先在AppDelegate中创建navgationController作为根视图控制器
self.window= [[UIWindowalloc]initWithFrame:[UIScreenmainScreen].bounds];
VCRoot* root = [[VCRootalloc]init];
//导航控制器一定要有一个根视图控制器
UINavigationController* nav = [[UINavigationControlleralloc]initWithRootViewController:root];
//将window的根视图控制器设置为导航
self.window.rootViewController= nav;
[self.windowmakeKeyAndVisible];
然后在根视图控制器中就可以获取到navgationItem（当前页）和navgationController（导航控制器）可以在当前页的导航中增加uibarbuttonitem来调用事件使用导航控制器来推页和退回
self.navigationItem.title=@"根视图";
self.view.backgroundColor= [UIColorwhiteColor];
UIBarButtonItem* rightBtn = [[UIBarButtonItemalloc]initWithTitle:@"下一个"style:UIBarButtonItemStyleDonetarget:selfaction:@selector(pressNext)];
rightBtn.tintColor= [UIColorblueColor];
self.navigationItem.rightBarButtonItem= rightBtn;
- (void)pressNext{
[self.navigationControllerpushViewController:vsanimated:YES];
}
Toolbar底部工具栏
self.navgation.toolbarhidden = NO;
默认是隐藏底部工具栏的 如果要打开需要设置为no
然后在self.toolbarItems = @[]
属性传入一个按钮数组
UIButton* bt = [UIButtonbuttonWithType:UIButtonTypeRoundedRect];
UIBarButtonSystemItemFixedSpace是占位按钮 空白的 可以为负数
UIBarButtonSystemItemFlexibleSpace也是占位按钮 是等分类似space-around
UIBarButtonItem* ub = [[UIBarButtonItemalloc]initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace target:self action:nil];
ub.width= -20;
bt.frame=CGRectMake(0,0,60,40);
[btsetTitle:@"hello"forState:UIControlStateNormal];
self.toolbarItems=@[[[UIBarButtonItemalloc]initWithTitle:@"hello"style:UIBarButtonItemStyleDonetarget:selfaction:nil],
ub
,[[UIBarButtonItemalloc]initWithCustomView:bt]];
