iOS开发之导航栏的一些小功能

1.隐藏/去掉 导航栏返回按钮中的文字

   [[UIBarButtonItem appearance]       setBackButtonTitlePositionAdjustment:UIOffsetMake(0, -60)
   forBarMetrics:UIBarMetricsDefault];

2.设置statusBar颜色为白色

效果图

   self.navigationController.navigationBar.barStyle = UIBarStyleBlack;
   [[UIApplication sharedApplication]setStatusBarStyle:UIStatusBarStyleLightContent];

如果该方法没有用可：
- (UIStatusBarStyle)preferredStatusBarStyle {
return UIStatusBarStyleLightContent;
}

3.给navigationBar上添加多个按钮

图例

下面贴一个leftItem的例子
- (void)addLeftItem {
UIView *leftBarView = [[UIView alloc]initWithFrame:CGRectMake(0, 0, 80, 31)];

UIButton *phonebutton = [UIButton buttonWithType:UIButtonTypeCustom];
phonebutton.frame=CGRectMake(0, 5, 25, 25);
[phonebutton setImage:[UIImage imageNamed:@"w_qianbao_kefu"] forState:UIControlStateNormal];

UILabel *leftLabel = [[UILabel alloc]initWithFrame:CGRectMake(30, 5, 40, 20)];
leftLabel.text = @"客服";
leftLabel.textColor = [UIColor whiteColor];
leftLabel.font = [UIFont systemFontOfSize:15.0f];
leftLabel.backgroundColor = [UIColor clearColor];

[leftBarView addSubview:leftLabel];
[leftBarView addSubview:phonebutton];
leftBarView.backgroundColor=[UIColor clearColor];

UIBarButtonItem *leftItem = [[UIBarButtonItem alloc]initWithCustomView:leftBarView];
self.navigationItem.leftBarButtonItem = leftItem;
 }

原理:在item上添加一个view，然后再在view上添加按钮

4.给导航栏设置一张背景图

  [self.navigationController.navigationBar setBackgroundImage:[UIImage imageNamed:@"navigationBar_back"] forBarPosition:UIBarPositionAny
barMetrics:UIBarMetricsDefault];

去掉导航栏下方的线

      [self.navigationController.navigationBar setShadowImage:[UIImage new]];