假设我有一个带有2个按钮的ViewController A,每个按钮都与ViewController B和C相对应 (查看B的一个按钮和C的其他按钮)。从ViewController C到segConing到ViewController D. 所有ViewControllers都带有导航栏,因此从视图B i可以返回到A,并且从视图D i可以返回到D-> C-> A. 问题是当我在视图D到B之间进行切换时:执行了segue但是现在在B的导航栏中我重新调整以查看D并且我希望B将像它应该返回到A. 什么是解决方案????
答案 0 :(得分:2)
据我所知,这可以通过两种方式完成。
1)使用D控制器上的自定义后退按钮
2)更改navigationController的堆栈,即D控制器类中的self.navigationController.viewControllers的NSArray
使用自定义后退按钮
你可以在D控制器中执行以下操作。仅当A控制器是navigationController的rootViewController时才有效。如果你跟踪你的A控制器,你也可以使用以下
(NSArray *)popToViewController:(UIViewController )viewController animated:(BOOL)animated
- (void)viewDidLoad
{
[super viewDidLoad];
UIBarButtonItem *backButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(goBack:)];
self.navigationItem.leftBarButtonItem = backButton;
self.navigationItem.hidesBackButton = YES;
}
-(void)goBack:(id)sender
{
[self.navigationController popToRootViewControllerAnimated:YES];
}
更改navigationController的堆栈
如果您想要导航到特定的控制器,这很有用。但是从B回到A控制器后仍然会显示后退按钮,您可能需要通过进行一些更改来看到自己。不要尝试更改prepareForSegue中的导航堆栈
- (void)viewDidLoad
{
[super viewDidLoad];
NSMutableArray *controllers = [NSMutableArray arrayWithArray:self.navigationController.viewControllers];
NSMutableSet *controllersToRemove = [NSMutableSet new];
for (id viewController in controllers) {
if (![viewController isKindOfClass:[self class]]&&![viewController isKindOfClass:[NRViewController class]]) {
[controllersToRemove addObject:viewController];
}
}
for (id controller in controllersToRemove) {
[controllers removeObject:controller];
}
self.navigationController.viewControllers = controllers;
}
自定义后退按钮的编辑代码
如果您想要原始的后退按钮
你必须使用图像,代码如下
UIButton *backButton = [[UIButton alloc] initWithFrame: CGRectMake(0, 0, 60.0f, 30.0f)];
UIImage *backImage = [[UIImage imageNamed:@"back_button_normal.png"] resizableImageWithCapInsets:UIEdgeInsetsMake(0, 12.0f, 0, 12.0f)];
[backButton setBackgroundImage:backImage forState:UIControlStateNormal];
[backButton setTitle:@"Back" forState:UIControlStateNormal];
[backButton addTarget:self action:@selector(goBack:) forControlEvents:UIControlEventTouchUpInside];
UIBarButtonItem *backButtonItem = [[UIBarButtonItem alloc] initWithCustomView:backButton];
self.navigationItem.leftBarButtonItem = backButtonItem;