禁用backBarButtonItem

Question

我尝试用以下方法禁用导航控制器的后退按钮项目：

self.navigationItem.backBarButtonItem.enabled = NO;

它似乎不适用于backButtonItem，但适用于其他条形按钮项。有没有办法暂时禁用它而不必隐藏它？

Answer 1

您应该使用以下内容：

self.navigationItem.hidesBackButton = YES;

希望这应该有用。

Answer 2

在我的情况下，我不希望完全隐藏后退按钮，我只是想在我的初始化例程完成时非常简短地禁用它。所以这就是我最终做的事情：

// in initWithNibName
UIButton *backButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[backButton setTitle:@"Cancel" forState:UIControlStateNormal];
[backButton setTitleColor:[UIColor lightGrayColor] forState:UIControlStateDisabled];
[backButton.titleLabel setFont:[UIFont boldSystemFontOfSize:13.0f]];
[backButton setFrame:CGRectMake(0.0f, 0.0f, 68.0f, 28.0f)];
[backButton setEnabled:NO];
[backButton addTarget:self action:@selector(tappedClose) forControlEvents:UIControlEventTouchUpInside];
UIBarButtonItem *buttonItem = [[UIBarButtonItem alloc] initWithCustomView:backButton];
self.navigationItem.leftBarButtonItem = buttonItem;
[buttonItem release];

然后，在初始化例程完成后，我这样做：

UIButton *backNavigationButton = (UIButton *)self.navigationItem.leftBarButtonItem.customView;
[backNavigationButton setEnabled:YES];

稍后我计划从使用UIButtonTypeRoundedRect更改为UIButtonTypeCustom并提供我自己的“后退按钮式”按钮图像。希望这有帮助！