UIImagePickerController 的 allowEditing 属性创建问题

Question

我正在尝试使用 UIImagePickerController 拍摄图像。如果属性 allowEditing 为 NO，则一切正常。但是，一旦我将属性值更改为 YES，就不会出现图像。它同时出现在相机和库中。

以下是点击按钮打开相机时执行的代码。

if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
        UIImagePickerController *controller_imagePicker = [[UIImagePickerController alloc] init];
        [controller_imagePicker setDelegate:self];
        [controller_imagePicker setSourceType:UIImagePickerControllerSourceTypeCamera];
        [controller_imagePicker setAllowsEditing:YES];
        controller_imagePicker.modalPresentationStyle = UIModalPresentationOverCurrentContext;
        [self presentViewController:controller_imagePicker animated:YES completion:nil];
    }

当我们拍摄图像并对其进行编辑并使用图像时。黑色图像出现在相应的图像视图中。

此外，一旦相机打开，我就会收到以下警告：“对未渲染的视图进行快照会导致快照为空。请确保您的视图在快照之前或屏幕更新后的快照至少已渲染一次。”

有什么想法吗？？

Answer 1

#import <MobileCoreServices/UTCoreTypes.h>
….
if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera])
{
    UIImagePickerController *imagePickerCamera =[[UIImagePickerController alloc] init];
    imagePickerCamera.delegate = self;
    imagePickerCamera.mediaTypes = [NSArray arrayWithObjects:(NSString *) kUTTypeImage,nil];
    imagePickerCamera.allowsEditing = YES;
    imagePickerCamera.sourceType = UIImagePickerControllerSourceTypeCamera;

    [self presentViewController:imagePickerCamera  animated:YES completion:nil];
}

else if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeSavedPhotosAlbum])
{
    UIImagePickerController *imagePickerAlbum =[[UIImagePickerController alloc] init];
    imagePickerAlbum.delegate = self;
    imagePickerAlbum.mediaTypes = [NSArray arrayWithObjects:(NSString *) kUTTypeImage,nil];
    imagePickerAlbum.allowsEditing = YES;
    imagePickerAlbum.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;

    [self presentViewController:imagePickerAlbum animated:YES completion:nil];
}


#pragma mark - ImagePickerController Delegate

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

    if(UI_USER_INTERFACE_IDIOM()==UIUserInterfaceIdiomPhone) {
        [picker dismissViewControllerAnimated:YES completion:nil];
    }
    else
    {
        [popover dismissPopoverAnimated:YES];
    }


    UIImage* originalImage = nil;
    originalImage = [info objectForKey:UIImagePickerControllerEditedImage];

    if(originalImage==nil)
    {
        originalImage = [info objectForKey:UIImagePickerControllerOriginalImage];
    }

    if(originalImage==nil)
    {
        originalImage = [info objectForKey:UIImagePickerControllerCropRect];
    }
}

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

Answer 2

如果允许编辑，您应该使用 UIImagePickerControllerEditedImage 键而不是 UIImagePickerControllerOriginalImage。

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
    UIImage *image = nil;
    if ([picker allowsEditing]){
        image = [info objectForKey:UIImagePickerControllerEditedImage];
    } else {
        image = [info objectForKey:UIImagePickerControllerOriginalImage];
    }
    // do something
}