初始化toolbar的代码

- (void)initToolBar{    //    UIBarButtonItem * flexble = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil];        _showSegment = [[UISegmentedControl alloc]initWithItems:[NSArray arrayWithObjects:@"开始",@"停止", nil]];    [_showSegment addTarget:self action:@selector(showsSegmentAction:) forControlEvents:UIControlEventValueChanged];    _showSegment.selectedSegmentIndex = 1;    UIBarButtonItem * showItem = [[UIBarButtonItem alloc]initWithCustomView:_showSegment];        //退出程序按钮    UIButton * myBtn = [UIButton buttonWithType:UIButtonTypeSystem];    [myBtn setFrame:CGRectMake(0, 0, 80, 44)];    myBtn.titleLabel.font=[UIFont systemFontOfSize:15];        [myBtn setTitle:@"退出程序" forState:UIControlStateNormal];    myBtn.contentHorizontalAlignment =UIControlContentHorizontalAlignmentLeft;        [myBtn addTarget:self action:@selector(exitAPP) forControlEvents:UIControlEventTouchUpInside];        UIBarButtonItem *myButtonItem1 = [[UIBarButtonItem alloc]initWithCustomView:myBtn];        NSLog(@"showitem width = %f  totalwidth = %f",_showSegment.frame.size.width,CGRectGetWidth(self.view.bounds));        _DesLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, CGRectGetWidth(self.view.bounds)- _showSegment.frame.size.width-26-80, 40)];        _DesLabel.font=[UIFont systemFontOfSize:15];    _DesLabel.backgroundColor = [UIColor clearColor];    _DesLabel.textAlignment = NSTextAlignmentCenter ;    UIBarButtonItem * myButtonItem2 = [[UIBarButtonItem alloc]initWithCustomView:_DesLabel];            self.toolbarItems = [NSArray arrayWithObjects:showItem,myButtonItem2,myButtonItem1, nil];}

退出程序的代码

//退出App- (void)exitAPP{    UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"提示" message:@"要退出程序吗" preferredStyle:UIAlertControllerStyleAlert];        UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:nil];    UIAlertAction *okAction = [UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {        exit(0);    }];        [alertController addAction:cancelAction];    [alertController addAction:okAction];    [self presentViewController:alertController animated:YES completion:nil];    }

Navigation bar 添加搜索栏和右边的按钮

搜索栏：

#pragma mark初始化 搜索栏- (void)initSearchBar{        _searchBar = [[UISearchBar alloc] initWithFrame:CGRectZero];    _searchBar.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;    _searchBar.barStyle = UIBarStyleBlack;    _searchBar.delegate = self;    _searchBar.placeholder = @"请输入要搜索的地址";    _searchBar.keyboardType = UIKeyboardTypeDefault;        //添加搜索栏到NavigationItem的titleView上面    self.navigationItem.titleView = self.searchBar;        [self.searchBar sizeToFit];}

右边离线地图按钮（action还没写）

- (void)addOfflineButton{    //创建一个button    UIBarButtonItem * rightButton = [[UIBarButtonItem alloc]initWithTitle:@"离线地图" style:UIBarButtonItemStylePlain target:self action:nil];        self.navigationItem.rightBarButtonItem = rightButton;}

显示效果如下：