UIImagePickerController + Cropping：allowEditing是什么，它不是什么？

Question

在阅读了关于UIImagePickerController的Apple的文档和示例代码之后，在Stackoverflow（ 或此处 ）阅读了许多教程甚至问题后 ，我得出结论，内置的UIImagePicker能够呈现“裁剪窗口”用户并让用户裁剪并移动他想要使用的图像的右侧部分。

但是在iOS 7.1上查看这些示例，似乎没有裁剪窗口。 什么都没有让用户裁剪出拍摄图像的一部分。 所有测试都发生在真实硬件（iPhone 5S）上，因为缺少相机而没有使用iPhone模拟器;）

此外，在委托方法“didFinishPickingMediaWithInfo”中，“info”-NSDictionary中没有“UIImagePickerControllerEditedImage”条目。

我做了什么：

    UIImagePickerController *imagePickerController = [[UIImagePickerController alloc] init];

#if TARGET_IPHONE_SIMULATOR
    // iPhone-Simulator has no camera, just save images to the photoalbum on the simulator to use them here
    imagePickerController.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
#else
    imagePickerController.sourceType = UIImagePickerControllerSourceTypeCamera;
#endif

    imagePickerController.editing = YES;
    imagePickerController.delegate = (id)self;
    imagePickerController.cameraCaptureMode = UIImagePickerControllerCameraCaptureModePhoto;


    [self presentModalViewController:imagePickerController animated:YES];

和委托方法：

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

此时，字典中只有3个键可用，名称为“info”：

• UIImagePickerControllerOriginalImage
• UIImagePickerControllerMediaMetadata
• UIImagePickerControllerMediaType

没有其他的。 此外，没有出现裁剪窗口或任何类似控件。

我对ImagePicker行为的期望是错误的吗？ 在此SF-Question中，用户编写了“裁剪窗口出现” 。 该功能被删除了吗？ 文件是否过时或我在这里完全错了？

我也尝试从另一个类似问题的答案中获取此代码：

- (void)    imagePickerController:(UIImagePickerController *)picker 
    didFinishPickingMediaWithInfo:(NSDictionary *)info 
{
    [picker dismissViewControllerAnimated:YES completion:^{
          // Edited image works great (if you allowed editing)
        UIImage *image = [info objectForKey:UIImagePickerControllerEditedImage];
          // AND the original image works great
        UIImage *originalImage = [info objectForKey:UIImagePickerControllerOriginalImage];
          // AND do whatever you want with it, (NSDictionary *)info is fine now
        UIImage *myImage = [info objectForKey:UIImagePickerControllerEditedImage];
    }];
}

没有出现裁剪窗口，info-NSDictionary上没有关键字“UIImagePickerControllerEditedImage”。

有人可以解释我正确的行为吗？ 非常感谢你提前。

Answer 1

这个对我有用：

-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    UIImage *originalImage, *editedImage;

    editedImage = (UIImage *) [info objectForKey:UIImagePickerControllerEditedImage];
    originalImage = (UIImage *) [info objectForKey:UIImagePickerControllerOriginalImage];

    if (editedImage)
        self.profilePictureImageView.image = editedImage;
    else
        self.profilePictureImageView.image = originalImage;

    [picker dismissViewControllerAnimated:YES completion:nil];
}

Answer 2

首先确保导入以下头文件（必须将MobileCoreServices框架导入到项目中）：

#import <MobileCoreServices/UTCoreTypes.h>

然后尝试以下代码

    UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];

#if TARGET_IPHONE_SIMULATOR
    if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeSavedPhotosAlbum]){
        imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
    }
#else
    if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]){
        imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;
    }
#endif

    imagePicker.mediaTypes = @[(NSString *)kUTTypeImage];
    imagePicker.allowsEditing = YES;
    imagePicker.delegate = self;

    //[self presentModalViewController:imagePicker animated:YES]; <-- This method is deprecated use the following instead

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