UIImagePickerController 没有在 iOS 9 中选择图像答案

【问题标题】：UIImagePickerController not picking image in iOS 9UIImagePickerController 没有在 iOS 9 中选择图像
【发布时间】：2015-12-07 11:52:58
【问题描述】：

我正在使用以下代码从相机或照片库中选择图像。在 iOS 8 中，它可以很好地选择图像。但在 iOS 9 中。选择器视图显示但不选择图像。甚至不回到控制器。点击图片什么都不做。我究竟做错了什么。

- (void)showImgaePickerViewForSourceType:(UIImagePickerControllerSourceType)sourceType
{
    UIImagePickerController *imagePickerController = [[UIImagePickerController alloc] init];
    imagePickerController.modalPresentationStyle = UIModalPresentationCurrentContext;
    imagePickerController.sourceType = sourceType;
    imagePickerController.allowsEditing = YES;
    imagePickerController.delegate = self;
    self.imgPickerController = imagePickerController;

    if (IS_IPAD) {
        [[NSOperationQueue mainQueue] addOperationWithBlock:^{
            UIPopoverController *popover = [[UIPopoverController alloc] initWithContentViewController:self.imgPickerController];
            [popover presentPopoverFromRect:CGRectMake(self.view.frame.size.width/2-200, self.view.frame.size.height/2 - 300, 400, 400) inView:self.view permittedArrowDirections:UIPopoverArrowDirectionUp animated:YES];
            self.popOver = popover;
        }];
    }else{
             [self presentViewController:self.imgPickerController animated:YES completion:NULL];
    }
}

【问题讨论】：

你实现了image picker的委托方法吗？
是的，我说它在 iOS 8 中可以正常工作。
然后向我们展示您对委托方法的实现。他们叫吗？

标签： ios objective-c uiimagepickercontroller

【解决方案1】：

UIPopoverController 在 iOS 9 中已弃用。相反，您应该使用 UIViewController 并将 modalPresentationStyle 设置为 UIModalPresentationPopover。

例如：

UIImagePickerController *imagePickerController = ...;
CGRect sourceRect = CGRectMake(self.view.frame.size.width/2-200, self.view.frame.size.height/2 - 300, 400, 400);

imagePickerController.modalPresentationStyle = UIModalPresentationPopover;
[self presentViewController:imagePickerController animated:YES completion:nil]; 
imagePickerController.popoverPresentationController.sourceRect = sourceRect;
imagePickerController.popoverPresentationController.sourceView = self.view;

注意： UIModalPresentationPopover 是在 iOS 8.0 中引入的，如果您需要支持 8.0 之前的版本，那么您需要一些条件检查才能在 iOS 7 和 iOS 8 中使用旧代码+。

注意 2： 我相信上面的技术也足够聪明，可以确定它是否应该在 iPhone 上模态显示选择器而不是弹出框（通过尺寸类）所以我不认为你需要做你的IS_IPAD检查。

【讨论】：

【解决方案2】：

我发现我的应用在其他 iPhone（无论是 iOS 8 还是 iOS 9）上运行良好。我无法从任何其他应用程序中选择图像。然后我决定重置我的 iPhone。现在一切都很完美。这不是代码问题。这是我的 iPhone 问题。

【讨论】：

刚刚遇到与发布的问题完全相同的问题...然后重新启动了我的手机...它成功了！ o.O

【解决方案3】：

使用此代码在 ios 9 中运行良好。我正在使用操作表显示 2 个选项可供选择。

   -(IBAction)imagepickertapped:(id)sender
   {
       UIActionSheet *popup = [[UIActionSheet alloc] initWithTitle:nil delegate:self cancelButtonTitle:@"Cancel" destructiveButtonTitle:@"Take Photo" otherButtonTitles:@"Photo Library",nil];

       popup.tag =909;
       popup.actionSheetStyle = UIActionSheetStyleBlackTranslucent;
      [popup showInView:self.view];

   }
   -(void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex {


    if (actionSheet.tag ==909)
{

    if (buttonIndex == 0)
    {

        if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera])
        {
            UIImagePickerController* picker = [[UIImagePickerController alloc] init];
            picker.sourceType = UIImagePickerControllerSourceTypeCamera;
            // picker.mediaTypes = [[NSArray alloc] initWithObjects:(NSString *)kUTTypeMovie,kUTTypeImage,nil];

            picker.delegate = self;
            [self presentViewController:picker animated:YES completion:NULL];
        }
        else
        {


            UIAlertView *altnot=[[UIAlertView alloc]initWithTitle:@"Camera Not Available" message:nil delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
            [altnot show];

        }

    } else if (buttonIndex == 1) {

        UIImagePickerController *picker = [[UIImagePickerController alloc] init];
        //picker.mediaTypes = [[NSArray alloc] initWithObjects:(NSString *)kUTTypeMovie,kUTTypeImage,nil];

        picker.delegate = self;
        picker.editing = YES;
        picker.allowsEditing = YES;

        picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
        [self presentViewController:picker animated:YES completion:NULL];
    }

}


 }

   - (void)imagePickerController:(UIImagePickerController *)picker
    didFinishPickingImage:(UIImage *)image
              editingInfo:(NSDictionary *)editingInfo{


