如何在iPhone的摄像头视图中导航上一个屏幕? [英] How to navigate previous screen from camera view in iphone?

问题描述

我是iPhone的新手，我在相机视图中使用自定义后退按钮并使用poptoviewcontroller，它无法正常工作，但是我想当我单击后退按钮导航到主屏幕时如何操作?请任何人帮助我.

Im new to iphone, i have custom back button in camera view and using poptoviewcontroller, its not working, but i want when i click the back button to navigate home screen, how? please any one help me.

我尝试了源代码

backbtn=[UIButton buttonWithType:UIButtonTypeCustom];
backbtn.frame=CGRectMake(40, 10, 80, 40);
[backbtn setBackgroundImage:[UIImage imageNamed:@"backspace.png"]            forState:UIControlStateNormal];
[backbtn addTarget:self action:@selector(gotoprevious)  forControlEvents:UIControlEventTouchUpInside];

[buttonView addSubview:backbtn];


-(void)gotoprevious
{
     NSLog(@"Go to prevoius screen");
 Homepage *homepage=[[Homepage alloc]init];
 [self.navigationController popToViewController:homepage animated:YES];

 }

推荐答案

要从导航控制器堆栈中删除最后一个添加的viewController，请使用:

To remove the last add viewController from the navigation controller stack use:

[self.navigationController popViewControllerAnimated:YES];

您要执行的操作将不起作用，因为您正在创建Homeview视图控制器的新实例，该实例不在堆栈中.

What you are tying to do won't work because you are creating a new instance of the Homepage view controller, which is not in the stack.

popToViewController期望一个已经在堆栈中的viewcontroller实例.

popToViewController is expecting a viewcontroller instance which is already in the stack.

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