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];
}

这样做的正确方法是什么？

Answer 1

使用setImage或setBackButtonBackgroundImage，因为setBackgroundImage无效：

- (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];
}

Answer 2

UIButton *backButton = [UIButton buttonWithType:UIButtonTypeCustom];
[backButton addTarget:self action:@selector(popViewControllerWithAnimation) forControlEvents:UIControlEventTouchUpInside];
backButton.frame = kBarBackButtonFrame;
[backButton setExclusiveTouch:YES];
[backButton setBackgroundImage:[UIImage imageNamed:NAV_BAR_BACK_DEFAULT_BUTTON] forState:UIControlStateNormal];
[backButton setBackgroundImage:[UIImage imageNamed:NAV_BAR_BACK_DEFAULT_BUTTON] forState:UIControlStateHighlighted];
[backButton setBackgroundImage:[UIImage imageNamed:NAV_BAR_BACK_DEFAULT_BUTTON] forState:UIControlStateSelected];
[backButton setTitle:NSLocalizedString(@"Back", nil) forState:UIControlStateNormal];
backButton.titleLabel.font = [UIFont systemFontOfSize:kBarBackButtonTitleFontSize];
[backButton setTitleColor:kBackButtonTitleColor forState:UIControlStateNormal];

UIBarButtonItem *backButtonHolder = [[UIBarButtonItem alloc] initWithCustomView:backButton];

self.navigationItem.rightBarButtonItem = backButtonHolder;

请记住，堆栈中的每个UIViewController都有自己的navigationItem，因此最好的解决方案是创建一个UIViewController子类，并且您使用的每个UIViewController都应该扩展前一个类。我确信有更好的解决方案，但这是我使用的解决方案。

- (void)popViewControllerWithAnimation {
[self.navigationController popViewControllerAnimated:YES];
}

改变按钮背景图像

2 个答案: