Question

在阅读了有关UIImagePickerController的文档和sample code from apple之后，在Stackoverflow（Questions）阅读了许多教程甚至or here后，我得出结论，内置UIImagePicker能够呈现一个＆＃34;裁剪窗口＆＃34;到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＆＃34; didFinishPickingMediaWithInfo＆＃34;没有输入＆＃34; UIImagePickerControllerEditedImage＆＃34;在＆＃34; info＆＃34; -NSDictionary中。

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＆＃34; info＆＃34;：

UIImagePickerControllerOriginalImage
UIImagePickerControllerMediaMetadata
UIImagePickerControllerMediaType

别无其他。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"Crop window comes up"。该功能被删除了吗？文件是否过时或我在这里完全错了？

我还尝试从另一个answer to a similar question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，键＆＃34; UIImagePickerControllerEditedImage＆＃34;不存在于info-NSDictionary。

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框架导入项目）：

#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];

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

2 个答案: