview:label1];

效果图如下：