Iphone 删除uibarbuttonitem后退按钮的背景图像
我想删除UIViewController backbutton的背景 我该怎么做 我尝试了以下代码Iphone 删除uibarbuttonitem后退按钮的背景图像,iphone,ios,uibarbuttonitem,back-button,Iphone,Ios,Uibarbuttonitem,Back Button,我想删除UIViewController backbutton的背景 我该怎么做 我尝试了以下代码 backButton = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"back.png"] landscapeImagePhone:nil style:UIBarButtonSystemItemCancel target:self action:nil]; [backButton setBackgroundIma
backButton = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"back.png"] landscapeImagePhone:nil style:UIBarButtonSystemItemCancel target:self action:nil];
[backButton setBackgroundImage:nil forState:UIControlStateNormal barMetrics:UIBarMetricsDefault];
self.navigationItem.backBarButtonItem = backButton;
但它不起作用
u导航。backBarButtonItem
不用于设置当前视图控制器的后退按钮,它用于设置从当前视图控制器按下的控制器的后退按钮
假设现在UINavigationController
中显示了ViewController1
,您可以设置ViewController1
的backBarButton
。后退按钮不会改变,但当你按下ViewController2
,你会看到ViewController2
的后退按钮是你为ViewController1
设置的
要设置
ViewController1
的后退按钮,您可以在按ViewController1
的ViewController中设置它,或者您可以使用self.navigationItem.leftBarButtonim=YourButton
,后一种方法需要在按钮上添加事件侦听器,不要试图修改UINavigationBar
的后退按钮图像。这是不可能的,因为这是默认情况
而是将另一个自定义ui按钮
作为ui导航栏
项,然后您可以根据需要自定义它
UIButton *btnItem = [[UIButton alloc]initWithFrame:CGRectMake(0, 0, 30, 30)];
[btnItem setTitle:@"title" forState:UIControlStateNormal];
[btnItem addTarget:self action:@selector(btnItem_click:) forControlEvents:UIControlEventTouchUpInside];
self.topItem.leftBarButtonItem = [[UIBarButtonItem alloc]initWithCustomView:btnItem];
这个代码对我有用
UIImage *backButtonImage = [UIImage imageNamed:@"back.png"];
UIButton *backButton = [UIButton buttonWithType:UIButtonTypeCustom];
[backButton addTarget:self action:@selector(backButtonPressed) forControlEvents:UIControlEventTouchUpInside];
[backButton setBackgroundImage:backButtonImage forState:UIControlStateNormal];
[backButton setFrame:CGRectMake(0, 0, 30, 30)];
UIBarButtonItem *backBarButton = [[UIBarButtonItem alloc] initWithCustomView:backButton];
[backBarButton setAction:@selector(backButtonPressed)];
self.navigationItem.leftBarButtonItem = backBarButton;
-(void)backButtonPressed{
[self.navigationController popViewControllerAnimated:YES];
}
您正在尝试修改
UINavigationBar
后退按钮的
后退图像?是的,我正在尝试!请澄清您的问题??使用图像进行解释,如果您同时使用UIBarButtonSystemItemCancel,它将发出警告…您解决了问题吗?谢谢,但我需要实现功能!谢谢,但要返回到第一个viewController,我应该做什么呢?如果您正在设置BackbarButtonim,则无需执行任何操作。如果要设置leftBarButtonItem,则需要设置分配给UINavigationController的UIBarButtonItem的目标和选择器。leftBarButtonItem在选择器中手动调用UINavigationController popViewController。