转自http://www.360doc.com/content/15/0114/10/19119980_440632319.shtml
给单独的viewcontroller或者在Appdelegate的主页面添加导航条,只要在viewcontroller上添加navigationcontroller,在添加此navigationcontroller即可
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
self.window = [[UIWindow alloc]initWithFrame:[[UIScreen mainScreen]bounds]];
ViewController *mainView = [[ViewController alloc]init];
UINavigationController *navi = [[UINavigationController alloc]initWithRootViewController:mainView];
navi.navigationBar.backgroundColor = [UIColor blueColor];
[self.window setRootViewController:navi];
[self.window makeKeyAndVisible];
return YES;
}
导航条的字体和颜色的设置
self.navigationController.navigationBar.titleTextAttributes
= [NSDictionary dictionaryWithObject:[UIColor whiteColor]
forKey:UITextAttributeTextColor]; // --- 字体颜色
[self.navigationController.navigationBarsetBackgroundImage:[UIImageimageNamed:@"BJ.png"] forBarMetrics:UIBarMetricsDefault]; // — 背景色
导航条跳转页面的考虑
对于用navigationcontroller来跳转页面的时候,其实是执行堆栈的进栈和出栈的操作,要想释放内存,那么在来回跳转的时候,就要考虑几个问题了
1 A =>B=>C=>D,
D=>A 有根视图的话 (HOME)
[self.navigationController popToRootViewControllerAnimated:YES];
D=>C (每一个界面返回上一层)
[self.navigationController popViewControllerAnimated:YES];
返回到上一层,并且传递参数
CViewController *cvc = [CViewController alloc]init];
cvc.str = self.str;
[self.navigationController popToViewController:cvc animated:true];
返回到上一层后,上一页面显示后要接收参数,并刷新。注意此时应该在viewDidAppear中进行判断并接收传递的值
-(void)viewDidAppear:(BOOL)animated
{
//判断并接收返回的参数
}
2A =>B=>C=>D=>E,E=>B=>C=>E
因为B在之前已经出现过,不能在E中直接PUSH到B,因为那样已经是两个B了,增加内存,所以在跳转的时候,就要进行判断是否之前已经出现过B了,出现过,则直接push。这样push到的是原有的B,不会在内存中重新生成一个B了。
NSArray *array = self.navigationController.viewControllers;
for (UIViewController *vc in array) {
if ([vc isKindOfClass:[BXXXViewController class]]) {
push VC;
}
或者知道每个界面的指针
[self.navigationController
popToViewController: [self.navigationController.viewControllers
objectAtIndex: ([self.navigationController.viewControllers count] -4)]
animated:YES];
在使用时,根据自己返回层的需要,只要改变一下“-4”这个数字就可以达到目的了
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