一、初始化
//初始化 并赋值
UISegmentedControl *segmentControl = [[UISegmentedControl alloc]initWithItems:@[@"头条",@"体育",@"新闻",@"科技",@"娱乐"]];
//给segmentControl一个位置 让它显示
segmentControl.frame = CGRectMake(0, 60, CGRectGetWidth([UIScreen mainScreen].bounds), 50);
[self.view addSubview:segmentControl];
二、清除掉边框颜色 此时会清除掉所有文字
segmentControl.tintColor = [UIColor clearColor];
三、先初始化字典 设置字体后 便解决了所有问题
NSDictionary *dicOne = @{NSFontAttributeName:[UIFont boldSystemFontOfSize:20],NSForegroundColorAttributeName:[UIColor blackColor]};
四、把字典的值 给segmentControl 注意 setTitleTextAttributes 需要一个字典
[segmentControl setTitleTextAttributes:dicOne forState:UIControlStateNormal];
五、选中状态同样
NSDictionary *dicTwo = @{NSFontAttributeName:[UIFont boldSystemFontOfSize:25],NSForegroundColorAttributeName:[UIColor redColor]};
[segmentControl setTitleTextAttributes:dicTwo forState:UIControlStateSelected];
去掉segMentedControl的边框和改变选中字体的样式
原文：http://www.cnblogs.com/ios-wanglong/p/5141052.html