ios - 更改后退按钮背景图像

Question

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

- (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];
}

执行此操作的正确方法是什么？

Answer 1

使用setImage或setBackButtonBackgroundImage，因为setBackgroundImage没有效果:

- (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];
}