拍照后编辑图像

我目前正在制作一个 iPhone 应用程序，用户可以在其中拍照或从相册中选择照片，然后将覆盖层放置在图像上。然后用户可以缩放、旋转和保存图像。目前，我可以拍照，或者选择一张放入相册。至于覆盖层，我只是使用 UIImageView 并将其放置在界面构建器中的层次结构的顶部。对于相机，我使用以下代码：

-(IBAction)getPhoto:(id)sender  {

// Create an image picker controller
UIImagePickerController * imagePicker = [[UIImagePickerController alloc] init];


if((UIButton *) sender == choosePhotoBtn)   {
    // Set source to photo albums
    imagePicker.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;
}

else    {
    // Set source to camera
    imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;
    imagePicker.showsCameraControls = YES;
}

// Delegate is self
imagePicker.delegate = self;

    // Allow editing of image
    imagePicker.allowsEditing = YES;

    // Show image picker
    [self presentModalViewController:imagePicker animated: YES];
}

-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info   {
// Dismiss modalviewcontroller
[picker dismissModalViewControllerAnimated:YES];

// Displaying image to the imageView
imageView.image = [info objectForKey:@"UIImagePickerControllerOriginalImage"];

// Access the uncropped image from info dictionary
UIImage * image = [info objectForKey:@"UIImagePickerControllerOriginalImage"];


// Save Image
UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil);

[picker release];
}

我现在遇到的问题是拍摄照片后对其进行编辑。如何自定义相机以使其表现如下？：

1. 选择使用相机或从相册中获取照片

2. 一旦选择，覆盖图像将变为我在脸上放置一个“圆圈”的图像，照片将像面具一样位于下面。该视图还可以全屏编辑。您可以旋转、缩放和移动图像，直到单击“完成”。

我已经阅读了手册中的这一部分，但我似乎不明白如何使用它。http://developer.apple.com/library/ios/#documentation/UIKit/Reference/UIImagePickerController_Class/UIImagePickerController/UIImagePickerController.html http://developer.apple.com/library/ios/#documentation/UIKit/Reference/UIImagePickerController_Class/UIImagePickerController/UIImagePickerController.html

希望有人能指出我正确的方向。

非常感谢。 -哈基莫

有一种方法不需要太多改变你的代码：

- (IBAction)takePicture:(id)sender {
UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];
if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
    [imagePicker setSourceType:UIImagePickerControllerSourceTypeCamera];
} else {
    [imagePicker setSourceType:UIImagePickerControllerSourceTypePhotoLibrary];
}

[imagePicker setAllowsEditing:YES];
[imagePicker setDelegate:self];

//place image picker on the screen
[self presentViewController:imagePicker animated:YES completion:nil];
}

如果你想使用编辑后的图片，请将“UIImagePickerControllerOriginalImage”更改为“UIImagePickerControllerEditedImage”，就可以了！