Question

我想更改UINavigationBar的后退按钮

我可以使用此代码执行此操作：

 // Set the custom back button
    UIImage *buttonImage = [UIImage imageNamed:@"backag.png"];

    //create the button and assign the image
    UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
    [button setImage:buttonImage forState:UIControlStateNormal];
    [button setImage:[UIImage imageNamed:@"selback.png"] forState:UIControlStateHighlighted]; 
    button.adjustsImageWhenDisabled = NO;


    //set the frame of the button to the size of the image (see note below)
    button.frame = CGRectMake(0, 0, 30, 30);

    [button addTarget:self action:@selector(back) forControlEvents:UIControlEventTouchUpInside];

    //create a UIBarButtonItem with the button as a custom view
    UIBarButtonItem *customBarItem = [[UIBarButtonItem alloc] initWithCustomView:button];
    self.navigationItem.leftBarButtonItem = customBarItem;
    self.navigationItem.hidesBackButton = YES;

    // Cleanup
    [customBarItem release];

但我必须将该代码放在每个viewDidLoad方法中。我想为整个计划做一次。

我的尝试是这样的：

 UIImage *buttonBack30 = [[UIImage imageNamed:@"backag"] //16 5
                             resizableImageWithCapInsets:UIEdgeInsetsMake(1000, 1000, 1000, 1000)];
    UIImage *buttonBack31 = [[UIImage imageNamed:@"selback"] 
                             resizableImageWithCapInsets:UIEdgeInsetsMake(0, 0, 0, 0)];
    [[UIBarButtonItem appearance] setBackButtonBackgroundImage:buttonBack30 
                                                      forState:UIControlStateNormal barMetrics:UIBarMetricsDefault];
    //[[UIBarButtonItem appearance] setBackButtonBackgroundImage:buttonBack31 
    //                forState:UIControlStateSelected barMetrics:UIBarMetricsDefault];
    [[UIBarButtonItem appearance] setBackButtonBackgroundImage:buttonBack31 
                                                      forState:UIControlStateHighlighted barMetrics:UIBarMetricsDefault];

    NSMutableDictionary *attributes = [NSMutableDictionary dictionary];
    [attributes setValue:[UIColor colorWithRed:(163.0f/255.0f) green:(0.0f) blue:(0.0f) alpha:1.0f] forKey:UITextAttributeTextColor];
    [attributes setValue:[UIColor clearColor] forKey:UITextAttributeTextShadowColor];
    // [attributes setValue:[UIFont fontWithName:@"Helvetica" size:15] forKey:UITextAttributeFont];
    [attributes setValue:[NSValue valueWithUIOffset:UIOffsetMake(0.0, 0.0)] forKey:UITextAttributeTextShadowOffset];
    [[UIBarButtonItem appearance] setTitleTextAttributes:attributes forState:UIControlStateHighlighted];

但它会延伸图像并在其上绘制文字，这是我不想要的。我只想在每个视图中使用相同大小的图像。

谢谢！

Answer 1

从iOS 5.0开始，您可以使用全局外观修饰符来更改整个应用中的所有后退按钮：

[[UIBarButtonItem appearance] setBackButtonBackgroundImage:[UIImage imageNamed:@"back_button_bg"]
                                        forState:UIControlStateNormal
                                      barMetrics:UIBarMetricsDefault];

背景图片必须是可调整大小的图像才能获得良好效果。

Answer 2

这可能会有用。在appdelegate的顶部添加以下内容。

    @implementation UIViewController (CustomFeatures)
-(void)setNavigationBar{
    // Set the custom back button
    UIImage *buttonImage = [UIImage imageNamed:@"backag.png"];

    //create the button and assign the image
    UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
    [button setImage:buttonImage forState:UIControlStateNormal];
    [button setImage:[UIImage imageNamed:@"selback.png"] forState:UIControlStateHighlighted]; 
    button.adjustsImageWhenDisabled = NO;


    //set the frame of the button to the size of the image (see note below)
    button.frame = CGRectMake(0, 0, 30, 30);

    [button addTarget:self action:@selector(back) forControlEvents:UIControlEventTouchUpInside];

    //create a UIBarButtonItem with the button as a custom view
    UIBarButtonItem *customBarItem = [[UIBarButtonItem alloc] initWithCustomView:button];
    self.navigationItem.leftBarButtonItem = customBarItem;
    self.navigationItem.hidesBackButton = YES;

    // Cleanup
    [customBarItem release];
}
@end

并在[self setNavigationBar];

中致电viewDidLoad

Answer 3

使用此代码并享受......

UIButton *leftButton = [UIButton buttonWithType:UIButtonTypeCustom]; 
[leftButton setUserInteractionEnabled:NO];
[leftButton setImage:[UIImage imageNamed:@"backag.png"] forState:UIControlStateNormal];    
leftButton.frame = CGRectMake(0, 0, 30, 30);
[leftButton addTarget:self action:@selector(YourclickeventClick:) forControlEvents:UIControlEventTouchUpInside];        
self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:leftButton];
[leftbutton release];

希望，这会对你有帮助..

Answer 4

您可以为backBarButtonItem创建自定义按钮，然后对其进行自定义。

转到这个问题 - How do you change color/image on the default backBarButtonItem?，你可以在那里找到答案。

要使条形按钮项看起来像backBarButtonItem，请参阅此答案。 Creating a left-arrow button (like UINavigationBar's "back" style) on a UIToolbar

Answer 5

这是 Swift

的有效解决方案

    let backImage = UIImage(named: "back")
    UINavigationBar.appearance().backIndicatorImage = backImage
    UINavigationBar.appearance().backIndicatorTransitionMaskImage = backImage
    UIBarButtonItem.appearance().setTitleTextAttributes([NSAttributedString.Key.foregroundColor:
        UIColor.white], for: .normal)
    UIBarButtonItem.appearance().tintColor = UIColor.green //if you want to change color

使用[UINavigationBar外观]更改后退按钮图像

5 个答案: