在 iOS7 中删除后退箭头

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【中文标题】在 iOS7 中删除后退箭头【英文标题】:Remove back arrow in iOS7 【发布时间】:2013-12-12 04:36:52 【问题描述】:

我想加入一个自定义后退按钮 - 我可以使用

获得上述结果
self.navigationItem.backBarButtonItem = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"back-btn"] style:UIBarButtonItemStylePlain target:nil action:nil];

但是如何移除原生的蓝色按钮呢?

【问题讨论】:

【参考方案1】:

使用下面的代码隐藏后退箭头:

self.navigationItem.backBarButtonItem = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"back-btn"]
                                                                         style:UIBarButtonItemStylePlain
                                                                        target:nil
                                                                        action:nil];

if ([UINavigationBar instancesRespondToSelector:@selector(setBackIndicatorImage:)]) 
    [[UINavigationBar appearance] setBackIndicatorImage:[[UIImage alloc] init]];
    [[UINavigationBar appearance] setBackIndicatorTransitionMaskImage:[[UIImage alloc] init]];

【讨论】:

删除所有箭头,但添加“返回”文本。 如果你添加了backbarbuttonitem,那么它不会显示任何“Back”文本【参考方案2】:

ios7+中你可以使用navigationBar的backIndicatorImagebackIndicatorTransitionMaskImage来实现你想要的自定义箭头。 Swift 代码如下:

self.navigationController?.navigationBar.backIndicatorImage = UIImage(named:"button-backArrow18x15")
self.navigationController?.navigationBar.backIndicatorTransitionMaskImage = UIImage(named:"button-backArrowMask18x15")

如果要隐藏“后退”文本,可以将前一个视图的title 设置为单个空格“”或使用没有标题的自定义UIBarButtonItem

【讨论】:

你可能需要使用UIImage(named: "back-arrow")?.withRenderingMode(.alwaysOriginal)来渲染原图。【参考方案3】:

你可以隐藏后退按钮

 self.navigationItem.hidesBackButton=YES;

要创建自定义左栏按钮,您可以使用:

UIButton* someButton = [UIButton buttonWithType:UIButtonTypeCustom];
[someButton setFrame:frame];
[someButton setBackgroundImage:@"youArroImageName" forState:UIControlStateNormal];
[someButton addTarget:self action:@selector(backButtonAction:) forControlEvents:UIControlEventTouchUpInside];
[someButton setShowsTouchWhenHighlighted:YES];
UIBarButtonItem* someBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:someButton];
[self.navigationItem setLeftBarButtonItem:someBarButtonItem];

【讨论】:

完全隐藏,我想显示自定义的白色箭头。 为此,您必须创建 Custon LeftBarButton 项目。并设置为左栏按钮项。 我还添加了代码以创建自定义 leftebarbuttonitem。【参考方案4】:

检查这个:

    UIImage *faceImage = [UIImage imageNamed:@"back_arrow.png"];
    UIButton *face = [UIButton buttonWithType:UIButtonTypeCustom];
    face.bounds = CGRectMake( 10, 0, faceImage.size.width, faceImage.size.height );
    [face addTarget:self action:@selector(handleBack:) forControlEvents:UIControlEventTouchUpInside];
    [face setImage:faceImage forState:UIControlStateNormal];
    UIBarButtonItem *backButton = [[UIBarButtonItem alloc] initWithCustomView:face];
    self.navigationItem.leftBarButtonItem = backButton;
    [self.navigationItem setHidesBackButton:YES animated:YES];
    [self.navigationItem setBackBarButtonItem:nil];


  -(IBAction)handleBack:(id)sender
  
     //    [self dismissViewControllerAnimated:YES completion:nil];
     [self.navigationController popViewControllerAnimated:YES];
  

【讨论】:

其实比我发现的要简单,看我的回答 @daidai 我将其作为自定义视图,因此您也可以将其设置为框架或绑定,但在您的代码中我们没有设置它。【参考方案5】:

感谢所有回答者 - 找到了一种更简单的方法......

self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"back-btn"] style:UIBarButtonItemStylePlain target:self action:@selector(backButtonAction:)];
self.navigationItem.leftBarButtonItem.tintColor = [UIColor whiteColor];

[self.navigationItem setHidesBackButton:YES animated:NO];
[self.navigationItem setBackBarButtonItem:nil];

-(void) backButtonAction:(id)sender

    [self.navigationController popViewControllerAnimated:YES];

【讨论】:

值得注意的是,使用此方法您将失去弹出滑动手势 同样值得注意的是,这是在做一些完全不同的事情。您正在从顶部控制器设置后退按钮,而不是实际返回的控制器。您必须对位于顶部的任何控制器执行此操作...【参考方案6】:

您为什么不能尝试使用自定义 UIButton:

UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];
    [btn setFrame:CGRectMake(0.0f, 0.0f, 25.0f, 40.0f)];
    [btn addTarget:self action:@selector(buttonEN:) forControlEvents:UIControlEventTouchUpInside];
    [btn setImage:[UIImage imageNamed:@"back-btn"] forState:UIControlStateNormal];
    UIBarButtonItem *backBtn = [[UIBarButtonItem alloc] initWithCustomView:btn];
    self.navigationItem.backBarButtonItem = backBtn;

【讨论】:

【参考方案7】:

我刚刚遇到了完全相同的问题,这就是我最终要做的:

// First set the back button text to an empty string
viewController.navigationItem.backBarButtonItem = 
     [[UIBarButtonItem alloc] initWithTitle:@"" 
          style:UIBarButtonItemStylePlain 
          target:nil 
          action:nil];

// Set the back-indicator image to the custom image (scaled to 20x20)
UIImage *img = [MyUtils imageWithImage:[UIImage imageNamed:@"back"] scaledToSize:CGSizeMake(20, 20)];
[[UINavigationBar appearance] setBackIndicatorImage:img];
[[UINavigationBar appearance] setBackIndicatorTransitionMaskImage:img];

// Set the tint color to WHITE
[[UINavigationBar appearance] setTintColor:[UIColor whiteColor]];

图片缩放方法如下:

+ (UIImage *)imageWithImage:(UIImage *)image scaledToSize:(CGSize)newSize 
    UIGraphicsBeginImageContextWithOptions(newSize, NO, 0.0);
    [image drawInRect:CGRectMake(0, 0, newSize.width, newSize.height)];
    UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return newImage;

上述缩放方法的功劳归于Paul Lynch 关于这个 SO 问题:(The simplest way to resize an UIImage?)

【讨论】:

【参考方案8】:

Swift 4(如果你只想隐藏它)

let mask = UIImage()
navigationController?.navigationBar.backIndicatorImage = mask
navigationController?.navigationBar.backIndicatorTransitionMaskImage = mask

【讨论】:

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