有些时候，我们要给导航栏添加button，本文简单介绍一下如何添加，代码如下：
self.navigationItem.rightBarButtonItem = [UIBarButtonItem navItemWithTitle:@"按钮Title" target:self action:@selector(buttonClick)];//注意 - 该初始方法是自定义方法
下面是为UIBarButtonItem添加的分类中的一个方法
//想要修改添加的button的样式，在如下代码中进行相应的改动
+(instancetype)navItemWithTitle:(NSString *)title target:(id)target action:(SEL)action
{
UIButton *moreBtn=[UIButton buttonWithType:UIButtonTypeCustom];
[moreBtn setFrame:CGRectMake(0,5,70,50)];
[moreBtn setTitle:title forState:UIControlStateNormal];
[moreBtn setTitleColor:ColorLightGray forState:UIControlStateNormal];
[moreBtn setTitleColor:[UIColor whiteColor] forState:UIControlStateHighlighted];
[moreBtn.titleLabel setFont:[UIFont systemFontOfSize:14]];
[moreBtn addTarget:target action:action forControlEvents:UIControlEventTouchUpInside];
return [[self alloc]initWithCustomView:moreBtn];
}
更复杂的样式设置，本文就不多做介绍了，请自行摸索；
