EditingViewController.m

/*
     File: EditingViewController.m
 Abstract: A generic view controller responsible for editing a field 
 of data (text or date).  The controller defines a protocol to communicate 
 changes to the view controller that manages the object being edited.
 
  Version: 1.2
 
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 */
 
#import "EditingViewController.h"
 
@interface EditingViewController ()
/// Things for IB
@property (nonatomic, weak) IBOutlet UITextField *textField;
@property (nonatomic, weak) IBOutlet UIDatePicker *datePicker;
@end
 
 
@implementation EditingViewController
 
#pragma mark - View lifecycle
 
// -------------------------------------------------------------------------------
//  viewWillAppear:
// -------------------------------------------------------------------------------
- (void)viewWillAppear:(BOOL)animated
{   
    [super viewWillAppear:animated];
    
    // Set the title to the user-visible name of the field.
    self.title = self.editedPropertyDisplayName;
    
    // Update user interface according to state.
    if (self.editingDate)
    {
        // Display the date picker.
        self.textField.hidden = YES;
        self.datePicker.hidden = NO;
        
        // Use KVC to retrieve the current date associated with editedPropertyKey
        // of editedObject.
        NSDate *date = [self.editedObject valueForKey:self.editedPropertyKey];
        if (date == nil) date = [NSDate date];
        self.datePicker.date = date;
    }
    else
    {
        // Display the text field.
        self.textField.hidden = NO;
        self.datePicker.hidden = YES;
        
        // Use KVC to retrieve the current string associated with editedPropertyKey
        // of editedObject.
        self.textField.text = [self.editedObject valueForKey:self.editedPropertyKey];
        self.textField.placeholder = self.title;
        [self.textField becomeFirstResponder];
    }
}
 
#pragma mark - Rotation
 
#if __IPHONE_OS_VERSION_MIN_REQUIRED < __IPHONE_6_0
// -------------------------------------------------------------------------------
//  shouldAutorotateToInterfaceOrientation:
//  Disable rotation on iOS 5.x and earlier.  Note, for iOS 6.0 and later all you
//  need is "UISupportedInterfaceOrientations" defined in your Info.plist
// -------------------------------------------------------------------------------
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    return (interfaceOrientation == UIInterfaceOrientationPortrait);;
}
#endif
 
#pragma mark - IB Actions
 
// -------------------------------------------------------------------------------
//  save
//  IBAction for the Save bar button item.
// -------------------------------------------------------------------------------
- (IBAction)save
{
    // Pass the current value to the source controller, then pop.
    if (self.editingDate)
        [self.sourceController setValue:self.datePicker.date forEditedProperty:self.editedPropertyKey];
    else
        [self.sourceController setValue:self.textField.text forEditedProperty:self.editedPropertyKey];
    
    [self.navigationController popViewControllerAnimated:YES];
}
 
// -------------------------------------------------------------------------------
//  cancel
//  IBAction for the Cancel bar button item.
// -------------------------------------------------------------------------------
- (IBAction)cancel
{
    // Don't pass the current value to the edited object, just pop.
    [self.navigationController popViewControllerAnimated:YES];
}
 
@end