导航栏按钮未显示 [英] Navigation bar button not showing

问题描述

当尝试在左侧和右侧添加导航按钮时，该按钮未显示?这是我使用的代码吗?这是怎么回事?

When try to add a navigation button on left and right side , its not showing?is this is the code i used for, Whats wrong with this?

这是我在appdelegate中添加导航栏的方式，

this is how i added the navigation bar in in appdelegate,

  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;

请帮助.

推荐答案

我认为您的代码没有错只需检查您的图像或尝试使用圆角的rect图像进行测试

I see nothing wrong with your code just check your image or try with a rounded rect image to test

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;

这篇关于导航栏按钮未显示的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！