Classes/RecipeDetailViewController.m

/*
     File: RecipeDetailViewController.m 
 Abstract: The UITableViewController for displaying the details of a Recipe 
  Version: 1.2 
  
 Disclaimer: IMPORTANT:  This Apple software is supplied to you by Apple 
 Inc. ("Apple") in consideration of your agreement to the following 
 terms, and your use, installation, modification or redistribution of 
 this Apple software constitutes acceptance of these terms.  If you do 
 not agree with these terms, please do not use, install, modify or 
 redistribute this Apple software. 
  
 In consideration of your agreement to abide by the following terms, and 
 subject to these terms, Apple grants you a personal, non-exclusive 
 license, under Apple's copyrights in this original Apple software (the 
 "Apple Software"), to use, reproduce, modify and redistribute the Apple 
 Software, with or without modifications, in source and/or binary forms; 
 provided that if you redistribute the Apple Software in its entirety and 
 without modifications, you must retain this notice and the following 
 text and disclaimers in all such redistributions of the Apple Software. 
 Neither the name, trademarks, service marks or logos of Apple Inc. may 
 be used to endorse or promote products derived from the Apple Software 
 without specific prior written permission from Apple.  Except as 
 expressly stated in this notice, no other rights or licenses, express or 
 implied, are granted by Apple herein, including but not limited to any 
 patent rights that may be infringed by your derivative works or by other 
 works in which the Apple Software may be incorporated. 
  
 The Apple Software is provided by Apple on an "AS IS" basis.  APPLE 
 MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION 
 THE IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS 
 FOR A PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND 
 OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS. 
  
 IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL 
 OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 
 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
 INTERRUPTION) ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION, 
 MODIFICATION AND/OR DISTRIBUTION OF THE APPLE SOFTWARE, HOWEVER CAUSED 
 AND WHETHER UNDER THEORY OF CONTRACT, TORT (INCLUDING NEGLIGENCE), 
 STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN ADVISED OF THE 
 POSSIBILITY OF SUCH DAMAGE. 
  
 Copyright (C) 2014 Apple Inc. All Rights Reserved. 
  
 */ 
 
 
#import "RecipeDetailViewController.h"
#import "RecipesController.h"
#import "Recipe.h"
#import "InstructionsViewController.h"
#import "RecipePhotoViewController.h"
 
 
@interface RecipeDetailViewController ()
 
@property (nonatomic, strong) IBOutlet UIView *tableHeaderView;
@property (nonatomic, strong) IBOutlet UIButton *photoButton;
@property (nonatomic, strong) IBOutlet UILabel *nameLabel;
 
@property (nonatomic, strong) Recipe *recipe;
 
- (IBAction)showPhoto;
@end
 
 
@implementation RecipeDetailViewController
 
// Define constants for the table view sections
enum {
    INGREDIENTS_SECTION, // 0
    INSTRUCTIONS_SECTION, // 1
    TotalNumberOfSections // 2
};
 
// Custom initialize that makes the recipe available to this table view controller
-(RecipeDetailViewController*)initWithRecipe:(Recipe*)aRecipe;
{
    self = [super initWithStyle:UITableViewStyleGrouped];
    if(self){
        self.recipe = aRecipe;
        self.navigationItem.title = @"Recipe";
    }
    return self;
}
 
// Release ownership.
 
#pragma mark -
#pragma mark UIViewController
 
// Release ownership.
- (void) viewDidUnload;
{
    self.tableHeaderView = nil;
    self.photoButton = nil;
    self.nameLabel = nil;
}
 
 
- (void)viewDidLoad {
    if (_tableHeaderView == nil) {
        
        // Load the header view that shows the recipe name and thumbnail
        [[NSBundle mainBundle] loadNibNamed:@"DetailHeaderView" owner:self options:nil];
        _tableHeaderView.backgroundColor = [UIColor groupTableViewBackgroundColor];
        
        // Set it onto the tables header view property
        self.tableView.tableHeaderView = _tableHeaderView;
        self.tableView.allowsSelectionDuringEditing = YES;
    }
}
 
- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];
    
    // to update recipe type and ingredients on return
    [self.tableView reloadData]; 
    
    // Skin the photo button with the recipe thumbnail - displayed up in the header view
    [_photoButton setImage:_recipe.thumbnailImage forState:UIControlStateNormal];
    // Set the header view text
    _nameLabel.text = _recipe.name;
    
    // Set the recipe name as the nav bar title
    self.title = _recipe.name;
    
    // Provide a back button to go back to the recipes
    UIBarButtonItem *backButton = [[UIBarButtonItem alloc] initWithTitle:@"Recipe" style:UIBarButtonItemStylePlain target:nil action:nil];
    self.navigationItem.backBarButtonItem = backButton;
}
 
