UIBarButtonItem *rightBarItem = [[UIBarButtonItem alloc] initWithTitle:@"任务" style:UIBarButtonItemStylePlain target:self action:@selector(clickRightBarItem)];
    [rightBarItem setTintColor:[UIColor blackColor]];
    [rightBarItem setTitleTextAttributes:@{
                  //1.设置字体样式:例如黑体,和字体大小
                  NSFontAttributeName:[UIFont fontWithName:@"Arial-BoldMT" size:15],
                  //2.设置段落样式
                  NSParagraphStyleAttributeName:[NSParagraphStyle defaultParagraphStyle],
                  //3.设置文字颜色
                  NSForegroundColorAttributeName:[UIColor redColor],
                  //4.设置背景颜色
                  NSBackgroundColorAttributeName:[UIColor greenColor]
                                           }forState:(UIControlStateNormal)];