UIImagePickerController取消按鈕無法正常工作的問題

Question

我有一個通用的應用程序，允許從設備照片庫中選擇一個圖像供以后操作，代碼在iPad上工作正常，但iPhone上沒有任何反應，甚至沒有取消按鈕，選擇圖像后沒有任何事情發生我的代碼：

-(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");
}

Answer 1

而不是使用下面的代碼。

[[picker parentViewController] dismissModalViewControllerAnimated:YES];

試試這個代碼

[self dismissModalViewControllerAnimated:YES];

還檢查你的接口文件中是否添加了UIImagePickerControllerDelegate 。

解決方案:(來自我的評論）

試試這個[self.imgPicker dismissModalViewControllerAnimated:YES]; 這會奏效。

對於iOS 7：要關閉當前視圖控制器

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

Answer 2

在接口文件中添加UIImagePickerControllerDelegate

然后在.m文件中實現此代碼

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

我希望它能解決你的問題。

Answer 3

檢查調用選擇器的父控制器的viewWillAppear或viewDidAppear方法。 在iPhone上，這個方法將在選擇器視圖消失后調用。 在popover消失在iPad上后，它們不會被調用。 我剛剛在我的代碼中發現錯誤，我在viewWillAppear中為所選圖像設置nil為ivar。 我花了兩天時間來了解發生了什么;）祝你好運！

Answer 4

最簡單的解決方案：

在接口文件中添加UIImagePickerControllerDelegate

然后在.m文件中實現此代碼

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

Answer 5

Swift 3.0

感謝MBH，我在Xcode 8和iOS 10項目中為我工作：

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

Answer 6

在Swift中關閉它：

將這些協議添加到ViewController后： UINavigationControllerDelegate, UIImagePickerControllerDelegate

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