// Support all orientations except portrait-upside down
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
    return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
}
 
#pragma mark -
#pragma mark UITableView Delegate/Datasource
 
// Provide the architecture with the number of sections in this table view. 2 for this sample.
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
    return TotalNumberOfSections;
}
 
// Define a title for the argument section
- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section {
    switch (section) {
            // Only define a title for the ingredients section
        case INGREDIENTS_SECTION:
            return @"Ingredients";
        default:
            return nil;
    }
}
 
// Provide the architecture with the number of rows for the argument section
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    switch (section) {
        case INSTRUCTIONS_SECTION:
            return 1;
        case INGREDIENTS_SECTION:
            return [_recipe.ingredients count];
        default:
            return 0;
    }
}
 
// Build the cell for the argument cell index.
// See the TableViewSuite sample for more information about creating table view cells.
- (UITableViewCell *)ingredientsCellAtIndex:(NSUInteger)ingredientIdx forTableView:(UITableView *)tableView {
        static NSString *IngredientsCellIdentifier = @"IngredientsCell";
        const int AMOUNT_TAG =  1;
        UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:IngredientsCellIdentifier];
        if (cell == nil) {
            cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:IngredientsCellIdentifier];
            
            UILabel *amountLabel = [[UILabel alloc] initWithFrame:CGRectZero];
            [amountLabel setAutoresizingMask:UIViewAutoresizingFlexibleLeftMargin];
            amountLabel.tag = AMOUNT_TAG;
            amountLabel.textColor = [UIColor colorWithRed:50.0/255.0 green:79.0/255.0 blue:133.0/255.0 alpha:1.0];
            amountLabel.highlightedTextColor = [UIColor whiteColor];
            [cell.contentView insertSubview:amountLabel aboveSubview:cell.textLabel];
            amountLabel.backgroundColor = [UIColor clearColor];
        }
        
        UILabel *amountLabel = (UILabel *)[cell viewWithTag:AMOUNT_TAG];
        
        NSDictionary *ingredients = [_recipe.ingredients objectAtIndex:ingredientIdx];
        cell.textLabel.text = [ingredients objectForKey:@"name"];
        amountLabel.text = [ingredients objectForKey:@"amount"];        
        
        CGSize desiredSize = [amountLabel sizeThatFits:CGSizeMake(160.0,32.0)];
        CGRect computedFrame = {CGPointMake(CGRectGetMaxX(cell.contentView.bounds) - desiredSize.width - 10.0, floorf(CGRectGetMidY(cell.contentView.bounds) - desiredSize.height / 2.0)), desiredSize};
        amountLabel.frame = computedFrame;
        
        return cell;
}
 
// if the argument cell index path (section, row) is within the ingredient section, return that cell
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    if (indexPath.section == INGREDIENTS_SECTION) {
        return [self ingredientsCellAtIndex:indexPath.row forTableView:tableView];
    }
 
    static NSString *MyIdentifier = @"MyIdentifier";
    
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:MyIdentifier];
    if (cell == nil) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:MyIdentifier];
    }
    
    NSString *text = nil;
    switch (indexPath.section) {
        case INSTRUCTIONS_SECTION: // instructions
            cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
            text = @"Instructions";
            break;
        default:
            cell.accessoryType = UITableViewCellAccessoryNone;
            break;
    }
    
    if (text) {
        cell.textLabel.text = text;
    }
    return cell;
}
 
- (NSIndexPath *)tableView:(UITableView *)tableView willSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    // Don't allow ingredients to be selected
    NSInteger section = indexPath.section;
    if (section == INGREDIENTS_SECTION) {
        [tableView deselectRowAtIndexPath:indexPath animated:YES];
        return nil; 
    }
    return indexPath;
}
 
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    // If the intructions section is tapped, navigate to the instructions view controller
    if (indexPath.section == INSTRUCTIONS_SECTION) {
        InstructionsViewController *nextViewController = [[InstructionsViewController alloc] initWithNibName:@"RecipeInstructionsView" bundle:nil];
        // pass the recipe to the instructions view controller
        ((InstructionsViewController *)nextViewController).recipe = _recipe;
        [self.navigationController pushViewController:nextViewController animated:YES];
    }
}
 
// Touch handler for tapping the photo in the header view. 
- (IBAction)showPhoto {
    // Navigate to the recipe photo view controller to show a large photo for the recipe.
    RecipePhotoViewController *recipePhotoViewController = [[RecipePhotoViewController alloc] init];
    recipePhotoViewController.recipe = _recipe;
    [self.navigationController pushViewController:recipePhotoViewController animated:YES];
}
 
@end