我试图为后退按钮设置一个自定义图片，当新视图被推入堆栈时，它会自动放置在导航栏上。
我已经尝试在父视图控制器的viewDidLoad中添加以下内容:
[[UIBarButtonItem appearance] setBackButtonBackgroundImage:[UIImage imageNamed:@"BackButton.png"] forState:UIControlStateNormal barMetrics:UIBarMetricsDefault];
我也尝试了以下方法：
UIBarButtonItem *btn = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"BackButton.png"] style:UIBarButtonItemStyleBordered target:nil action:nil];
self.navigationItem.backBarButtonItem = btn;
使用UIAppearance会产生相当奇怪的结果：
试试这段代码
UIButton *backBtn = [UIButton buttonWithType:UIButtonTypeCustom];
UIImage *backBtnImage = [UIImage imageNamed:@"BackBtn.png"] ;
[backBtn setBackgroundImage:backBtnImage forState:UIControlStateNormal];
[backBtn addTarget:self action:@selector(goback) forControlEvents:UIControlEventTouchUpInside];
backBtn.frame = CGRectMake(0, 0, 54, 30);
UIBarButtonItem *backButton = [[UIBarButtonItem alloc] initWithCustomView:backBtn] ;
self.navigationItem.leftBarButtonItem = backButton;
然后像这样定义 goback 方法
- (void)goback
{
[self.navigationController popViewControllerAnimated:YES];
}
自 iOS 7.0 起，API 中有一个新的方法 backIndicatorImage。如果您不想将图像拉伸以适应文本（例如，如果您想要一个固定大小的自定义返回箭头），则可以使用它来替代 setBackButtonBackgroundImage。下面是一个示例（Swift）：
let image = UIImage(named: "back_button")
UINavigationBar.appearance().backIndicatorImage = image
UINavigationBar.appearance().backIndicatorTransitionMaskImage = image
您可以使用这个技巧隐藏按钮中的文本：
UIBarButtonItem.appearance().setBackButtonTitlePositionAdjustment(UIOffsetMake(0, -66), for: .default)
适用于Swift 5:
var backButtonImage = UIImage(named: "back_button")
backButtonImage = backButtonImage?.stretchableImage(withLeftCapWidth: 15, topCapHeight: 30) UIBarButtonItem.appearance().setBackButtonBackgroundImage(backButtonImage, for: .normal, barMetrics: .default)
这是我在自己的iOS 5应用中使用的代码，运行完美。这段代码来自于应用委托中的application:didFinishLaunchingWithOptions:方法：
UIImage * backButtonImage = [UIImage imageNamed: @"back-button-image"];
backButtonImage = [backButtonImage stretchableImageWithLeftCapWidth: 15.0 topCapHeight: 30.0];
[[UIBarButtonItem appearance] setBackButtonBackgroundImage: backButtonImage forState: UIControlStateNormal barMetrics: UIBarMetricsDefault];
你可能需要使用可拉伸图片，其中左边的“点”是左端点
或者在Swift中
let backButtonImage = UIImage(named: "back-button-image")
backButtonImage = backButtonImage?.stretchableImageWithLeftCapWidth(15, topCapHeight: 30)
UIBarButtonItem.appearance().setBackButtonBackgroundImage(backButtonImage, forState: .Normal, barMetrics: .Default)
iOS 8+ 版本的 Swift（可以很容易地转换为 ObjC）。这种方法保留了与标准返回按钮相关的导航栏所有优点和行为（推入/弹出时的动画，交互式弹出手势等）
// Call the code ONE TIME somewhere on app launch to setup custom back button appearance
UINavigationBar.appearance().tintColor = UIColor.blackColor()
// If you need custom positioning for your back button, in this example button will be 1 px up compared to default one
// Also only vertical positioning works, for horizontal add offsets directly to the image
let backImageInsets = UIEdgeInsetsMake(0, 0, -1, 0)
// Get image, change of rendering (so it preserves offsets made in file), applying offsets
let backImage = UIImage(named: "YourButtonImageAssetFileName")?.imageWithRenderingMode(.AlwaysOriginal).imageWithAlignmentRectInsets(backImageInsets)
// Setting images
UINavigationBar.appearance().backIndicatorImage = backImage
UINavigationBar.appearance().backIndicatorTransitionMaskImage = backImage
// Call EACH TIME BEFORE pushing view controller if you don't need title near your back button arrow
self.navigationItem.backBarButtonItem = UIBarButtonItem(title: "", style: .Plain, target: nil, action: nil)
// Push controller
self.navigationController?.pushViewController(vc, animated: true)
尝试下面的代码，这对我有效：
[[UINavigationBar appearance] setBackIndicatorImage:[UIImage imageNamed:@"back-button-image"]];
[[UINavigationBar appearance] setBackIndicatorTransitionMaskImage:[UIImage imageNamed:@"back-button-image"]];
这段代码适用于 Swift 5 和 XCode 10 ：
将以下代码添加到AppDelegate的func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool中，以应用于您所有的视图控制器：
//Custom back button
let barButtonItemAppearance = UIBarButtonItem.appearance()
barButtonItemAppearance.setTitleTextAttributes([NSAttributedStringKey.foregroundColor: UIColor.clear], for: .normal)
barButtonItemAppearance.setTitleTextAttributes([NSAttributedStringKey.foregroundColor: UIColor.clear], for: .highlighted)
let backImg: UIImage = UIImage(named: "back")!
barButtonItemAppearance.setBackButtonBackgroundImage(backImg, for: .normal, barMetrics: .default)
let image = UIImage()
UINavigationBar.appearance().backIndicatorImage = image
UINavigationBar.appearance().backIndicatorTransitionMaskImage = image
(UIButton *)drawNavigationBarBackButton:(UIViewController*)viewController
{
UIImage *navBackImage = nil;
UIButton *backButton = [UIButton buttonWithType:UIButtonTypeCustom];
navBackImage = [UIImage imageNamed:@"Back_Button"];
[backButton setImage:navBackImage forState:UIControlStateNormal];
UIBarButtonItem *leftButton = [[UIBarButtonItem alloc] initWithCustomView:backButton];
viewController.navigationItem.leftBarButtonItem = leftButton;
return backButton;
}
call from controller class and setting action
- (void)viewDidLoad {
[super viewDidLoad];
UIButton *backButton = [CommonClass drawNavigationBarBackButton:self];
[backButton addTarget:self action:@selector(onTapBackButton) forControlEvents:UIControlEventTouchUpInside];
}
- (void)onTapBackButton
{
[self.navigationController popViewControllerAnimated:YES];
}
这对我有用：
let button1 = UIBarButtonItem(
image: #imageLiteral(resourceName: "back_arrow"),
style: .plain,
target: self,
action: #selector(self.backBtnTapped(_:))
)
self.navigationItem.leftBarButtonItem = button1
backBarButtonItem方法成功了吗？ - Brian Nickel@" "，或者在使用第一种方法的同时将返回按钮文本颜色设置为透明。 - Brian Nickel