ios富文本功能/文字特性设置

 // 将“文字”二字放大变成红色
    
    NSString * AllStr = @"这是个测试文字";
    NSRange  WZRange = NSMakeRange(5, 2);
    
    NSMutableAttributedString * wantStr = [[NSMutableAttributedString alloc] initWithString:AllStr];
    [wantStr addAttribute:NSFontAttributeName value:[UIFont systemFontOfSize:20] range:WZRange];
    [wantStr addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:WZRange];
    
    UILabel * label = [[UILabel alloc] initWithFrame:CGRectMake(50, 80, 150, 50)];
    label.textColor = [UIColor blackColor];
    label.font = [UIFont systemFontOfSize:12];
    label.attributedText = wantStr;
    [self.view addSubview:label];

   运行效果如下