如何删除所有导航栏后退按钮标题

Question

当我按下它时UIViewController,它在新的后退按钮中有一些标题UIViewController,如果标题有很多文本,它在iPhone 4s看起来不太好所以我想删除它.

如果我在prepareForSegue函数中添加一些代码,那将是一个麻烦.

有没有更好的方法实现这一目标

Answer 1

如果你想要后退箭头,那么将代码放入AppDelegate文件中的didFinishLaunchingWithOptions方法.

For Objective-C

 [[UIBarButtonItem appearance] setBackButtonTitlePositionAdjustment:UIOffsetMake(0, -60) forBarMetrics:UIBarMetricsDefault];

For Swift

let BarButtonItemAppearance = UIBarButtonItem.appearance()
BarButtonItemAppearance.setTitleTextAttributes([NSForegroundColorAttributeName: UIColor.clear], for: .normal)

下面给出另一个选择.

在 Objective C

self.navigationItem.backBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"" style:UIBarButtonItemStylePlain target:nil action:nil];

在 Swift

self.navigationItem.backBarButtonItem = UIBarButtonItem(title:"", style:.plain, target:nil, action:nil)

更新:

    let BarButtonItemAppearance = UIBarButtonItem.appearance()

    let attributes: [NSAttributedStringKey: Any] = [
    BarButtonItemAppearance.setTitleTextAttributes([NSForegroundColorAttributeName: UIColor.clear], for: .normal)
            NSAttributedStringKey.font: UIFont.systemFont(ofSize: 0.1),
            NSAttributedStringKey.foregroundColor: UIColor.clear]

    BarButtonItemAppearance.setTitleTextAttributes(attributes, for: .normal)
    BarButtonItemAppearance.setTitleTextAttributes(attributes, for: .highlighted)

更新SWIFT 4.1:

    let attributes = [NSAttributedStringKey.font:  UIFont(name: "Helvetica-Bold", size: 0.1)!, NSAttributedStringKey.foregroundColor: UIColor.clear]

    BarButtonItemAppearance.setTitleTextAttributes(attributes, for: .normal)
    BarButtonItemAppearance.setTitleTextAttributes(attributes, for: .highlighted)

使用偏移量

UIBarButtonItem.appearance().setBackButtonTitlePositionAdjustment(UIOffsetMake(-1000, 0), for:UIBarMetrics.default)

所以可能你的问题已经解决了.

快乐的编码.

Answer 2

工作就像Swift 3上的魅力一样

self.navigationController?.navigationBar.topItem?.title = " "

Answer 3

我在AppDelegate文件中使用这行代码didFinishLaunchingWithOptions来删除后退按钮title.

Swift 2.x

let barAppearace = UIBarButtonItem.appearance()
barAppearace.setBackButtonTitlePositionAdjustment(UIOffsetMake(0, -60), forBarMetrics:UIBarMetrics.Default)

Swift 3.x

UIBarButtonItem.appearance().setBackButtonTitlePositionAdjustment(UIOffsetMake(0, -60), for:UIBarMetrics.default)

Swift 4.x

UIBarButtonItem.appearance().setTitleTextAttributes([NSAttributedStringKey.foregroundColor: UIColor.clear], for: .normal)
    UIBarButtonItem.appearance().setTitleTextAttributes([NSAttributedStringKey.foregroundColor: UIColor.clear], for: UIControlState.highlighted)

Answer 4

只需要从其他ViewControllers所依赖的父ViewController中进行操作.

override func viewWillDisappear(animated: Bool) {
super.viewWillDisappear(true)
navigationItem.backBarButtonItem = UIBarButtonItem(title: "", style: .Plain, target: nil, action: nil)}

Answer 5

只需将代码复制到 didFinishLaunchingWithOptions launchOptions

迅捷5

UIBarButtonItem.appearance().setBackButtonTitlePositionAdjustment(UIOffset(horizontal: -1000.0, vertical: 0.0), for: .default)

斯威夫特4

UIBarButtonItem.appearance().setBackButtonTitlePositionAdjustment(UIOffsetMake(-1000.0, 0.0), for: .default)

Answer 6

很简单.在后退按钮的标题中添加一个空格并准备好.请记住,它必须位于您要删除文本的上一个视图中.

