iCloud with Core Data - Beginning iOS Cloud and Database Development - page 127

The method starts off by checking to see whether _picker has been allocated. If it has, then we
call the method dismissViewControllerAnimated:completion: to make sure the picker is not visible.
Then we assign nil to it to clear it out completely.
We use a switch statement to determine what button the user pressed. If they pressed Take
Photo, then that button's index is going to be 0 and if they pressed Choose From Library, it
will be 1. Inside of each case we instantiate the UIImagePickerController , set its delegate
to this view controller, set the source type to UIImagePickerControllerSourceTypeCamera or
UIImagePickerControllerSourceTypePhotoLibrary depending on what button they pressed, and
set allows editing to YES. We then call the method presentViewController:animated:completion:
on our self to display the UIImagePickerController .
Image Picker Delegate Methods
Now we need to add two UIImagePickerControllerDelegate methods.
#pragma mark - UIImagePickerControllerDelegate Methods
-(void)imagePickerControllerDidCancel:(UIImagePickerController *)picker {
[self dismissViewControllerAnimated:YES completion:nil];
}
-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:
(NSDictionary *)info {
UIImage *image = (UIImage *)[info objectForKey:UIImagePickerControllerEditedImage];
UIImage *resizedImage = [image resizedImage:CGSizeMake(560, 560) interpolationQuality:
kCGInterpolationHigh];
NSData *imageData = UIImagePNGRepresentation(resizedImage);
[_closeFriend setImage:imageData];
[_imgFriend setImage:resizedImage];
[self dismissViewControllerAnimated:YES completion:nil];
}
The first method, imagePickerControllerDidCancel: is called when the user cancels the image
picker. The only thing we do here is dismiss the image picker, which brings the user back to
our view.
The second method imagePickerController:didFinishPickingMediaWithInfo: is where we handle
the image the user either took or selected. Because we enabled editing, the user will be creating a
square image that we can access by using the constant UIImagePickerControllerEditedImage .
We take that image and then resize it to 560 × 560 using the method resizeImage:interpolation
Quality : that is provided in the UIImage+Resize Category on UIImage . Next we create an NSData object
using the UIImagePNGRepresentation() method and pass it the resized image. We take that NSData and
assign it to the image property of _closeFriend . Then we assign the image to the _imgFriend image
view and dismiss our image picker.