1.首先UINavigationcontroller 得持有controller
例如
RootViewController *rootVC=[[RootViewController alloc]init];
UINavigationController *rootNC=[[UINavigationController alloc]initWithRootViewController:rootVC];
self.window.rootViewController=rootNC;
2.push哪个controller就把哪个controller引入，在点击事件里初始化，
例如
-(void)ItemCount:(UIBarButtonItem *)sender
{
FirstViewController *fies=[[FirstViewController alloc]init];
[self.navigationController pushViewController:fies animated:YES];
}
3.返回即pop 首先设置
self.navigationItem.title=@"根视图";
UIBarButtonItem *b1=[[UIBarButtonItem alloc]initWithTitle:@"下一张" style:UIBarButtonItemStyleDone target:self action:@selector(ItemCount:)];
self.navigationItem.rightBarButtonItem=b1;
然后在barbutton事件里实现pop的功能
-(void)ItemCount:(UIBarButtonItem *)sender
{
[self.navigationController popToRootViewControllerAnimated:YES];
}
4.模态
push的时候一样
-(void)button2Action:(UIButton *)sender
{
GreenViewController *green=[[GreenViewController alloc]init];
//模态视图 临时弹出
[self presentViewController:green animated:YES completion:nil];
}
一，设置一个button 有点击事件（ 不用navigationcontroller持有，）
二，事件里退回模态就OK了
-(void)buttonAction:(UIButton *)sender
{
//退出模态
[self dismissViewControllerAnimated:YES completion:nil]；
}