navigationController

navigationController

 //找到当前视图控制器的导航视图控制器,把其透明度设为不透明

    self.navigationController.navigationBar.translucent = NO;

//iOS7 以前导航栏不透明.iOS7以后半透明.高度为20+44.(状态栏+导航栏)

//    //往导航栏上添加view

//    self.navigationItem.title = @"1wewweweweweweeweeweweweweweqwqwew";

//    

    UISegmentedControl *seg = [[UISegmentedControl alloc] initWithItems:@[@"好友",@"通话"]];

    //    [views setBackgroundColor:[UIColor redColor]];

    [self.navigationItem setTitleView:seg];//目前所添加的view居中对齐,可改变大小不可改变坐标位置

    [seg release];

//

//    UIBarButtonItem *bars = [[UIBarButtonItem alloc] initWithTitle:@"左边返回" style:UIBarButtonItemStylePlain target:self action:@selector(laftAction:)];

//    self.navigationItem.leftBarButtonItem = bars;

//    [bars release];

//    

//    UIBarButtonItem *bars2 = [[UIBarButtonItem alloc] initWithTitle:@"右边返回" style:UIBarButtonItemStylePlain target:self action:@selector(laftAction:)];

//    

//    self.navigationItem.rightBarButtonItem = bars2;

//    [bars2 release];

    //添加左边的返回按钮  往上面添加button

    UIButton *button = [[UIButton alloc] initWithFrame:CGRectMake(100, 64, 70, 30) ];

    [button addTarget:self action:@selector(buttonAction:) forControlEvents:UIControlEventTouchUpInside];

    [button setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];

    [button setTitle:@"下一页" forState:UIControlStateNormal];

    [self.view addSubview:button];

    [button release];

    UIBarButtonItem *left = [[UIBarButtonItem alloc] initWithCustomView:button];

    self.navigationItem.leftBarButtonItem = left;

    [left release];