How to create a subview that will be a popup on large devices and full screen on small ones in iOS 6 with ARC

Universal apps are becoming more and more necessary today. They are becoming more complicated as well. At least they don't hundreds of different size screens to deal with like android.

First you should have a subview that is the size of a standard smaller screen (itouch, iphone). We will call this "SearchViewController".  You might want to use a delegate to interact with the views but we won't worry about that in this exercise.

in the SearchViewController.m;

-(void) closeView{
    //all keyboard items should have "resignFirstResponder" attached to it here just in case
    [self.view removeFromSuperview];
}

in the MainViewController.h;

#import "SearchViewController.h"

@interface MainViewController <UIPopoverControllerDelegate>{
    SearchViewController *searcher;
}

in the MainViewController.m;

-(void)OpenSearch{

    static bool isSearchOpen = FALSE;

    //open up the subview for the search function. Open up as a mini view for the ipad and a full window view for the iphone.

    if (isSearchOpen == FALSE){

        isSearchOpen = TRUE;

        if (searcher == nil){

            searcher = [[SearchViewController alloc]init];

            searcher.delegate = self;

            if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone){

                CGRect frame = searcher.view.frame;

                searcher.view.frame = CGRectMake(0, 0, frame.size.width, frame.size.height-88);

            }

        }

        if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone){

            //iphone

            [self addChildViewController:searcher];

            [self.view addSubview:searcher.view];

            [searcher didMoveToParentViewController:self];

        }else{

            //ipad

            popSearch = [[UIPopoverController alloc] initWithContentViewController:searcher];

            popSearch.popoverContentSize = searcher.view.frame.size;

            popSearch.delegate = self;

            [popSearch presentPopoverFromRect:CGRectMake(self.view.frame.size.width - 5,0, 10, 10) inView:self.view permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];

        }

    }else{

        isSearchOpen = FALSE;

        [self closeSearch];

    }    

}

-(void)closeSearch{

    //cancels the search and closes the search view

    if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone){

        [searcher.view removeFromSuperview];

    }else{

        [popSearch dismissPopoverAnimated:YES];

    }

    isSearchOpen = FALSE;

}

Done :)

iOS Creating Custom Delegates in iOS6 with ARC

So you want two Objects to talk to each other more than a little bit? Here is what to do by example.  Lets say we have our MainViewController and a new SearchViewController that you want a delegate attached to it. This is all you need to do.

In SearchViewController.h

@protocol SearchViewDelegate <NSObject>

@optional

@required

-(void)didAskToSearch:(NSString*)string;

@end

@interface SearchViewController : UIViewController {

}

@property (nonatomic, assign) id <SearchViewDelegate> delegate;

@end

optional has non-required methods and required of course has required methods. 

In SearchViewController.m;

    [_delegate didAskToSearch: [self searchRequestDetails]];

this is put anywhere in the code when you want it to send the information back to the other object. 

In the MainViewController.h;

@interface MainViewController : UIViewController <SearchViewDelegate> {

}

In MainViewController.m;

SearchViewController *searcher = [[SearchViewController alloc]init];

searcher.delegate = self;

#pragma mark - SearchViewControllerDelegates

-(void)didAskToSearch:(NSString*)string{

     //do whatever you want with the string results

}

When creating the object, make sure the tell the delegate you have those methods. Then you just have to create the methods as per it is required. 

Helpful link
http://stackoverflow.com/questions/12020539/how-to-make-custom-delegate-in-ios-app

Import and Export data via email

Reference: How To Import and Export App Data Via Email in your iOS App

iOS6 Getting image from Photo Library

What you would need to do to capture a image from a local photo library.

First ensure that the controller you create works these delegates;

<UIImagePickerControllerDelegate, UINavigationControllerDelegate>

Method to Start request to grab the image;

- (void) useCameraRoll:(id)sender
{
    if ([UIImagePickerController isSourceTypeAvailable:
          UIImagePickerControllerSourceTypeSavedPhotosAlbum])
    {
       UIImagePickerController *imagePicker =
           [[UIImagePickerController alloc] init];
       imagePicker.delegate = self;
       imagePicker.sourceType =
           UIImagePickerControllerSourceTypePhotoLibrary;
        imagePicker.mediaTypes = @[(NSString *) kUTTypeImage];
       imagePicker.allowsEditing = NO;
       [self presentViewController:imagePicker 
           animated:YES completion:nil];
       _newMedia = NO;
    }
}

Delegate Methods to Receive the Image;

#pragma mark -
#pragma mark UIImagePickerControllerDelegate

-(void)imagePickerController:(UIImagePickerController *)picker
didFinishPickingMediaWithInfo:(NSDictionary *)info
{
   NSString *mediaType = info[UIImagePickerControllerMediaType];

   [self dismissViewControllerAnimated:YES completion:nil];

    if ([mediaType isEqualToString:(NSString *)kUTTypeImage]) {
        UIImage *image = info[UIImagePickerControllerOriginalImage];

        _imageView.image = image;
        if (_newMedia)
            UIImageWriteToSavedPhotosAlbum(image,
               self,
               @selector(image:finishedSavingWithError:contextInfo:),
               nil);
        }
        else if ([mediaType isEqualToString:(NSString *)kUTTypeMovie])
        {
                // Code here to support video if enabled
        }
}

-(void)image:(UIImage *)image
finishedSavingWithError:(NSError *)error
contextInfo:(void *)contextInfo
{
   if (error) {
        UIAlertView *alert = [[UIAlertView alloc]
           initWithTitle: @"Save failed"
           message: @"Failed to save image"
           delegate: nil
           cancelButtonTitle:@"OK"
           otherButtonTitles:nil];
        [alert show];
   }
}

-(void)imagePickerControllerDidCancel:(UIImagePickerController *)picker
{
   [self dismissViewControllerAnimated:YES completion:nil];
}

References:  Accessing the iPhone Camera and Photo Library (iOS 6)