从图像选择器返回时如何更改视图控制器？

Question

我试图做一些简单：

1. 从控制器MAViewControllerMenu我可以选择一个现有的图片
2. 选择后，我在返回到MAViewControllerMenu返回MAViewControllerMenu通过驳回选择器视图
3. 权，我想切换到另一个控制器MAViewControllerPictureDisplay，我可以在其中查看在imageView中选择的图像。

但是，它不会把我带到下一个视图。

下面是MAViewControllerMenu代码

MAViewControllerPictureDisplay* imageControllerView; 
- (void)viewDidLoad 
{ 

    [super viewDidLoad]; 
    // Do any additional setup after loading the view. 
    //load next page 
    imageControllerView = [[self storyboard]  instantiateViewControllerWithIdentifier:@"chosenImageController"]; 
} 



-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info 
{ 
    image = [info objectForKey:UIImagePickerControllerOriginalImage];//Take image from picker 
    imageControllerView.image = image;//set it for the next controller's property 
    [self dismissViewControllerAnimated:YES completion:^{ 
    [self.presentingViewController presentModalViewController:imageControllerView 
                animated:YES]; 
}]; 
    //NEXT LINE DOESNT WORK 
    [self presentViewController:imageControllerView animated:YES completion:nil];//THAT DOESNT WORK 
} 

然而，我在我的第一个控制器中设置的按钮时，在一个点击运行该线之上通过函数如下，和一个不带我去下一个控制器：

- (IBAction)movetonext{ 
    [self presentViewController:imageControllerView animated:YES completion:nil]; 
} 

我错过了什么？为什么在点击按钮时调用它，但在没有触摸事件的情况下调用时，在选择图片后不起作用？

感谢

Answer 1

试试这个：

相反POPING的UIViewController，然后呈现。推两个视图控制器，并弹出一个。

当你调用选择器：

[self presentViewController:imageControllerView animated:NO completion:nil]; 
    [self presentViewController:PickerController animated:YES completion:nil]; 

而且当您关闭：

[Picker dismissViewControllerAnimated:YES completion:NULL]; 

需要注意的是，当我调用两个UIViewController中提出，为他们赢得了（还没有到呈现的一个）被设置为“NO”的动画。

希望这有助于

编辑

上面的代码，只有UINaviationController作品，由 “PushViewController” 和 “PopViewController”。

实现这一点，我发现只有两个方法是：

1 - 如果用户NSNotificationCenter解雇你middel视图，如下所示：

Dismiss 2 modal view controllers

不幸的是，你

，它不是相同的情况下，所以我想为你使用UINaviationController 的方式，是使用UIImagePicker的子视图，即解散他的自己..

2 - 知道这是一种黑客，但它的工作原理！如果你打电话来介绍middel UIViewController，没有动画，并从该视图调用图像选择器，它将工作。并且您将不得不将选取的图像进行委托。 我加入到我的代码，为middel的UIViewController有一个Alpha设置为0的第一次，所以你不会注意到，他是韩元如何呈现：

//First UIViewController: 

@implementation ViewControllerOne 
- (IBAction)buttonPressed:(id)sender { 

    ViewControllerTwo *viewTwo = [[ViewControllerTwo alloc]init]; 
    [self presentViewController:viewTwo animated:NO completion:nil]; 
} 

//Secound UIViewController: 
     @interface ViewControllerTwo() 
     @property (nonatomic) UIImagePickerController *myPicker; 
     @end 
     @implementation ViewControllerTwo 

     -(void)viewWillAppear:(BOOL)animated 
     { 
     //View to alph 0 if this is the first time it displayis: 
     if (!self.myPicker) { 
     [self.view setAlpha:0]; 
     }else{ 
     [self.view setAlpha:1]; 
     } 
     } 
     -(void)viewDidAppear:(BOOL)animated{ 

     if (!self.myPicker) { 
     self.myPicker = [[UIImagePickerController alloc]init]; 
     self.myPicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary; 
     self.myPicker.delegate = self; 
     [self presentViewController:self.myPicker animated:YES completion:nil]; 
     } 
     } 
     - (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo: (NSDictionary *)info 
     { 
    [self.myPicker dismissViewControllerAnimated:YES completion:nil]; 
     } 
     - (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker 
     { 
    [self.myPicker dismissViewControllerAnimated:YES completion:NO]; 
     } 
     - (IBAction)ButtonTwoClicked:(id)sender { 
     [self dismissViewControllerAnimated:YES completion:NO]; 
    } 

Answer 2

利用completion处理程序：

-(void)imagePickerController:(UIImagePickerController *)picker 
            didFinishPickingMediaWithInfo:(NSDictionary *)info { 
[self dismissViewControllerAnimated:YES completion:^{ 
    image = [info valueForKey:UIImagePickerControllerOriginalImage]; 
    imageControllerView.image = image; 
    [self presentViewController:imageControllerView animated:YES completion:nil]; 
}]; 
} 

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DEMO