ios - why can't I access iPad photos library?

Question

I'm using IImagePickerController to get photos from the photo library. Works great on the iphone, but won't work on an iPad. There were solutions suggested to use UIpopoverController. I was using UIpopoverController in any earlier version, and I couldn't get it to work. Keep getting an error that the popoverController did not exist. Below is my code. Is there a framework that allows you to use UIPopoverController?

- (IBAction)getPhoto4:(id)sender {

    if ([UIImagePickerController isSourceTypeAvailable:
         UIImagePickerControllerSourceTypeSavedPhotosAlbum])
    {
        UIImagePickerController *imagePicker =[[UIImagePickerController alloc] init];
        imagePicker.delegate = self;
        imagePicker.sourceType =UIImagePickerControllerSourceTypePhotoLibrary;
        imagePicker.mediaTypes = @[(NSString *) kUTTypeImage ,(NSString *)kUTTypeMovie];
        imagePicker.allowsEditing = NO;
        [self presentViewController:imagePicker animated:YES completion:nil];
    }
}

#pragma mark -
#pragma mark UIImagePickerControllerDelegate

-(void)imagePickerController:(UIImagePickerController *)picker
didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    [self dismissViewControllerAnimated:YES completion:nil];
    UIImage *image = info[UIImagePickerControllerOriginalImage];

    float actualHeight = image.size.height;
    float actualWidth = image.size.width;
    float imgRatio = actualWidth/actualHeight;
    float maxRatio = 320.0/480.0;

    if(imgRatio!=maxRatio){
        if(imgRatio < maxRatio){
            imgRatio = 480.0 / actualHeight;
            actualWidth = imgRatio * actualWidth;
            actualHeight = 480.0;
        }
        else{
            imgRatio = 320.0 / actualWidth;
            actualHeight = imgRatio * actualHeight;
            actualWidth = 320.0;
        }
    }
    CGRect rect = CGRectMake(0.0, 0.0, actualWidth, actualHeight);
    UIGraphicsBeginImageContext(rect.size);
    [image drawInRect:rect];
    UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    // Get the data for the image
    NSData* imageData = UIImageJPEGRepresentation(img, 1.0);

    // Give a name to the file
    IMAGE_COUNTER = IMAGE_COUNTER + 1;
    NSString* incrementedImgStr = [NSString stringWithFormat: @"zTempDataFilePleaseDelete%d.jpg", IMAGE_COUNTER];

    NSArray* paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString* documentsDirectory = [paths objectAtIndex:0];

    // Now we get the full path to the file
    NSString* fullPathToFile2 = [documentsDirectory stringByAppendingPathComponent:incrementedImgStr];

    if(IMAGE_COUNTER == 4) {
        imageView4.image = img;
        photoHeight4 = img.size.height;
        photoWidth4 = img.size.width;
        photoPath4 = fullPathToFile2;
    }

    // and then we write it out
    [imageData writeToFile:fullPathToFile2 atomically:NO];

}

-(void)image:(UIImage *)image
finishedSavingWithError:(NSError *)error
 contextInfo:(void *)contextInfo
{
    if (error) {
        UIAlertView *alert = [[UIAlertView alloc]
                              initWithTitle: @"Save failed"
                              message: @"Failed to save image"
                              delegate: nil
                              cancelButtonTitle:@"OK"
                              otherButtonTitles:nil];
        [alert show];
    }
}


-(void)imagePickerControllerDidCancel:(UIImagePickerController *)picker1
{
    [self dismissViewControllerAnimated:YES completion:nil];
}

Answer 1

在 iPad 上，您需要显示UIImagePickerController嵌入在UIPopoverController.

您不能使用直接显示它presentViewController:

如果您正在显示相机，那么您可以使用 presentViewController，否则您需要使用弹出框在 iPad 中显示图像选择器。

参考： UIImagePickerController

---

所以而不是：

[self presentViewController:imagePicker animated:YES completion:nil];

利用：

UIPopoverController  *photoPop = [[UIPopoverController alloc]initWithContentViewController:imagePicker];
[photoPop presentPopoverFromRect:CGRectMake(100,100,300,300) inView:self.view permittedArrowDirections:UIPopoverArrowDirectionDown animated:YES];

检查这些教程：

1. UIImagePickerController
2. iPad 中的 UIImagePickerController

Answer 2

试试这个代码：在 .h 文件中实现委托

UIImagePickerControllerDelegate,UIPopoverControllerDelegate,UINavigationControllerDelegate

在 .m 文件中：

@implementation UIImagePickerController(Nonrotating)

- (BOOL)shouldAutorotate {
    return NO;
}
@end
@implementation UINavigationController (Rotation_IOS6)


-(NSUInteger) supportedInterfaceOrientations {
    return [self.topViewController supportedInterfaceOrientations];
}
-(BOOL)shouldAutorotate
{
    return [[self.viewControllers lastObject] shouldAutorotate];
}

- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation
{
    return [[self.viewControllers lastObject] preferredInterfaceOrientationForPresentation];
}
@end

-(void)photoclick
{
    UIImagePickerController *pckrImage=[[UIImagePickerController alloc]init];
            pckrImage.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;
            pckrImage.allowsEditing = YES;
            pckrImage.delegate=self;
           // UITableViewCell *cell = [tblIncident cellForRowAtIndexPath:[tblIncident indexPathForSelectedRow]];


         UIPopoverController  * poppickePhoto = [[UIPopoverController alloc]initWithContentViewController:pckrImage];

            poppickePhoto.delegate = self;
           // poppickePhoto.popoverContentSize =CGSizeMake(320,480);
            [poppickePhoto presentPopoverFromRect:yourbtn.frame inView:yourbtn.superview permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];
}

更新

  - (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {


        UIImage *choosedImage = [info objectForKey:UIImagePickerControllerOriginalImage];
        [picker dismissViewControllerAnimated:YES completion:NULL];

        yourumageview.image=choosedImage;
        [poppickePhoto dismissPopoverAnimated:YES];



    }