改变rightBarButtonItem字体的大小

改变rightBarButtonItem字体的大小   

 self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"发布" style:UIBarButtonItemStylePlain target:self action:@selector(rightAction)];

    [self.navigationItem.rightBarButtonItem setTintColor:MainColor];

    [self.navigationItem.rightBarButtonItem setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:KFont_13, NSFontAttributeName, nil] forState:UIControlStateNormal];