Question

我想创建一个没有彩色背景的UINavigationBar。

我试过

 self.navigationController.navigationBar.backgroundColor = [UIColor clearColor];

和

 self.navigationController.navigationBar.backgroundColor = nil;

但无法解决问题。我还尝试为self.view.backgroundColor使用的导航栏设置相同的颜色，但我无法覆盖原始的颜色。（我使用Storyboard可能导致问题，但不确定，因为我可以用代码操纵tintColor。）

Answer 1

self.navigationController.navigationBarHidden = NO;
    [self.navigationController.navigationBar setBackgroundImage:[UIImage new]
                             forBarMetrics:UIBarMetricsDefault];
    self.navigationController.navigationBar.shadowImage = [UIImage new];
    self.navigationController.navigationBar.translucent = YES;

UIButton *backButton = [UIButton buttonWithType:UIButtonTypeCustom];
//[backButton setImage:[UIImage imageNamed:@"you_back_image"] forState:UIControlStateNormal]; this is the image you would use as a back image
[backButton setTitle:@"back" forState:UIControlStateNormal];
[backButton sizeToFit];
[backButton addTarget:self action:@selector(goBack) forControlEvents:UIControlEventTouchUpInside];
UIBarButtonItem* backBarButton = [[UIBarButtonItem alloc] initWithCustomView:backButton];
self.navigationItem.leftBarButtonItem = backBarButton;

然后编写方法goBack，这取决于你呈现或推送当前ViewController的事实。

- (void)goBack {
//[self dismissViewControllerAnimated:YES] 
//[self.navigationController popViewControllerAnimated:YES];
}

Answer 2

在appDelegates中尝试这一个didFinishLaunchingWithOptions方法，它清除导航栏的背景颜色

[[UINavigationBar外观] setBarTintColor：[UIColor clearColor]];

没有backgroundColor的UINavigationBar

2 个答案: