关于自定义navigationItem，实现右侧多个按钮

废话不多说，直接正文，有时候我们想要在导航栏实现多个Item，所以就用到了UIToolBar。

navigationItem可以定义两个地方，rightBarButtonItem与leftBarButtonItem。

例如，我们要实现这个导航栏样式：

具体代码：

UIToolbar*tools=[[UIToolbar alloc]initWithFrame:CGRectMake(5, 0, 80, 39)];
    //解决出现的那条线
    tools.clipsToBounds = YES;
//解决tools背景颜色的问题
    [tools setBackgroundImage:[UIImage new]forToolbarPosition:UIBarPositionAny                      barMetrics:UIBarMetricsDefault];
    [tools setShadowImage:[UIImage new]
              forToolbarPosition:UIToolbarPositionAny];
//添加两个button
NSMutableArray*buttons=[[NSMutableArray alloc]initWithCapacity:2];
UIBarButtonItem*button3=[[UIBarButtonItem alloc]initWithImage:[UIImage imageNamed:@"你的图片"] style: UIBarButtonItemStyleDone target:self action:@selector(press2)];
    UIBarButtonItem*button2=[[UIBarButtonItem alloc]initWithImage:[UIImage imageNamed:@"你的图片"] style: UIBarButtonItemStyleDone target:self action:@selector(press)];
 button3.tintColor=[UIColor whiteColor];
    button2.tintColor=[UIColor whiteColor];
[buttons addObject:button3];
    [buttons addObject:button2];
    [tools setItems:buttons animated:NO];
    UIBarButtonItem*btn=[[UIBarButtonItem    alloc]initWithCustomView:tools];
    self.navigationItem.rightBarButtonItem=btn;