How to make in code, the image picker

Question

How can I create the image picker in code?

I use iOS 6.0 , with ARC.

I would like to able to select the picture and somehow get UIImage of the selected image.

Answer 1

The basic instantiation goes like this

UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];
[imagePicker setDelegate:self];
imagePicker.modalPresentationStyle = UIModalPresentationOverFullScreen;
[self presentViewController:imagePicker animated:YES completion:nil];

There are three ways to get an image

//Pick from Camera
imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;//Make sure to enable permission for this in info.plist; see: https://stackoverflow.com/a/44690117/2057171

//Pick from all folders in the gallery
imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;

//Pick from PhotosAlbum(camera roll)
imagePicker.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;

Then check for the existence of the source

//Check Camera available or not
if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera])

//Check PhotoLibrary available or not
if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary]) 

//Check front Camera available or not
if ([UIImagePickerController isCameraDeviceAvailable:UIImagePickerControllerCameraDeviceFront])

You should implement the delegate protocol to get the image the user selected

//Tells the delegate that the user picked a still image or movie.
 (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
  UIImage *selectedImage = [info objectForKey:UIImagePickerControllerOriginalImage];
  [imagepicker dismissModalViewControllerAnimated:YES];
}

//Tells the delegate that the user cancelled the pick operation.
- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker
{
}

A simple Tutorial to use the UIImagePickerController

http://www.techotopia.com/index.php/An_Example_iOS_4_iPad_Camera_and_UIImagePickerController_Application_(Xcode_4)

Answer 2

<UIImagePickerControllerDelegate> add delegate to your @interface ViewController line in your.h file

make sure you have pics in your simulator if you are going to use simulator as debugger then call following methods

- (void)showImagePicker
{
    UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];
    imagePicker.delegate = self;
    imagePicker.modalPresentationStyle = UIModalPresentationOverFullScreen;
    [self presentModalViewController:imagePicker animated:YES];
}
-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    // Get the selected image.
    UIImage *image = [info objectForKey:UIImagePickerControllerOriginalImage];

    [picker dismissModalViewControllerAnimated:YES];
}
-(void)imagePickerControllerDidCancel:(UIImagePickerController *)picker
{
    [picker dismissModalViewControllerAnimated:YES];
}

Answer 3

To present it:

UIImagePickerController *picker;
picker = [[UIImagePickerController alloc] init];
[picker setDelegate:self];
[picker setSourceType:type];

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

To get the UIImage:

- (void)imagePickerController:(UIImagePickerController *)thePicker didFinishPickingMediaWithInfo:(NSDictionary *)info
{   
    // Do something with "image"
    UIImage *image = [info objectForKey:UIImagePickerControllerOriginalImage];

    // users typically expect that if they took a photo it will be saved
    if (thePicker.sourceType == UIImagePickerControllerSourceTypeCamera) {
        UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil);
    }

}