Question

当尝试在左侧和右侧添加导航按钮时，它没有显示？这是我用过的代码，这有什么不对吗？

这就是我在appdelegate中添加导航栏的方式，

  UIViewController *viewController1 = [[logyFirstViewController alloc] initWithNibName:@"logyFirstViewController" bundle:nil];
  UIViewController *viewController2 = [[logySecondViewController alloc] initWithNibName:@"logySecondViewController" bundle:nil];
  UIViewController *viewController3 = [[record alloc] initWithNibName:@"record" bundle:nil];
  UIViewController *viewController4 = [[searchview alloc] initWithNibName:@"searchview" bundle:nil];
  UIViewController *viewController5 = [[profilde alloc] initWithNibName:@"profilde" bundle:nil];
 self.tabBarController = [[UITabBarController alloc] init];

self.tabBarController.viewControllers = @[viewController1, viewController2, viewController3, viewController4, viewController5];
navigationController = [[UINavigationController alloc] initWithRootViewController:self.tabBarController];

self.navigationController.navigationBar.barStyle=UIBarStyleDefault;

[navigationController.navigationBar setAlpha:0.8f];
 [self.window addSubview:[navigationController view]];





 button4 = [UIButton buttonWithType:UIButtonTypeCustom];
 [button4 setFrame:CGRectMake(0.0f, 0.0f, 25.0f, 25.0f)];
 [button4 addTarget:self action:@selector(back) forControlEvents:UIControlEventTouchUpInside];
 [button4 setImage:[UIImage imageNamed:@"del.png"] forState:UIControlStateNormal];
 UIBarButtonItem *random1 = [[UIBarButtonItem alloc] initWithCustomView:button4];
 self.navigationController.navigationItem.leftBarButtonItem=random1;

请帮忙。

Answer 1

我发现您的代码没有任何问题只需检查您的图像或尝试使用圆角矩形图像进行测试

UIButton* button4 = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[button4 setFrame:CGRectMake(0.0f, 0.0f, 25.0f, 25.0f)];
[button4 addTarget:self action:@selector(back) forControlEvents:UIControlEventTouchUpInside];
UIBarButtonItem *random1 = [[UIBarButtonItem alloc] initWithCustomView:button4];

并使用 self.navigationController.navigationBar.topItem.leftBarButtonItem=random1; 代替 self.navigationController.navigationItem.leftBarButtonItem=random1;

Answer 2

问题出在以下几行：

self.navigationController.navigationItem.leftBarButtonItem=random1;

只需使用

self.navigationItem.leftBarButtonItem=random1;

Answer 3

UIButton *button4 =  [UIButton buttonWithType:UIButtonTypeCustom];
[button4 setImage:[UIImage imageNamed:@"del.png"] forState:UIControlStateNormal];
[button4 addTarget:self action:@selector(back) forControlEvents:UIControlEventTouchUpInside];
[button4 setFrame:CGRectMake(0.0f, 0.0f, 25.0f, 25.0f)]];
    self.navigationItem.leftBarButtonItem = [[[UIBarButtonItem alloc] initWithCustomView:button4] autorelease];

对leftBarButtonItem使用相同的方法.Hope它适合你。谢谢

Answer 4

希望它对你有用......

UIButton *button4 = [UIButton buttonWithType:UIButtonTypeCustom];
[button4 setFrame:CGRectMake(0.0f, 0.0f, 25.0f, 25.0f)];
[button4 addTarget:self action:@selector(back) forControlEvents:UIControlEventTouchUpInside];
[button4 setImage:[UIImage imageNamed:@"del.png"] forState:UIControlStateNormal];
UIBarButtonItem *random1 = [[UIBarButtonItem alloc] initWithCustomView:button4];
[button4 release];

[[self navigationItem] setLeftBarButtonItem:random1];
[random1 release];

Answer 5

UIBarButtonItem *barBtnItem = [[UIBarButtonItem alloc] initWithTitle:@"back" style:UIBarButtonItemStyleBordered target:self action:@selector(nextToPhoneAuth)];
self.navigationItem.backBarButtonItem = barBtnItem

Answer 6

请检查您的导航栏是否提供隐藏属性，并尝试使用默认后退按钮一次＆amp;让我们知道它是否有效。

导航栏按钮未显示

6 个答案: