Question

我有一个ViewController，可以通过

打开另一个ViewController

[self.navigationController pushViewController:detailViewController animated:YES];

现在新的VC在导航栏中有一个后退按钮，但是我无法设法为它提供与第一个ViewController中的navBar按钮相同的背景图像。我试过了：

UIImage *buttonImage = [UIImage imageNamed: @"Button.png"];
[self.navigationItem.backBarButtonItem setBackButtonBackgroundImage:buttonImage forState:UIControlStateNormal barMetrics:UIBarMetricsDefault];
[self.navigationItem.backBarButtonItem setTitle:@"doesnt work either"];

但它不起作用。我究竟做错了什么？谢谢！

Answer 1

尝试下面的代码段，它对我来说很好用：

UIBarButtonItem *barBtnItem = [[UIBarButtonItem alloc]initWithTitle:@"Back" style:UIBarButtonItemStyleBordered target:self action:@selector(pop)];

self.navigationItem.backBarButtonItem = barBtnItem;

或者你也可以这样做：

   UIButton *backButton = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, 26, 26)];
   [backButton setImage:[UIImage imageNamed:@"back"] forState:UIControlStateNormal];
   [backButton setShowsTouchWhenHighlighted:TRUE];
   [backButton addTarget:self action:@selector(popViewControllerWithAnimation) forControlEvents:UIControlEventTouchDown];
   UIBarButtonItem *barBackItem = [[UIBarButtonItem alloc] initWithCustomView:backButton];
   self.navigationItem.hidesBackButton = TRUE;
   self.navigationItem.leftBarButtonItem = barBackItem;

享受编码：）

Answer 2

试试这个：

        UIButton *button =  [UIButton buttonWithType:UIButtonTypeCustom];
        [button setImage:[UIImage imageNamed:@"Button.png"] forState:UIControlStateNormal];
        [button addTarget:self action:@selector(pushNav:) forControlEvents:UIControlEventTouchUpInside];
        [button setFrame:CGRectMake(0, 0, 32, 32)];
         self.navigationItem.backBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:button];

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

无法自定义pushViewController的后退按钮

2 个答案: