我如何自定义导航返回按钮在iOS 7及以上没有标题?(即只使用箭头)
self.navigationItem.leftBarButtonItem = self.editButtonItem;
我只是想知道它们是否有self。backbuttonitem;
OR
像这样的东西?
self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc]
initWithBarButtonSystemItem:UIBarButtonSystemItemBACK
target:self action:@selector(back)];
当前回答
你可以子类化UINavigationController，将自己设置为委托，并在委托方法navigationController:willShowViewController:animated中设置backBarButtonItem:
@interface Custom_NavigationController : UINavigationController <UINavigationControllerDelegate>
@end
@implementation Custom_NavigationController
- (void)viewDidLoad
{
[super viewDidLoad];
self.delegate = self;
}
#pragma mark - UINavigationControllerDelegate
- (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated
{
viewController.navigationItem.backBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"" style:UIBarButtonItemStylePlain target:nil action:nil];
}
@end
其他回答
我从iOS 5开始就一直在使用这个解决方案，没有任何问题。我在视图控制器中调用了一个实用函数。你需要在viewDidLoad或之后的任何点中做。
void updateBackButtonTextForViewController(UIViewController *viewController, NSString *text)
{
if(! viewController.navigationItem.backBarButtonItem)
{
viewController.navigationItem.backBarButtonItem =
[[UIBarButtonItem alloc] initWithTitle:text
style:UIBarButtonItemStylePlain
target:nil action:nil];
}
else
{
viewController.navigationItem.backBarButtonItem.title = text;
}
}
在某些情况下，导航项可能已经存在，在其他情况下需要创建它。这在不影响导航项标题的情况下解释了这两种情况。它允许你通过简单地传入@""来删除标题。
添加新的UIBarButtonItem到左边的UINavigationItem 改变UIBarButtonItem的使用方式 现在，点击UINavigationItem，并从outlets滑动barBackButtonItem到左UIBarButtonItem
你可以在viewWillDisappear上将当前ViewController的标题改为@""，当它即将再次显示时，将标题重新设置为之前的标题。
-(void) viewWillAppear:(BOOL)animated {
[super viewWillAppear:animated];
self.title = @"Previous Title";
}
-(void) viewWillDisappear:(BOOL)animated {
[super viewWillDisappear:animated];
self.title = @"";
}
其实很简单，我是这么做的:
Objective - C
// Set this in every view controller so that the back button displays back instead of the root view controller name
self.navigationItem.backBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"" style:UIBarButtonItemStylePlain target:nil action:nil];
斯威夫特2
self.navigationItem.backBarButtonItem = UIBarButtonItem(title: "", style: .Plain, target: nil, action: nil)
斯威夫特3
self.navigationItem.backBarButtonItem = UIBarButtonItem(title: "", style: .plain, target: nil, action: nil)
把这一行放到推送到堆栈(前一个视图控制器)的视图控制器中。新按下的视图控制器返回按钮现在将显示你为initWithTitle所放的任何东西，在本例中是一个空字符串。
如果你设置了导航栏的tintColor，添加一个没有标题的自定义后退按钮图像，该图像的tintColor将反映图像的颜色。请点击苹果文档链接。
https://developer.apple.com/library/content/documentation/UserExperience/Conceptual/UIKitUICatalog/index.html#//apple_ref/doc/uid/TP40012857-UIView-SW7
UINavigationItem *navItem = [[UINavigationItem alloc] init];
navBar.tintColor = self.tintColor;
UIImage *myImage = [UIImage imageNamed:@"left_arrow.png"];
myImage = [myImage imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate];
UIBarButtonItem *leftButton = [[UIBarButtonItem alloc] initWithImage:myImage style:UIBarButtonItemStylePlain target:self action:@selector(cancelButtonFunction:)];
navItem.leftBarButtonItem = leftButton;
navBar.items = @[ navItem ];
