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
你不能以你想要的方式访问导航backButtonItem，你需要创建自己的返回按钮，如下所示:
- (void)loadView
{
[super loadView];
UIButton *backButton = [[UIButton alloc] initWithFrame: CGRectMake(0, 0, 44.0f, 30.0f)];
[backButton setImage:[UIImage imageNamed:@"back.png"] forState:UIControlStateNormal];
[backButton addTarget:self action:@selector(popVC) forControlEvents:UIControlEventTouchUpInside];
self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:backButton];
}
当然了:
- (void) popVC{
[self.navigationController popViewControllerAnimated:YES];
}
其他回答
我写了一个扩展，使这更容易:
extension UIViewController {
/// Convenience for setting the back button, which will be used on any view controller that this one pushes onto the stack
@objc var backButtonTitle: String? {
get {
return navigationItem.backBarButtonItem?.title
}
set {
if let existingBackBarButtonItem = navigationItem.backBarButtonItem {
existingBackBarButtonItem.title = newValue
}
else {
let newNavigationItem = UIBarButtonItem(title: newValue, style:.plain, target: nil, action: nil)
navigationItem.backBarButtonItem = newNavigationItem
}
}
}
}
这在iOS6和ios7上都很有效
Xamarin (c#)选项
var buttonStyleItems = UIBarButtonItem.AppearanceWhenContainedIn(typeof(SettingsNavigationController));
buttonStyleItems.SetBackButtonTitlePositionAdjustment(new UIOffset(-1000, -1000), UIBarMetrics.Default);
objective - c选项
[[UIBarButtonItem外观]setBackButtonTitlePositionAdjustment:UIOffsetMake(-1000， -1000) forBarMetrics:UIBarMetricsDefault];
- (id)initWithCoder:(NSCoder *)aDecoder
{
self = [super initWithCoder:aDecoder];
if (self) {
// Custom initialization
self.navigationItem.backBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"" style:UIBarButtonItemStylePlain target:nil action:nil];
}
return self;
}
就像Kyle Begeman所做的那样，在根视图控制器中添加上面的代码。所有子视图控制器都会被应用。此外，在initWithCoder:方法中添加这个，你可以在xib、storyboard或基于代码的方法中应用根视图控制器的样式。
目标: 自定义UINavigationBar上的所有后退按钮为白色图标
步骤: 1. 在AppDelete的didFinishLaunchingWithOptions方法中:
UIImage *backBtnIcon = [UIImage imageNamed:@"navBackBtn"];
if (SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(@"7.0")) {
[UINavigationBar appearance].tintColor = [UIColor whiteColor];
[UINavigationBar appearance].backIndicatorImage = backBtnIcon;
[UINavigationBar appearance].backIndicatorTransitionMaskImage = backBtnIcon;
}else{
UIImage *backButtonImage = [backBtnIcon resizableImageWithCapInsets:UIEdgeInsetsMake(0, backBtnIcon.size.width - 1, 0, 0)];
[[UIBarButtonItem appearance] setBackButtonBackgroundImage:backButtonImage forState:UIControlStateNormal barMetrics:UIBarMetricsDefault];
[[UIBarButtonItem appearance] setBackButtonTitlePositionAdjustment:UIOffsetMake(0, -backButtonImage.size.height*2) forBarMetrics:UIBarMetricsDefault];
}
2.在普通超级ViewController类的viewDidLoad方法中:
if (SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(@"7.0")) {
UIBarButtonItem *backItem = [[UIBarButtonItem alloc] initWithTitle:@""
style:UIBarButtonItemStylePlain
target:nil
action:nil];
[self.navigationItem setBackBarButtonItem:backItem];
}else{
//do nothing
}
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
