PushViewController 和 popToRootViewController

Question

我的应用程序正在使用pushViewController以模态方式显示导航控制器

 [navigationController pushViewController:_viewController animated:YES];

导航控制器已完成按钮

UIButton* backButton = [UIButton buttonWithType:101]; 
[backButton addTarget:self action:@selector(dismissView:) forControlEvents:UIControlEventTouchUpInside];
[backButton setTitle:@"Done" forState:UIControlStateNormal];

UIBarButtonItem* backItem = [[UIBarButtonItem alloc] initWithCustomView:backButton];

self.navigationItem.leftBarButtonItem = backItem;
[backItem release];

当按下完成按钮时我希望它应该导航回主窗口

-(void) dismissView: (id)sender

{
    [self.navigationController popToRootViewControllerAnimated:YES];
//[self.navigationController popToViewController:_viewController animated:YES];

}

但是当我按下完成按钮时什么也没有发生。这是为什么？

Answer 1

请在您的 dissmissView 中 NSLog

-(void) dismissView: (id)sender

{
   NSLog(@"Hii....");
    [self.navigationController popToRootViewControllerAnimated:YES];
//[self.navigationController popToViewController:_viewController animated:YES];

}

或使用断点调试应用程序。

Answer 2

UIButton* backButton = [UIButton buttonWithType:101];

我很确定“101”无效，

+ (id)buttonWithType:(UIButtonType)buttonType

您应该使用以下 UIButtonType 值之一

typedef enum {
    UIButtonTypeCustom = 0,
    UIButtonTypeRoundedRect,
    UIButtonTypeDetailDisclosure,
    UIButtonTypeInfoLight,
    UIButtonTypeInfoDark,
    UIButtonTypeContactAdd,
} UIButtonType;

，而不是测试您的代码，在您的missView中放入一些 NSLog：以查看它是否被调用