Question

我正在尝试让iPhone应用程序在iPad上运行，但是UIPopoverController是回来时有错误。

- (IBAction)photoTapped1 {
if(UI_USER_INTERFACE_IDIOM()== UIUserInterfaceIdiomPhone){
// If in editing state, then display an image picker; if not, create and push a photo view controller.
    if (self.editing) {
        UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];
        imagePicker.delegate = self;
        [self presentViewController:imagePicker animated:YES completion:nil];
        [imagePicker release];
    } else {
        RecipePhotoViewController *recipePhotoViewController = [[RecipePhotoViewController alloc] init];
        recipePhotoViewController.hidesBottomBarWhenPushed = YES;
        recipePhotoViewController.recipe = recipe;
        [self.navigationController pushViewController:recipePhotoViewController animated:YES];
        [recipePhotoViewController release];
    }
}else{
    if (self.editing){
        self.popover = [[UIPopoverController alloc] initWithContentViewController:popover];
        self.popover.delegate =self;
        [popover release];
    }else{
         RecipePhotoViewController *recipePhotoViewController = [[RecipePhotoViewController alloc] init];
         recipePhotoViewController.hidesBottomBarWhenPushed = YES;
         recipePhotoViewController.recipe = recipe;
         [self.navigationController pushViewController:recipePhotoViewController animated:YES];
         [recipePhotoViewController release];
    }}}

我得到的错误是： 'NSInvalidArgumentException'，原因：' - [UIPopoverController initWithContentViewController：]不能用nil调用。'

任何人都可以帮我解决这个问题，我已经在互联网上寻找解决方案和样本，但似乎无法使其发挥作用。

谢谢。

___ 已添加到原始问题 _ ____

我在这里添加recipePhotoViewController，我假设iPhone和iPad的ImageView操作是相同的。

my.h文件

@class Recipe;

@interface RecipePhotoViewController : UIViewController {
@private
    Recipe *recipe;
    UIImageView *imageView;
}

@property(nonatomic, retain) Recipe *recipe;
@property(nonatomic, retain) UIImageView *imageView;

@end

这是我的.m文件

@implementation RecipePhotoViewController

@synthesize recipe;
@synthesize imageView;

- (void)loadView {
self.title = @"Photo";

imageView = [[UIImageView alloc] initWithFrame:[UIScreen mainScreen].applicationFrame];
imageView.autoresizingMask = UIViewAutoresizingFlexibleHeight |      UIViewAutoresizingFlexibleWidth;
imageView.contentMode = UIViewContentModeScaleAspectFit;
imageView.backgroundColor = [UIColor blackColor];

self.view = imageView;   }
- (void)viewWillAppear:(BOOL)animated {
imageView.image = [recipe.image valueForKey:@"image"];}
- (BOOL)shouldAutorotateToInterfaceOrientation:  (UIInterfaceOrientation)interfaceOrientation  {
 return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
}
- (void)dealloc {
[imageView release];
[recipe release];
[super dealloc];
}   @end

Answer 1

您存储在变量popover中的popover的内容显然是nil。我无法看到它在您提供的代码中创建。

也许您打算将食谱照片控制器作为弹出窗口的内容。在这种情况下，你会做类似

的事情

RecipePhotoViewController *recipePhotoViewController = [[RecipePhotoViewController alloc] init];
self.popover = [[UIPopoverController alloc] initWithContentViewController:recipePhotoViewController];

Answer 2

您正在以错误的方式初始化弹出框控制器：

self.popover = [[UIPopoverController alloc] initWithContentViewController:popover];

你应该传递你想要在popover中显示的控制器 - 而不是popover本身（因为你还没有初始化它是nil）！

也许这会为你做到这一点？

    UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];
    imagePicker.delegate = self;
    self.popover = [[UIPopoverController alloc] initWithContentViewController:imagePicker];

如果这是正确的，那么您还应该呈现刚刚创建的流行音乐：– presentPopoverFromRect:inView:permittedArrowDirections:animated:

- 例如：

[self.popover presentPopoverFromRect:sender.frame inView:[self view] permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];

其中sender是以下参数：

- (IBAction)photoTapped1:(id)sender {

Answer 3

问题出在你的代码的这一行，

    self.popover = [[UIPopoverController alloc] initWithContentViewController:popover];

试试这个

    UIViewController* popoverContent = [[UIViewController alloc] init];
            UIView*   popoverView = [[UIView alloc] initWithFrame:CGRectMake(0, 400, 320, 260)];
        popoverContent.view = popoverView;
//Add what ever you want popoverView

 self.popover = [[UIPopoverController alloc] initWithContentViewController:popoverContent];
        self.popover.delegate =self;

用于iPad的UIPopoverController“不得使用`nil`”调用错误

3 个答案: