更改后退按钮背景图像 [英] Changing back button background image

问题描述

使用此方法更改后退导航按钮的标题和背景图像.标题已更改但按钮保持黑色

Using this method to change title and background image of the back navigation button. Title is changed but button stays black

- (void)viewDidLoad
{
    [super viewDidLoad];
    [self.navigationController.navigationBar setBackgroundImage:[UIImage imageNamed:@"topBarbackground.png"] forBarMetrics:UIBarMetricsDefault];

    UIBarButtonItem *backButton = [UIBarButtonItem new];
    [backButton setBackgroundImage:[UIImage imageNamed:@"backButton.png"] forState:UIControlStateNormal barMetrics:UIBarMetricsDefault];
    [backButton setTitle:NSLocalizedString(@"Back", nil)];
    [[self navigationItem] setBackBarButtonItem:backButton];
}

这样做的正确方法是什么?

What is a proper way of doing this?

推荐答案

使用 setImage 或 setBackButtonBackgroundImage 因为 setBackgroundImage 没有效果:

Use either setImage or setBackButtonBackgroundImage because setBackgroundImage has no effect:

- (void)viewDidLoad
{
    [super viewDidLoad];
    [self.navigationController.navigationBar setBackgroundImage:[UIImage imageNamed:@"topBarbackground.png"] forBarMetrics:UIBarMetricsDefault];

    UIBarButtonItem *backButton = [UIBarButtonItem new];
    // Put the image inside the button
    [backButton setImage:[UIImage imageNamed:@"backButton.png"];
    [backButton setTitle:NSLocalizedString(@"Back", nil)];
    [[self navigationItem] setBackBarButtonItem:backButton];
}

或

{
    [super viewDidLoad];
    [self.navigationController.navigationBar setBackgroundImage:[UIImage imageNamed:@"topBarbackground.png"] forBarMetrics:UIBarMetricsDefault];

    UIBarButtonItem *backButton = [UIBarButtonItem new];
    // Use the image as the button (like custom button)
    [backButton setBackButtonBackgroundImage:[UIImage imageNamed:@"backButton.png"] forState:UIControlStateNormal barMetrics:UIBarMetricsDefault];
    [backButton setTitle:NSLocalizedString(@"Back", nil)];
    [[self navigationItem] setBackBarButtonItem:backButton];
}

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