This project is from iOS SDK Programming by Chris Adamson and Bill Dudney. Beta 2.

This is the introduction to the Recipe application. Chapter 4 sets up the basic application and illustrates the MVC pattern.

Topics

• application:didFinishLaunchingWithOptions:

• Sizing images

  You want to size your images to the placeholder you setup in the application. Having iPhone or iPad do the resizing can drain battery faster.

• didRecieveMemoryWarning

• viewDidUnload

Version tag is v1.0

Tables: style property defines one of two types

• plain Cells with optional header
• grouped Cells indented with rounded ends caps on top level cells.

There is a nice quick section on how cells are reused to keep memory usage down. Here is a gist that shows the basic pattern. There is an identifier, Cell, that is added to each UITableViewCell created. Once a cell rolls off the screen it becomes available for reuse.

Gist

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"Cell";
    
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        cell = [[UITableViewCell alloc] 
               initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
    }
    
    if (cell == nil) {
        cell = [[UITableViewCell alloc] 
               initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
    }
    cell.textLabel.text = [[self.dataSource recipeAtIndex:indexPath.row] title];
    return cell;
}

Datasource added to application mainly to extend application so we could delete items from the table. The app started with an immutable array holding recipes. The datasource did more than allowing delete. It provided a clean separation between the model and the controller. The datasource takes care of things like initializing the data and answers questions the table controller needs to know like the number of items.

Version tag is v2.0

Version tags where not showing up on github. I had to use

git push --tags

to get the tags to show up.

The accepted style now is to add an underscore to the ivar name in the @synthesize statement. The was confirmed by the authors of the book and they site that even in Apple's templates you will see this convention followed. In the book they slack off so I asked the question.

Gist

@synthesize recipes = _recipes;	 

- (NSArray *)recipes {
    if(nil == _recipes) {
     // create the recipes
    }
    return _recipes;
}

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