   [picker dismissViewControllerAnimated:YES completion:NULL];


imagedata = UIImageJPEGRepresentation(image, 0.3);


Userimage.image = image;


 }

IPAD请参考此链接

find here

【讨论】：

【解决方案4】：

按照下面的编码

- (void)imagePicker
{

   UIImagePickerController *picker = [[UIImagePickerController alloc] init];
   picker.delegate = self;
   picker.allowsEditing = YES;
   picker.sourceType = UIImagePickerControllerSourceTypeCamera;
   [self presentViewController:pickerTakePhoto animated:YES completion:nil];
}

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
   UIImage *imagePicked = info[UIImagePickerControllerEditedImage];
   picker.delegate = self;
   [picker dismissViewControllerAnimated:YES completion:nil];
}
- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker 
{
   [picker dismissViewControllerAnimated:YES completion:NULL];
}

【讨论】：

【解决方案5】：

由于不推荐使用操作表并且需要使用 UIAlertController，因此我正在写一个类似的答案以供新手使用：

    - (IBAction)attachImageTapped:(id)sender
{
    UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"Attach image" message:@"" preferredStyle:UIAlertControllerStyleActionSheet];
    UIAlertAction* pickFromGallery = [UIAlertAction actionWithTitle:@"Take a photo"
                                                              style:UIAlertActionStyleDefault
                                                          handler:^(UIAlertAction * action) {
                                                              if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera])
                                                              {
                                                              UIImagePickerController* picker = [[UIImagePickerController alloc] init];
                                                              picker.sourceType = UIImagePickerControllerSourceTypeCamera;
                                                              picker.delegate = self;
                                                              [self presentViewController:picker animated:YES completion:NULL];
                                                              }

                                                          }];
    UIAlertAction* takeAPicture = [UIAlertAction actionWithTitle:@"Choose from gallery"
                                                              style:UIAlertActionStyleDefault
                                                            handler:^(UIAlertAction * action) {
                                                                UIImagePickerController* picker = [[UIImagePickerController alloc] init];
                                                                picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
                                                                picker.delegate = self;
                                                                [self presentViewController:picker animated:YES completion:NULL];
                                                            }];
    UIAlertAction* cancel = [UIAlertAction actionWithTitle:@"Cancel"
                                                           style:UIAlertActionStyleCancel
                                                         handler:^(UIAlertAction * action) {
                                                         }];

    [alertController addAction:pickFromGallery];
    [alertController addAction:takeAPicture];
    [alertController addAction:cancel];
    [self presentViewController:alertController animated:YES completion:nil];
}

-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info
{
    UIImage *imagePicked = info[UIImagePickerControllerOriginalImage];
    [picker dismissViewControllerAnimated:YES completion:nil];
}

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

【讨论】：

【解决方案6】：

请按照以下步骤从库中选择图像，您可以使用“UIAlertController”从相机中获取图像，您只需将以下代码放入您的按钮点击事件中

- (IBAction)yourButtonClickEvent:(id)sender {

UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"Attach image" message:@"" preferredStyle:UIAlertControllerStyleActionSheet];
UIAlertAction* pickFromGallery =
[UIAlertAction actionWithTitle:@"Take a photo"
                         style:UIAlertActionStyleDefault
                       handler:^(UIAlertAction * action) {
            if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]){
                UIImagePickerController* picker = [[UIImagePickerController alloc] init];
                picker.sourceType = UIImagePickerControllerSourceTypeCamera;
                picker.delegate = self;
                [self presentViewController:picker animated:YES completion:NULL];
                                                            }

                                                        }];
UIAlertAction* takeAPicture =
[UIAlertAction actionWithTitle:@"Choose from gallery"
                         style:UIAlertActionStyleDefault
                       handler:^(UIAlertAction * action) {
    UIImagePickerController* picker = [[UIImagePickerController alloc] init];
    picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
    picker.delegate = self;
    [self presentViewController:picker animated:YES completion:NULL];
                                                     }];
UIAlertAction* cancel = [UIAlertAction actionWithTitle:@"Cancel"
                    style:UIAlertActionStyleCancel
                  handler:^(UIAlertAction * action) {
        }];

[alertController addAction:pickFromGallery];
[alertController addAction:takeAPicture];
[alertController addAction:cancel];
[self presentViewController:alertController animated:YES completion:nil];

}

然后你只要把 UIImagePicker 委托方法如下：

 -(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info

{
UIImage *imagePicked = info[UIImagePickerControllerOriginalImage];
self.imgForUpaloadDocument.image = imagePicked;
[picker dismissViewControllerAnimated:YES completion:nil];

if(picker.sourceType == UIImagePickerControllerSourceTypeCamera)
{
    UIImageWriteToSavedPhotosAlbum(imagePicked, nil, nil, nil);
}
}


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

【讨论】：

【解决方案7】：

使用上面的代码，我想添加一些你可能需要实现 uiimage picker viewcontroller 的东西。

如果您想防止应用崩溃，您需要说明您访问相机、照片库等的原因。这是 iOS10 中的新功能。

将以下内容输入到您的 Info.plist 文件中。

照片

键：隐私 - 照片库使用说明值：$(PRODUCT_NAME) 照片使用

相机

键：隐私 - 相机使用说明值：$(PRODUCT_NAME) 相机使用

【讨论】：