iOS8 自定义navigationItem.titleView

navigationBar其实有三个子视图，leftBarButtonItem，rightBarButtonItem，以及titleView。前两种的自定义请参考http://www.cnblogs.com/6duxz/p/4030916.html

titleView的自定义就更简单了，把它看成一个视图，替换或者添加子视图都可以。以下我在titleView添加了两个button

UIButton* actionNewButton = [[UIButton alloc]initWithFrame:CGRectMake(, , , )];
    [actionNewButton setTitle:@"测试1" forState:UIControlStateNormal];
    actionNewButton.tag=;
    [actionNewButton setTitleColor:[UIColor colorWithRed:0.1 green:0.63 blue:0.96 alpha:0.93] forState:UIControlStateNormal];
    //actionNewButton.backgroundColor=[UIColor grayColor];

    UIButton* classicAction = [[UIButton alloc]initWithFrame:CGRectMake(, , , )];
    [classicAction setTitle:@"测试2" forState:UIControlStateNormal];
    classicAction.tag=;
    [classicAction setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
    //classicAction.backgroundColor=[UIColor blueColor];

    UIView* titleView = [[UIView alloc]initWithFrame:CGRectMake(, , , )];
    //titleView.backgroundColor=[UIColor redColor];
    [titleView addSubview:actionNewButton];
    [titleView addSubview:classicAction];

    self.navigationItem.titleView=titleView;