iOS 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(0, 0, 50, 40)];
[actionNewButton setTitle:@"测试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:@"测试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;