iOS8 自定義navigationItem.titleView

navigationBar其實有三個子視圖，leftBarButtonItem，rightBarButtonItem，以及titleView。前兩種的自定義請參考http://www.cnblogs.com/6duxz/p/4030916.html

titleView的自定義就更簡單了，把它看成一個視圖，替換或者添加子視圖都可以。以下我在titleView添加了兩個button

UIButton* actionNewButton = [[UIButton alloc]initWithFrame:CGRectMake(0, 0, 50, 40)];
    [actionNewButton setTitle:@"測試1" forState:UIControlStateNormal];
    actionNewButton.tag=0;
    [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(50, 0, 50, 40)];
    [classicAction setTitle:@"測試2" forState:UIControlStateNormal];
    classicAction.tag=1;
    [classicAction setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
    //classicAction.backgroundColor=[UIColor blueColor];
    
    UIView* titleView = [[UIView alloc]initWithFrame:CGRectMake(0, 0, 100, 40)];
    //titleView.backgroundColor=[UIColor redColor];
    [titleView addSubview:actionNewButton];
    [titleView addSubview:classicAction];
    
    self.navigationItem.titleView=titleView;