Answer 7

您可以使用xcode 8和swift 3.0

self.navigationController?.navigationBar.backItem?.title = " "

Answer 8

在 iOS 14 上，现在backButtonDisplayMode在UINavigationItem类中呈现该属性。因此，要删除后退按钮标题，您可以使用

navigationItem.backButtonDisplayMode = .minimal

在viewDidLoad要删除它的 viewController的func 中。

要在所有导航栏中删除它，我使用了 swizzling 技术

import UIKit

private let swizzling: (UIViewController.Type, Selector, Selector) -> Void = { forClass, originalSelector, swizzledSelector in
    if let originalMethod = class_getInstanceMethod(forClass, originalSelector), let swizzledMethod = class_getInstanceMethod(forClass, swizzledSelector) {
        let didAddMethod = class_addMethod(forClass, originalSelector, method_getImplementation(swizzledMethod), method_getTypeEncoding(swizzledMethod))
        if didAddMethod {
            class_replaceMethod(forClass, swizzledSelector, method_getImplementation(originalMethod), method_getTypeEncoding(originalMethod))
        } else {
            method_exchangeImplementations(originalMethod, swizzledMethod)
        }
    }
}

extension UIViewController {
    
    static func swizzle() {
        let originalSelector1 = #selector(viewDidLoad)
        let swizzledSelector1 = #selector(swizzled_viewDidLoad)
        swizzling(UIViewController.self, originalSelector1, swizzledSelector1)
    }
    
    @objc open func swizzled_viewDidLoad() {
        if let _ = navigationController {
            if #available(iOS 14.0, *) {
                navigationItem.backButtonDisplayMode = .minimal
            } else {
                // Fallback on earlier versions
                navigationItem.backButtonTitle = ""
            }
        }
        swizzled_viewDidLoad()
    }
}

并在application(_:didFinishLaunchingWithOptions:)通话中

UIViewController.swizzle()

Answer 9

iOS13的方法。

let backButtonAppearance = UIBarButtonItemAppearance(style: .plain)
backButtonAppearance.normal.titleTextAttributes = [.foregroundColor: UIColor.clear]

let navigationBarAppearance = UINavigationBarAppearance()
navigationBarAppearance.backButtonAppearance = backButtonAppearance

UINavigationBar.appearance().standardAppearance = navigationBarAppearance

Answer 10

let barAppearace = UIBarButtonItem.appearance()
barAppearace.setBackButtonTitlePositionAdjustment(UIOffsetMake(0, -60), for:UIBarMetrics.default)

在swift 3.0中使用了这行代码

Answer 11

您可以为UIViewController您想要此行为的所有s 创建子类,并在子类中创建viewDidLoad:

override func viewDidLoad() {
    super.viewDidLoad()
    self.navigationItem.backBarButtonItem = UIBarButtonItem(
        title: "", style: .plain, target: nil, action: nil)
}

这样,您可以选择您希望行为的控制器,而无需重复代码.我更喜欢我的控制器只是说"后退",而不是前一个控制器的标题,所以我在这里设置了这个标题.

Answer 12

从获得灵感rordulu的答案在这里,我最终创建一个自定义的UINavigationController和UINavigation酒吧,似乎处理这个棘手的问题的所有情况.

1)UINavigationController使用您的自定义初始化UINavigationBar:

class CustomNavigationController: UINavigationController {

    convenience init() {
        self.init(navigationBarClass: CustomNavigationBar.self, toolbarClass: nil)
    }
}

2)backItem.title每次视图自行设置时,将导航栏的属性设置为空字符串

class CustomNavigationBar: UINavigationBar {

    override func layoutSubviews() {
        backItem?.title = ""
        super.layoutSubviews()
    }
}

现在每次使用此导航控制器和条形组合时,它都不会有后退按钮文本!

注意:如果还使用故事板,这应该可以正常工作,只需确保将自定义导航栏组件放入视图中