使用的UIImagePickerController问题取消按钮不工作

问题描述：

我有一个通用的应用程序，允许选择从设备的照片库*以后处理的图像，代码工作正常在iPad上，但什么也没有发生在iPhone，甚至没有取消按钮，选择图像后没有任何事情发生，这里是我的代码：使用的UIImagePickerController问题取消按钮不工作

-(IBAction)grabImage:(id)sender 
{ 
    if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) 
{ 
    imgPicker = [[UIImagePickerController alloc] init]; 
    [imgPicker setDelegate:self]; 

    popover = [[UIPopoverController alloc] initWithContentViewController:imgPicker]; 
    [popover setDelegate:self]; 

    CGPoint position  = [view1.superview convertPoint:view1.frame.origin toView:nil]; 
    CGRect popOverFrame  = CGRectMake(position.x, position.y, self.view.frame.size.width, self.view.frame.size.height); 

    [popover presentPopoverFromRect:popOverFrame inView:self.view permittedArrowDirections:nil animated:NO]; 
    [popover setPopoverContentSize:CGSizeMake(320, 480)]; 
    [imgPicker release]; 
} 
else 
{ 
    imgPicker = [[UIImagePickerController alloc] init]; 
    imgPicker.delegate = self; 
    imgPicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary; 
    [self presentModalViewController:self.imgPicker animated:YES]; 
    [imgPicker release]; 
} 
} 


-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info 
{ 
    pickedImage = [info objectForKey:UIImagePickerControllerOriginalImage]; 

CGImageRef imgRef = pickedImage.CGImage; 

    app->setImage(pickedImage, CGImageGetWidth(imgRef), CGImageGetHeight(imgRef)); 

    [[picker parentViewController] dismissModalViewControllerAnimated:YES]; 

// Enable texture siwth after an image has been loaded 
[textureSwitch setEnabled:YES]; 
[textureSwitch setOn:YES]; 
app->isTextureDrawingOn  = [textureSwitch isOn]; 

[fillsSwitch setOn:NO]; 
app->isFillsDrawingOn  = [fillsSwitch isOn]; 

    if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) 
{ 
    [popover dismissPopoverAnimated:YES]; 
} 
ofLog(OF_LOG_VERBOSE, "cancel after selection"); 
} 

-(void)imagePickerControllerDidCancel:(UIImagePickerController *)picker 
{ 
[[picker parentViewController] dismissModalViewControllerAnimated:YES]; 

if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) 
{ 
     [popover dismissPopoverAnimated:YES]; 
    } 

ofLog(OF_LOG_VERBOSE, "did cancel"); 
}

检查你是否在你的界面文件中添加uiimagepickercontrollerdelegate？ – 2012-04-21 17:21:57

虽然这不能解决您的问题，但您应该切换到使用'presentViewController：animated：completion：'和'dismissViewControllerAnimated：completion：'来代替'presentModalViewController：animated：''和'dismissModalViewControllerAnimated：'，因为后两个已弃用（请参阅[docs]（http://developer.apple.com/library/ios/#documentation/UIKit/Reference/UIViewController_Class/Reference/Reference.html））。 – 2012-04-22 09:28:06

使用[self dismissModalViewControllerAnimated：YES]读取所有建议后;确实解决了一些问题，但现在发生的情况是，具有打开图像选择器的按钮的视图消失了，有什么想法？ – 2012-04-22 13:56:03

答

而不是使用下面的代码。

[[picker parentViewController] dismissModalViewControllerAnimated:YES];

试试这个代码

[self dismissModalViewControllerAnimated:YES];

，并检查你在接口文件中添加UIImagePickerControllerDelegate。

解决方案：（从我的意见）

试试这个[self.imgPicker dismissModalViewControllerAnimated:YES]; 这将工作。

对于iOS 7：要关闭当前视图控制器

[self.imgPicker dismissViewControllerAnimated: YES completion: NULL];

使用self使所有视图消失所有我需要的是取消图像选择器视图，它工作正常iPad，但它不适用于iPhone – 2012-04-21 20:51:30

然后试试这个[self.imgPicker dismissModalViewControllerAnimated：YES]; – 2012-04-22 05:04:29

对于iOS 7，这似乎工作：[picker dismissViewControllerAnimated：YES completion：NULL]; – russes 2014-01-01 03:18:22

答

在接口文件

添加UIImagePickerControllerDelegate，然后执行该代码在你.m文件

- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker { 
    [self dismissModalViewControllerAnimated:YES]; 
}

我希望它能解决你的问题。

答

检查viewWillAppear中或调用选择器的父控制器的viewDidAppear方法。在iPhone上，这个方法将在拾取器视图消失后被调用。 Popover在iPad上消失后，它们将不会被调用。我只是在我的代码中发现错误，我在viewWillAppear中将所选图像设置为ivar。需要两天的时间才能了解发生的情况;）祝你好运！

答

一个简单的解决方案：

添加UIImagePickerControllerDelegate在接口文件

，然后在.m文件

- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker { 
    [picker dismissViewControllerAnimated:YES completion:nil]; 
}

答

实现该代码对于斯威夫特关闭它：

将这些协议添加到您之后ViewController：UINavigationControllerDelegate, UIImagePickerControllerDelegate

internal func imagePickerControllerDidCancel(picker: UIImagePickerController){ 
    dismissViewControllerAnimated(true, completion: nil) 
}

请解释它为什么可行。 – 2015-12-23 00:58:21

@RohitGupta我测试了它，它工作正常。因为我在ViewController上实现了委托'UIImagePickerControllerDelegate' – MBH 2015-12-23 06:53:47

答

雨燕3.0

由于MBH这在我的Xcode 8和iOS的10项目工作对我来说：

internal func imagePickerControllerDidCancel(_ picker: UIImagePickerController){ 
    dismiss(animated: true, completion: nil) 
}

使用的UIImagePickerController问题取消按钮不工作

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